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| Aflatoxin contamination of maize and groundnut in Burundi: distribution of contamination, identification of causal agents and potential biocontrol genotypes of Aspergillus flavus, Nsabiyumva, G.*, Mutegi, C., Wagacha, M.*, Mohamed, A. B., Njeru, N. K.*, Ndayihanzamaso, P.*, Niyuhire, C.*, Atehnkeng, J., Njukwe, E., Callicott, K., Cotty, P., Ortega-Beltran, A. and Bandyopadhyay, R., in: Frontiers in Microbiology, volume 14, number -: 1106543, pages 1-13, ISSN 1664-302X, 2023. [DOI] |
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| Antioxidant, starch-digesting enzymes inhibitory, and pasting properties of elite yellow-fleshed cassava genotypes, Kareem, B., Irondi, E. A.*, Alamu, E. O., Ajani, E. O.*, Abass, A., Parkes, E. and Maziya-Dixon, B., in: Frontiers in Sustainable Food Systems, volume 7, number : 1129807, pages 1-11, ISSN 2571-581X, 2023. [DOI] |
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| Assessment of chemical properties of yellow-fleshed cassava (Manihot esculenta) roots as affected by genotypes and growing environments, Alamu, E. O., Maziya-Dixon, B., Lawal, O.* and Dixon, A., in: AGRIVITA Journal of Agricultural Science, volume 43, number 2, pages 409-421, ISSN 0126-0537, 2021. [DOI] |
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| Assessment of functional and pasting properties of fresh orange maize hybrids and open-pollinated varieties as influenced by genotype, harvesting time, and growing location, Alamu, E. O., Maziya-Dixon, B., Menkir, A., Adesokan, M. and Olaofe, O.*, in: Frontiers in Nutrition, volume 8, number -: 757728, pages 1-10, ISSN 2296-861X, 2021. [DOI] |
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| Beta-carotene micellarization during in vitro digestion and uptake by caco-2 cells is directly proportional to beta-carotene content in different genotypes of cassava, Thakkar, S. K., Maziya-Dixon, B., Dixon, A. and Failla, M. L., in: Journal of Nutrition, volume 137, number 10, pages 2229-2233, 2007. |
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| Bioactive composition and free radical scavenging activity of fresh orange maize hybrids: impacts of genotype, maturity stages, and processing methods, Alamu, E. O., Maziya-Dixon, B., Menkir, A., Irondi, E. A.* and Olaofe, O.*, in: Frontiers in Nutrition, volume 8, number : 640563, pages 1-10, ISSN 2296-861X, 2021. [DOI] |
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| Bread from composite cassava-wheat flour. II: effect of cassava genotype and nitrogen fertilizer on bread quality, Shittu, T.*, Dixon, A., Awonorin, S.*, Sanni, L. and Maziya-Dixon, B., in: Food Research International, volume 41, number 6, pages 569-578, ISSN 0963-9969, 2008. [DOI] |
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| Breeding new sweetpotato genotypes combining elevated content of two antagonistic traits of high dry matter and beta-carotene content in a high root yield background, Afuape, S. O.*, Tongoona, P.*, Asante, I.*, Egesi, C., Nwaigwe, G.* and Offei, S.*, in: Euphytica, volume 215, number -: 211, pages 1-13, ISSN 0014-2336, 2019. [DOI] |
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| Carotenoid retention in ogi flour made from different provitamin a maize genotype (pVAC) and yellow maize, Akinsola, O.*, Otegbayo, B.*, Alamu, E. O. and Maziya-Dixon, B., Abstract presented at IARSAF 22nd Annual Symposium: Innovative Agricultural Research for food security and climate change mitigation in sub-Saharan Africa", on Monday 20th - Friday 24 May, IITA Conference Center, Ibadan, Nigeria, 2019. |
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| Carotenoids content of yellow-fleshed cassava genotypes grown in four agroecological zones in Nigeria and their Retinol Activity Equivalents (RAE), Maziya-Dixon, B. and Dixon, A., in: Journal of Food, Agriculture & Environment, volume 13, number 2, pages 63-69, ISSN 1459-0255, 2015. |
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| CERES-Maize model for simulating genotype-by-environment interaction of maize and its stability in the dry and wet savannas of Nigeria, Adnan, A. A.*, Diels, J ., Jibrin, J. M.*, Kamara, A., Shaibu, A. S.*, Craufurd, P. and Menkir, A., in: Field Crops Research, volume 253, number -: 107826, pages 1-11, ISSN 0378-4290, 2020. [DOI] |
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| Changes in the rhizosphere and root-associated bacteria community of white Guinea yam (Dioscorea rotundata Poir.) impacted by genotype and nitrogen fertilization, Idowu, A. P., Yamamoto, K., Koizumi, T., Matsutani, M., Takada, K., Shiwa, Y., Asfaw, A., Matsumoto, R., Ouyabe, M., Pachakkil, B., Kikuno, H. and Shiwachi, H., in: Heliyon, volume 10, number -: e33169, pages 1-15, ISSN 2405-8440, 2024. [DOI] |
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| Characterization of macro and micro-minerals in cassava leaves from genotypes planted in three different agroecological locations in Nigeria, Alamu, E. O., Dixon, A., Eyinla, T. and Maziya-Dixon, B., in: Heliyon, volume 8, number 11: e11618, pages 1-18, ISSN 2405-8440, 2022. [DOI] |
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| Colonization of resistant and susceptible maize genotypes by the pink stem borer, Sesamia calamistis (Lepidoptera: Noctuidae), Aroga, R. and Ajala, S., in: In Demand driven technologies for sustainable maize production in West and Central Africa, pages 257-270, WECAMAN; International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, 2007. |
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| Combining AMMI and BLUP analysis to select high-yielding soybean genotypes in Benin, Agoyi, E. E.*, Ahomondji, S. E.*, Yemadje, P. L.*, Ayi, S.*, Ranaivoson, L., Torres, T. M., da Fonseca Santos, M., Boulakia, S., Chigeza, G., Assogbadjo, A. E.*, Diers, B. and Sinsin, B.*, in: Agronomy Journal, volume 116, number 2, pages 2109-2128, ISSN 0002-1962, 2024. [DOI] |
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| Correlation and Path Analysis in Shallot (Allium cepa var. ascalonicum Baker.) Genotypes, Sendek, F., Tefera, H. and Tsadik, K. W., in: East African Journal of Sciences, volume 3, number 1, pages 55-60, ISSN 1992-0407, 2009. |
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| Criblage de genotypes de manioc (Manihot esculenta CRANTZ) pour la resistance a la cochenille Africaine de racines et tubercules (Stictococcus vayssierei Richard) dans differentes zones agro-ecologiques de Beni (Nord Kivu, RD Congo), Ndengo, N. E.*, Munseki, L.*, Hanna, R. and Ngbolua, K.*, in: International Journal of Innovation and Applied Studies, volume 16, number 1, pages 210-225, ISSN 2028-9324, 2016. |
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| Effect of seasonal drought on the agronomic performance of four banana genotypes (Musa spp.) in the east African highlands, Uwimana, B., Zorrilla-Fontanesi, Y., van Wesemael, J., Mduma, H., Brown, A., Carpentier, S. C. and Swennen, R., in: Agronomy, volume 11, number 1: 4, pages 1-23, ISSN 2073-4395, 2021. [DOI] |
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| Estimating the forage yield of 43 cassava mosaic disease (CMD)-resistant genotypes under three agroecologies of Nigeria, Aribisala, O., Akoroda, M., Okechukwu, R. and Ilona, P., in: Book of Abstracts of the 9th Triennial Symposium of the International Society for Tropical Root Crops-Africa Branch, 31 October-5 November 2004, Mombasa, Kenya, 2004. |
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| Evaluation de nouvelles varieties d'igname en Cote d'Ivoire: bilan de trois annees d'experience avec des genotypes ameliores par l'IITA, Ettien, J. B., Tschannen, A. B., Nindjin, C., Asiedu, R., Assa, A. and Girardin, O., in: Atelier national sur le developpement durable de la production et de la consommation de l'igname en Cote d'Ivoire. Abidjan, October 23-26. Association Ivoirienne des Sciences Agronomique (AISA), pages 109-116, 2003. |
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| Evaluation of advanced cassava genotypes in Uganda, Ntawuruhunga, P., Ssemakula, G., Ojulong, H., Bua, A.*, Ragama, P., Kanobe, C. and Whyte, J., in: African Crop Science Journal, volume 14, number 1, pages 17-25, 2006. |
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| Evaluation of cowpea genotypes for their reactions to Striga gesnerioides in the dry savanna of northeast Nigeria, Omoigui, L., Kamara, A., Massawe, F., Ishiyaku, M.*, Boukar, O., Alabi, S.* and Ekeleme, F., in: African Crop Science Conference Proceedings, pages 273-278, African Crop Science Society, 2007. |
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| Evaluation of cowpea genotypes for variations in their contribution of N and P to subsequent maize crop in three agro-ecological zones of West Africa, Abaidoo, R., Okogun, J., Kolawole, G., Diels, J ., Randall, P. and Sanginga, N., pages 401-412, Springer, ISBN 978-1-4020-5759-5, 2007. |
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| Evaluation of improved cassava genotypes for yield and related traits for a better breeding strategy under different agroecologies in Nigeria, Adetoro, N. A., Oworu, O. O.*, Nassir, A. L.*, Bello, A. A., Parkes, E., Ogunbayo, S. A., Akinwale, M. G., Aina, O., Agbona, A ., Iluebbey, P., Sanni, L., Maziya-Dixon, B., Dixon, A. and Kulakow, P., in: Euphytica, volume 217, number : 73, pages 1-19, ISSN 0014-2336, 2021. [DOI] |
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| Evaluation of maize (Zea mays L.) genotypes as a component of integrated stem borer (Chilo partellus Swinhoe) management in coastal region of Kenya, Ajala, S., Nour, A. M., Ampong-Nyarko, K. and Odindo, M. O., in: African Journal of Agricultural Research, volume 5, number 8, pages 758-763, ISSN 1991-637X, 2010. |
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| Evaluation of maize genotypes derived from carotenoid cleavage dioxygenase 8 (CCD8) mutant production no strigolactone, Ilesanmi, O. J.*, Federal University of Agriculture, 2021. |
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| Evaluation of new cassava genotypes (Euphorbiaceae) for carotenoids content, yield components and reaction to pests and diseases across agro-ecological zones in Cameroon, Tize, I.*, The University of Ngaoundere, 2023. |
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| Evaluation of new hybrid and farmer genotypes on processor productivity, workload and related drudgery: focus on women cassava processors, Bello, A. A., Olaosebikan, O., Okoye, B.*, Madu, T.*, Bouniol, A., Dufour, D., Adinsi, L.*, Rabbi, I. Y. and Teeken, B., International Institute of Tropical Agriculture, 2023. |
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| Evaluation of promiscuous soybean genotypes at Chitedze, Malawi, Tefera, H., Kanaji, G.*, Boahen, S. and Chikoye, D., Abstract presented at ASA-CSSA-SSSA 2010 International Annual Meeting October 31-November 4, Long Beach, CA, (published online), 2010. |
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| Evaluation of proximate composition and pasting properties of high quality cassava flour (HQCF) from cassava genotypes (Manihot esculenta Crantz) of B-carotene-enriched roots, Alamu, E. O., Maziya-Dixon, B. and Dixon, A., in: LWT - Food Science and Technology, volume 86, pages 501-506, ISSN 0023-6438, 2017. [DOI] |
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| Evaluation of water yam (Dioscorea alata L.) genotypes for reaction to yam anthracnose disease, Ogunyemi, S. and Asiedu, R., in: 9th Triennial Symposium of the Internaitonal Society for Tropical Root Crops-Africa Branch (ISTRC-AB); October 31 to November 5, 2004, Mombasa, Kenya, 2004. |
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| Evaluation of wheat genotypes for heat stress tolerance and identification of early stress indicators, Chileshe, P.*, Chikuta, S.*, Lungu, D.*, Kamfwa, K.* and Omondi, J. O., in: Plant Physiology Reports, pages 1-13, ISSN 2662-253X, 2023. [DOI] |
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| Exploring genotype by environment interaction on cassava yield and yield related traits using classical statistical methods, Bakare, M. A., Kayondo, S. I., Aghogho, C. I., Wolfe, M., Parkes, E., Kulakow, P., Egesi, C., Rabbi, I. Y. and Jannink, J., in: PloS ONE, volume 17, number 7: e0268189, pages 1-24, ISSN 1932-6203, 2022. [DOI] |
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| Field evaluation of peanut genotypes for resistance to Sclerotinia blight, Akem, C., Melouk, H. A. and Smith, O. D., in: Crop Protection, volume 11, number 4, pages 345-348, 1992. |
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| Field evaluation of selected cassava genotypes for cassava brown streak disease based on symptom expression and virus load, Kaweesi, T.*, Kawuki, R. S.*, Kyaligonza, V.*, Baguma, Y.*, Tusiime, G.* and Ferguson, M., in: Virology Journal, volume 11, number 216, pages 1-14, ISSN 1743-422X, 2014. |
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| Gas chromatography-mass spectrometry and single nucleotide polymorphism genotype by sequencing analyses reveal the bean chemical profiles and relatedness of Coffea canephora genotypes in Nigeria, Anagbogu, C. F.*, Ilori, C. O.*, Bhattacharjee, R., Olaniyi, O. O.* and Beckles, D. M., in: Plants, volume 8, number -: 425, pages 1-17, ISSN 2223-7747, 2019. [DOI] |
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| Genetic characterization of cassava (Manihot esculenta Crantz) genotypes using agro-morphological and single nucleotide polymorphism markers, Karim, K. Y.*, Ifie, B. E.*, Dzidzienyo, D.*, Danquah, E.*, Blay, E.*, Whyte, J., Kulakow, P., Rabbi, I. Y., Parkes, E., Omoigui, L., Norman, P. E.* and Iluebbey, P., in: Physiology and Molecular Biology of Plants, volume 26, number 2, pages 317-330, ISSN 0971-5894, 2020. [DOI] |
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| Genetic diversity and population structure analysis of soybean [Glycine max (L.) Merrill] genotypes using agro-morphological traits and SNP markers, Chiemeke, F. K.*, Olasanmi, B.*, Agre, A. P., Mushoriwa, H ., Chigeza, G. and Abebe, A. T., in: Genes, volume 15, number 11: 1373, pages 1-16, ISSN 2073-4425, 2024. [DOI] |
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| Genetic gains from 30 years of cassava breeding in Nigeria for storage root yield and disease resistance in elite cassava genotypes, Okechukwu, R. and Dixon, A., in: Journal of Crop Improvement, volume 22, number 2, pages 181-208, 2008. |
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| Genetic transformation of cassava - independent of genotype, Jorgensen, K., Ingelbrecht, I., Jensen, S., Olsen, E., Sorensen, C., Kannangara, R. and Moller, B., 2008. |
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| Genetic variability and genotype by environment interaction of two major cassava processed products in multi-environments, Aghogho, C. I., Eleblu, J. S. Y.*, Bakare, M. A., Kayondo, S. I., Asante, I.*, Parkes, E., Kulakow, P., Offei, S.* and Rabbi, I. Y., in: Frontiers in Plant Science, volume 13, number -: 974795, pages 1-17, ISSN 1664-462X, 2022. [DOI] |
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| Genetic Variability Studies in Ethiopian Shallot (Allium cepa L. var. ascalonicum Backer) Genotypes, Sendek, F., Tefera, H. and Tsadik, K. W., in: East African Journal of Sciences, volume 2, number 2, pages 130-134, ISSN 1992-0407, 2009. |
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| Genetic variation and genotype X environment interaction for yield and other agronomic traits in cassava in Nigeria, Egesi, C. N.*, Ilona, P., Ogbe, F., Akoroda, M. and Dixon, A., in: Agronomy Journal, volume 99, pages 1137-1142, ISSN 0002-1962, 2007. [DOI] |
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| Genetic variation for total carotene, iron, and zinc contenet in maize genotypes and cassava clones, Maziya-Dixon, B., Kling, J., Menkir, A. and Dixon, A., in: Food and Nutrition Bulletin, volume 21, number 4, pages 419-422, 2000. |
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| Genomic prediction in a multiploid crop: genotype by environment interaction and allele dosage effects on predictive ability in banana, Nyine, M., Uwimana, B., Blavet, N., Hřibová, E., Vanrespaille, H., Batte, M., Akech, V., Brown, A., Lorenzen, J., Swennen, R. and Doležel, J., in: Plant Genome, volume 11, number 2:170090, pages 1-16, ISSN 1940-3372, 2018. [DOI] |
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| Genotype by environment cultivar evaluation for cassava brown streak disease resistance in Tanzania, Shirima, R. R., Legg, J., Maeda, D. G.*, Tumwegamire, S., Mkamilo, G., Mtunda, K.*, Kulembeka, H.*, Ndyetabula, I.*, Kimata, B.*, Matondo, D. G.*, Ceasar, G., Mushi, E., Sichalwe, K.* and Kanju, E., in: Virus Research, volume 286, number -: 198017, pages 1-12, ISSN 0168-1702, 2020. [DOI] |
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| Genotype by environment effects on promiscuous nodulation in soybean (Glycine max L. Merrill), Agoyi, E. E.*, Odong, T. L.*, Tumuhairwe, J. B.*, Chigeza, G., Diers, B. W. and Tukamuhabwa, P.*, in: Agriculture & Food Security, volume 6, number 29, pages 1-14, ISSN 2048-7010, 2017. [DOI] |
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| Genotype by environment interaction and productivity of new generation cassava genotypes developed for food and industrial uses in Nigeria, Kulakow, P., Aina, O., Parkes, E., Yomeni, M. O., Onyeka, J.*, Olasanmi, B.*, Iluebbey, P., Agbona, A . and Dixon, A.*, Abstract, P. 225 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
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| Genotype by environment interaction effect and fresh root yield stability of cassava genotypes under contrasting nitrogen regimes, Mbe, J. O.*, Dzidzienyo, D.*, Abah, S. P.*, Njoku, D. N., Aghogho, C. I., Onyeka, J., Tongoona, P.* and Egesi, C., in: Scientific Reports, pages 1-17, ISSN 2045-2322, 2024. [DOI] |
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| Genotype by environment interaction effect on beta-carotene of yellow root cassava (Manihot esculenta Crantz) genotypes in Ghana, Maroya, N., Asante, I.* and Dixon, A.*, in: Tropical Roots and Tuber Crops and the Challenges of Globalization and Climate Changes. Proceedings of the 11th triennial Symposium of the ISTRC-AB, 4 to 8 October 2010, pages 212-224, ISTRC-AB, Ibadan, Nigeria, 2012. |
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| Genotype by environment interaction for native cassava(Manihot esculenta Crantz) starch quality and its use in the commercial sector, Benesi, I.*, Labuschagne, M.*, Dixon, A., Viljeon, C. and Mahungu, N., in: Proceedings of the 13th ISTRC-Govt symposium, pages 144-157, Arusha, Tanzania, 2007. |
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| Genotype by environment interaction on resistance to cassava green mite associated traits and effects on yield performance of cassava genotypes in Nigeria, Jiwuba, L.*, Danquah, A.*, Asante, I.*, Blay, E.*, Onyeka, J.*, Danquah, E.* and Egesi, C., in: Frontiers in Plant Science, volume 11, number -: 572200, pages 1-13, ISSN 1664-462X, 2020. [DOI] |
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| Genotype environment interaction studies with cassava, Otoo, J., Dixon, A., Asiedu, R., Okeke, J. E., Maroya, N., Tougnon, K., Okoli, O., Tetteh, J. P. and Hahn, S. K., in: Tropical root crops in a developing economy: proceedings of the 9th Symposium of the International Society for Tropical Root Crops, 10-16 October 1991, Accra, Ghana, pages 146-148, International Society for Tropical Root Crops, 1994. |
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| Genotype stability for total carotenoid concentration in yellow-fleshed cassava, Dixon, A., Ssemakula, G. and Maziya-Dixon, B., in: Root and tuber crops for poverty alleviation through science and technology for sustainable development: proceedings of the 10th symposium of ISTRC-AB held from 8-12 October, 2007 in Maputo, Mozambique, pages 362-363, ISTRC-AB, 2010. |
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| Genotype x environment effects on cassava response to the green mite (Mononychellus tanajoa), Nukenine, E.*, Dixon, A. and Ngeve, J., in: African Journal of Root and Tuber Crops, volume 5, number 1, pages 3-8, ISSN 1118-2075, 2002. |
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| Genotype x environment effects on severity of cassava bacterial blight disease caused by Xanthomonas axonopodis pv. manihotis, Dixon, A., Ngeve, J. and Nukenine, E., in: European Journal of Plant Pathology, volume 108, number 8, pages 763-770, 2002. |
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| Genotype x environment interaction analysis of soybean (Glycine max (L.) Merrill) grain yield across production environments in southern Africa, Mwiinga, B., Sibiya, J.*, Kondwakwenda, A.*, Musvosvi, C.* and Chigeza, G., in: Field Crops Research, volume 256, number -: 107922, pages 1-7, ISSN 0378-4290, 2020. [DOI] |
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| Genotype X environment interaction and stability analysis in upland rice (Oryza sativa L.) varieties in Ethiopia, Abebe, D.*, Mohammed, W.* and Abebe, A. T., in: Journal of Crop Science and Biotechnology, volume 26, pages 51-62, ISSN 1975-9479, 2023. [DOI] |
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| Genotype x environment interaction and yield stability of soybean (Glycine max l.) genotypes in multi-environment trials (METs) in Nigeria, Abebe, A. T., Adewumi, A. S., Adebayo, M. A.*, Shaahu, A.*, Mushoriwa, H ., Alabi, T. R., Derera, J., Agbona, A . and Chigeza, G., in: Heliyon, volume 10, number -: e38097, pages 1-15, ISSN 2405-8440, 2024. [DOI] |
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| Genotype x environment interaction effects on native cassava starch quality and potential for starch use in the commercial sector, Benesi, I.*, Labuschagne, M.*, Dixon, A. and Mahungu, N., in: African Crop Science Journal, volume 12, number 3, pages 205-216, 2004. |
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| Genotype x environment interaction in multilocational testing of Musa germplasm, Pillay, M., Tenkouano, A., Hartman, J., Vuylsteke, D. and Ortiz, R., in: Paper presented at: 6th Biennial Conference of the African Crop Science Society; 12-17 October, Nairobi, Kenya, 2003. |
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| Genotype x environment interaction in water yam (Dioscorea alata) yield trials in five yam-growing sites in Nigeria, Egesi, C. N.*, Ogunyemi, S. and Asiedu, R., in: Journal of Genetics and Breeding, volume 59, pages 81-88, 2005. |
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| Genotype X Environment interaction of carotene content of yellow-fleshed cassava genotypes in Nigeria, Maroya, N., Kulakow, P., Dixon, A.*, Maziya-Dixon, B. and Bakare, M. A., in: Journal of Life Sciences, volume 6, number 6, pages 595-601, ISSN 1934-7391, 2012. |
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| Genotype X Environment interaction of mosaic disease, root yields and total carotene concentration of yellow-fleshed cassava in Nigeria, Maroya, N., Kulakow, P., Dixon, A.* and Maziya-Dixon, B., in: International Journal of Agronomy, volume 2012, number ID 434675, pages 1-8, ISSN 1687-8159, 2012. [DOI] |
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| Genotype X environment interactions for east African orange-fleshed sweetpotato clones evaluated across varying ecogeographic conditions in Uganda, Tumwegamire, S., Rubaihayo, P.*, Gruneberg, W. J., LaBonte, D. R., Mwanga, R. O. and Kapinga, R ., in: Crop Science, volume 56, pages 1628-1644, ISSN 0011-183X, 2016. [DOI] |
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| Variability and grain yield potential of pearl millet (Pennisetum glaucum (L) R. Br.) genotypes under irrigated conditions in the Sudan, Ishaq, J.* and Meseka, S. K., in: Canadian Journal of Plant Breeding, volume 2, number 2, pages 76-79, ISSN 2291-6342, 2014. |
|
| Variability in agricultural and biological yields of ten musa genotypes evaluated for two cropping cycles in a sub-humid environment of Nigeria, Baiyeri, K. and Tenkouano, A., in: Journal of Crop Improvement, volume 21, number 1, pages 27-40, ISSN 1542-7528, 2008. |
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| Variation among cassava (Manihot esculenta Crantz) genotypes for storage root yield, yield components and response to cassava mosaic disease at the advanced breeding stage, Mahamane, A. O.*, Olasanmi, B.*, Udemba, I. O.* and Mbanjo, E., in: Journal of Applied and Natural Science, volume 16, number 2, pages 922-927, ISSN 0974-9411, 2024. [DOI] |
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| Variation among cowpea genotypes in sensitivity of transpiration rate and symbiotic nitrogen fixation to soil drying, Sinclair, T. R., Manandhar, A., Belko, N., Rair, M., Vadez, V. and Roberts, P. A., in: Crop Science, volume 55, pages 2270-2275, ISSN 0011-183X, 2015. [DOI] |
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| Variation in nutrient and antinutrient contents of tubers from yellow yam (Dioscorea cayenensis) genotypes grown at two locations, Akin-Idowu, P., Odunola, O.*, Asiedu, R., Maziya-Dixon, B. and Uwaifo, A. O.*, in: Journal of Food, Agriculture and Environment, volume 6, number 3-4, pages 95-100, ISSN 1459-0255, 2008. |
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| Variation in tuber dry matter content and starch pasting properties of white Guinea yam (Dioscorea rotundata) genotypes grown in three groecologies of NIGERIA, Matsumoto, R., Asfaw, A., De Koeyer, D., Muranaka, S., Yoshihashi, T., Ishikawa, H., Adebola, P. O. and Asiedu, R., in: Agronomy, volume 11, number 10: 1944, pages 1-15, ISSN 2073-4395, 2021. [DOI] |
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| Variations in micronutrient concentrations and retentions in fufu made from yellow-fleshed cassava as a function of genotype and processing methods, Williams-Ngegba, M. S. E.*, Onabanjo, O. O.*, Anthony, N. M.*, Alamu, E. O., Maziya-Dixon, B. and Oguntona, E. B.*, in: Frontiers in Nutrition, volume 11, number -: 1295609, pages 1-12, ISSN 2296-861X, 2024. [DOI] |
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| Variations of macro- and microelements in yellow-fleshed cassava (Manihot esculenta Crantz) genotypes as a function of storage root portion, harvesting time, and sampling method, Alamu, E. O., Maziya-Dixon, B., Sibeso, C., Parkes, E. and Dixon, A., in: Applied Sciences, volume 10, number 16: 5396, pages 1-19, ISSN 2076-3417, 2020. [DOI] |
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| Whitefly Bemisia tabaci (Homoptera: Aleyrodidae) infestation on cassava genotypes grown at different ecozones in Nigeria, Ariyo, O., Dixon, A. and Atiri, G.*, in: Journal of Economic Entomology, volume 98, number 2, pages 611-617, ISSN 0022-0493, 2005. |
|
| Yield and N-use efficiency of five tropical maize genotypes under different N levels in the moist savanna of Nigeria, Oikeh, S., Kling, J., Horst, W. J. and Chude, V.*, in: Maize productivity gains through research and technology dissemination: proceedings, 5th Eastern and Southern Africa Regional Maize Conference, 3-7 June 1996, Arusha, Tanzania, CIMMYT, 1997. |
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| Yield components of triploid and tetraploid Musa genotypes in Nigeria, Baiyeri, K., Mbah, B.* and Tenkouano, A., in: HortScience, volume 35, number 7, pages 1338-1343, 2000. |
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| Yield performance and stability analysis of promising soybean genotypes under contrasting environments in the semi-arid zone of Sudan, Ngalamu, T.*, Bulli, P.* and Meseka, S. K., in: Legume Research, pages 1-8, ISSN 0250-5371, 2023. [DOI] |
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| Environmental stability of resistance to anthracnose and virus diseases of water yam (Dioscorea alata), Egesi, C. N.*, Onyeka, T. J.* and Asiedu, R., in: African Journal of Agricultural Research, volume 4, number 2, pages 113-118, ISSN 1991-637X, 2009. |
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| Keywords: | Colletotrichum gloeosporioides; genotype x environment (G x E) interaction; stable resistance; water yam; yam anthracnose; yam mosaic virus
|
|
| Field evaluation of IITA improved cowpea (Vigna unguiculata L.) lines for yield potential and stability in different environments and locations, Asiwe, J. A. N.* and Ajeigbe, H., Abstract (Poster) in Program and Book of Abstracts of the 5th World Cowpea Research Conference, held at Palm Beach Hotel, Saly, Senegal. 27 September - 1 October, 2010. |
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| Keywords: | fodder, genotype, grain yeild, Vigna unguiculata
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|
| GGE biplot analysis of Dioscorea rotundata cultivar tela genotypes in Ghana, Otoo, E.* and Asiedu, R., in: Journal of Food, Agriculture and Environment, volume 7, number 1, pages 134-139, ISSN 1459-0255, 2009. |
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| Keywords: | D. rotundata; agroecologies; genotypes; genotype x environment interaction
|
|
| The performance profile of Dioscorea rotundata cultivar Dorban genotypes in Ghana using GGE biplot analysis, Otoo, E.* and Asiedu, R., in: Journal of Food, Agriculture and Environment, volume 7, number 1, pages 150-155, ISSN 1459-0255, 2009. |
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| Keywords: | D. rotundata; genotypes; genotype x environment interaction
|
|
| Variability and grain yield potential of pearl millet (Pennisetum glaucum (L) R. Br.) genotypes under irrigated conditions in the Sudan, Ishaq, J.* and Meseka, S. K., in: Canadian Journal of Plant Breeding, volume 2, number 2, pages 76-79, ISSN 2291-6342, 2014. |
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| Keywords: | Pennisetum glaucum, Genotypes, heritability, yields, Sudan
|
|
| Criblage de genotypes de manioc (Manihot esculenta CRANTZ) pour la resistance a la cochenille Africaine de racines et tubercules (Stictococcus vayssierei Richard) dans differentes zones agro-ecologiques de Beni (Nord Kivu, RD Congo), Ndengo, N. E.*, Munseki, L.*, Hanna, R. and Ngbolua, K.*, in: International Journal of Innovation and Applied Studies, volume 16, number 1, pages 210-225, ISSN 2028-9324, 2016. |
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| Breeding soybeans for the tropics capable of nodulating effectively with indigenous Rhizobium spp., Kueneman, E., Root, W. R., Dashiell, K. and Hohenberg, J., in: Plant and Soil, volume 82, number 3, pages 387-396, 1984. [DOI] |
|
Abstract:
Most soybean varieties fail to nodulate effectively in tropical soils unless inoculated with a competitive strain of Rhizobium japonicum. Developing countries in the tropics, with few exceptions, lack inoculant industries to produce and distribute viable inoculants to small farmers and extension programs to teach them to use inoculant. Several soybean genotypes have been identified that nodulate effectively with many strains of the cowpea inoculation group which is ubiquitous in tropical soils of Africa. Soybean genotypes that nodulate and grow well without inoculant application are called promiscuous. Methodologies for incorporation of the promiscuity character into high-yielding backgrounds are discussed.
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| Cassava improvement in sub-Saharan Africa: contributions of IITA and its partners, Dixon, A., Okechukwu, R., Ssemakula, G., Hanna, R., Thresh, J. M., Hughes, J., Ingelbrecht, I., Fregene, M.*, Legg, J., Mahungu, N., Nweke, F., Ntawuruhunga, P., Fauquet, C., Manyong, V., Neuenschwander, P., Whyte, J., Wydra, K., Asiedu, R., Egesi, C. N.*, Bandyopadhyay, R., Winter, S., Tarawali, G., Bokanga, M., Ezedinma, C., Sanni, L., Ferguson, M., Ogbe, F., Akoroda, M., Maziya-Dixon, B., Ilona, P., Ekanayake, I. J., Ariyo, O., Onyeka, J.*, Otim-Nape, G.*, Dahniya, M. T., Ortiz, R., Hahn, S. K. and Hartmann, P., 2008. |
|
Abstract:
Cassava improvement in sub-Saharan Africa: contributions of IITA and its partners
Dixon, A.G.O., R.U. Okechukwu, G. Ssemakula, R. Hanna, J.M. Thresh, J.d'A. Hughes, I. Ingelbrecht, M. Fregene, J. Legg, N. Mahungu, F. Nweke, J.P. Legg, P. Ntawuruhunga, C. Fauquet, V. Manyong, P. Neuenschwander, J. Whyte, K. Wydra, R. Asiedu, C.N. Egesi, R. Bandyopadhyay, S. Winter, G. Tarawali, M. Bokanga, C. Ezedinma, L. Sanni, M. Ferguson, F.O. Ogbe, M. Akoroda, B. Maziya-Dixon, P. Ilona, I.J. Ekanayake, O. Ariyo, J. Onyeka, G.W. Otim-Nape, M.T. Dahniya, R. Ortiz, S.K. Hahn and P. Hartmann
Cassava is well recognized for its capacity to address food needs of vulnerable communities in unstable environments in SSA. IITA and colleagues in African NARS, in collaboration with CIAT and ARIs have played leading roles in the development of improved cassava varieties which are disease and pest resistant, early maturing, and high yielding. Through a combination of conventional and new approaches, over 400 cassava genotypes have been developed. The characteristics of the new generation of cassava germplasm broke what had been an apparent yield barrier in cassava improvement increasing yields in many locations by at least 50-100% without the use of fertilizer. The improved germplasm is shared with NARS within the region as specific genotypes or improved seed populations for evaluation and selection under local conditions. Improvement programs in Africa that received these materials have tested them under local conditions, selected varieties that outperform local varieties, and released them to farmers in virtually every major cassava producing country. Today, about 30% of the area cropped with cassava in Africa is planted with improved varieties. Without the introduction of more productive cultivars with multiple diseases and pest resistance, the effective biological control of the cassava mealybug and, to a certain extent, of the green mite, cassava production in SSA would be 50% or less of what it is today. That translates to over 13 million tons of dry cassava/year, enough to meet the calorie requirements of 65 million people. The significant gains in the crop's output in farmers' fields are not only contributing to the African diet but also propelling commercialization of the crop. This paper highlights contributions to cassava improvement in SSA since 1970 by IITA and its partners, and suggests areas needing strengthening in the drive to produce better crop varieties for different regions and enduses in Africa.
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| Characterisation of resistance in cassava against viruses causing cassava mosaic and cassava brown streak disease in Africa, Koerbler, M., Stein, B., Ingelbrecht, I., Dixon, A. and Winter, S., 2008. |
|
Abstract:
Cassava mosaic disease caused by diverse geminiviruses (CMG) and Cassava brown streak disease caused by cassava brown streak virus (CBSV), are key constraints to the cultivation of cassava in Sub-Sahara Africa. We have collected and characterised the diversity of the most prominent geminiviruses from all African cassava cultivation areas and Cassava brown streak viruses from East Africa, to use defined viruses for resistance studies in selected IITA cassava breeding lines and African land races. Virus infections were established in cassava by either graft inoculation with scions of virus infected plants or, by particle bombardment of cloned infectious viruses. Resistance against cassava mosaic geminiviruses was identified in several breeding lines e.g. TME 4, TMS 96/0529 and TMS 96/0160 responding with abortion of virus infections after virus introduction. Other genotypes, e.g. TMS 96/0304, became infected but recovered from symptoms but maintaining the infection status. When cassava clones were analysed for CBSV resistance, it became evident that geminivirus resistance was tightly correlated with susceptibility against CBSV. Geminivirus resistant cassava responded with often severe CBSV infections (e.g. TMS 96/0160) upon virus inoculation. Interestingly, cassava genotypes with an intermediate resistance, TMS 96/0304, initially became mixed infected with CBSV/CMG however subsequently aborting CMG, to establish single CBSV infections. Differential responses were also recorded for strains of CBSV. While CMG resistance in cassava was against all CMG, differential responses were observed in cassava inoculated with CBSV isolates obtained from Kenya and Mozambique. While the CMG susceptible cassava landrace TME 117 was resistant against CBSV from Kenya, it became infected with CBSV from Mozambique. Only the cassava genotype TMS/ 1089A revealed immunity against CMG and also did not establish infections with the CBSV isolates from diverse origins.
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| Fruit characteristics and ripening pattern of ten Musa genotypes in a sub-humid environment in Nigeria, Baiyeri, K. and Tenkouano, A., in: Fruits, volume 63, number 1, pages 3-9, 2008. |
|
Abstract:
Introduction. Conventional evaluation of Musa through multilocation trials has
often been carried out to ascertain the yield stability and ecological range of new varieties but, for prospective growers, it is equally important to know the fruit characteristics and ripening pattern of the genotypes. Indeed, fruit characteristics determine consumers' attitudes towards the new varieties, and the associated market value of these varieties. Materials and methods. The metric traits and ripening pattern of fruits from nine Musa hybrids and one local variety of plantain were evaluated during two cropping seasons in a sub-humid environment in Nigeria. Results. All the traits measured varied with the genotype, but cropping cycle influenced only fruit weight and days to complete senescence of fruits. The interaction between genotype and cropping cycle was significant on fruit weight, fruit length and days to attain four different ripening stages. Most genotypes had better values in the ratoon harvest than in the plant crop. Fruit length and shape of PITA 21 were comparable with those of the local check, but the index of edible proportion was highest in PITA 22. PITA 21 and PITA 26 had the longest green life and total shelf life. Conclusion. The genotypes evaluated in our study revealed different utilization potentials. Also, the better postharvest life of some of the hybrids and comparable metric traits with the local check suggested the high adoption potential of the hybrids.
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| Genetic transformation of cassava - independent of genotype, Jorgensen, K., Ingelbrecht, I., Jensen, S., Olsen, E., Sorensen, C., Kannangara, R. and Moller, B., 2008. |
|
Abstract:
Cassava is a vegetatively propagated crop and its improvement through conventional breeding is challenging due to its high heterozygosity and low fertility. As it has not been possible to solve all cassava's problems connected to agriculture and consumption by traditional breeding, another solution could be to use molecular breeding. Major deficits of cassava are low protein content in the tubers, rapid post-harvest tuber deterioration and high content of cyanogenic glucosides. Careful processing of cassava roots is required to remove the released hydrogen cyanide which can cause acute or chronic cyanide intoxication. Unfortunately, processing to remove hydrogen cyanide typically results in loss of protein, minerals, and vitamins. For successfull molecular breeding of cassava, a genotype-independent genetic transformation method is essential. So far it has only been possible to transform model lines which have limited agricultural importance. Here a regeneration and transformation method is presented which has been successfully applied to all African varieties tested so far with a transformation frequency ranging from 0.2% to 3.8%. The method is based on the procedure developed by Li et al. (1996). This method is among others now used to 1) produce acyanogenic cassava (J{\o}rgensen et al 2005), 2) improve the nutritional value in the tubers, 3) virus resistance. The improvement of the nutritional value is focused on increasing the protein content in the tubers in varieties with and without a naturally increased levels of pro-vitamin A.
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| Highly client-oriented breeding with farmer participation in the Ethiopian cereal tef (Eragrostis tef (Zucc.) Trotter), Tefera, H., Belay, G.*, Assefa, K.* and Metaferia, G.*, in: African Journal of Agricultural Research, volume 3, number 1, pages 022-028, 2008. |
|
Abstract:
This paper describes a highly client-oriented breeding applied to enhance the development and release of a tef (Eragrostis tef) variety with farmer participation in Ethiopia. The main features include; clear objective, target cross, early-stage researcher selection, multi-location yield trial, farmer on-station selection, judicious selection of few candidate varieties based on farmers' and researchers' selections,
farmer managed on-farm trials, and release through the existing formal procedure. In the application of this strategy, tef exemplifies a crop with local importance, a clear market-driven selection criterion (cash crop) and farmers have better judgment of the criterion than researchers. Using farmers' consistent selection of genotypes, in conjunction with the required quantifiable data, breeders were able to release a new tef variety named ''Quncho''. The new variety was not the highest yielder, but it
was higher in grain yield and better in seed-color quality (very white seed-color) than the long-time cultivated variety DZ-01-196 (Magna), which was used as quality check. Given the appropriate degree of client-orientation, the results also show how farmer participation and formal breeding programs complement each other so as to overcome the rather prohibitive variety release procedures based on
data from participatory breeding alone.
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| Identification and validation of EST-derived microsatellites for genome analyses of cassava (Manihot esculenta Crantz) and related taxa in the Euphorbiaceae, Raji, A., Kolade, O., Anderson, J., Ugwu, C. D., Gedil, M., Dixon, A. and Ingelbrecht, I., 2008. |
|
Abstract:
Using bioformatics tools, we identified 646 Simple Sequence Repeats (SSRs) in silico from a unigene set of 8,577 Expressed Sequence Tags (ESTs) in cassava for the development of genic microsatellite markers. A total of 346 primer pairs were designed. Of these, 96 primer pairs were tested for polymorphism among diverse, cultivated genotypes of cassava (M. esculenta) from Africa and South America and three wild species. The cassava array comprised landraces as well as elite lines, five of which have previously been used as parents of mapping populations. Ninety percent of the primers amplified DNA fragments. Candidate EST-SSRs were analyzed on high resolution agarose gels and on ABI 3100 Genetic Analyzer. The number of alleles ranged from 1 to 8 which is lower compared to microsatellites derived from genomic sources. Approximately 80% of the microsatellites detected only one or two alleles per accession indicating a low degree of duplicated loci, a surprising finding for a highly heterozygous species such as cassava. Several markers showed cross-genus amplification across castor bean (Ricinus communis) and leafy spurge (Euphorbia esula), thus showing transferability from cassava to other taxa of the Euphorbiaceae. This study provides an in-depth view of the frequency of microsatellites in the cassava transcriptome, demonstrates the successful development of genic SSRs, and also indicates that available EST and genomic resources of leafy spurge and castor bean can be utilized for microsatellite marker development in cassava.
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| Identifying aflatoxin resistance-related proteins/genes through proteomics and RNAi gene silencing, Chen, Z. Y., Brown, R., Guo, B. Z., Menkir, A. and Cleveland, T. E., in: Peanut Science, volume 36, number 1, pages 35-41, ISSN 0095-3679, 2009. |
|
Abstract:
Aflatoxins are carcinogenic secondary metabolites
produced mainly by Aspergillus flavus Link ex. Fries, and A. prarasiticus Speare during infection of susceptible crops, such as maize, cottonseed, peanuts and tree nuts. This paper will review research efforts in identifying aflatoxin resistance-related proteins/genes in maize. Similar strategies may be useful in peanut. For maize, although genotypes resistant to A. flavus infection or aflatoxin production have been identified, the incorporation of resistance into commercial lines has been slow due to the lack of selectable markers
and poor understanding of host resistance mechanisms. Recently, resistance-associated proteins (RAPs) were identified through proteomic comparison of constitutive protein profiles between
resistant and susceptible maize genotypes. These
proteins belong to three major groups based on
their peptide sequence homologies: storage proteins, stress-related proteins, and antifungal proteins. Preliminary characterization of some of
these RAPs suggest that they play a direct role in
host resistance, such as pathogenesis-related
protein 10 (PR10), or an indirect role, such as
glyoxalase I (GLX I), through enhancing the host
stress tolerance. To verify whether these RAPs
play a role in host resistance, RNA interference
(RNAi) gene silencing technique was used to
silence the expression of these genes in maize.
RNAi vectors (glx I RNAi and pr10 RNAi) were
constructed using Gateway technology, and then
transformed into immature maize embryos using
both bombardment and Agrobacterium infection.
The extent of gene silencing in transgenic callus
tissues ranged from 20% to over 99%. The RNAi
silenced transgenic maize seeds have also been
obtained from plants regenerated from Agrobacterium transformed callus lines. Kernel screen assay of the transgenic maize kernels demonstrated a significant increase in susceptibility to A. flavus colonization and aflatoxin production in
some of the silenced transgenic lines compared
with non-silenced control kernels, suggesting the
direct involvement of these two proteins in
aflatoxin resistance in maize.
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| Novel sources of resistance to Fusarium stalk rot of maize in tropical Africa, Afolabi, C., Ojiambo, P., Ekpo, E.*, Menkir, A. and Bandyopadhyay, R., in: Plant Disease, volume 92, number 5, pages 772-780, ISSN 0191-2917, 2008. |
|
Abstract:
Fusarium stalk rot is one of the most widespread and destructive diseases of maize, and deployment of resistant genotypes is one of the most effective strategies for controlling the disease. Fifty inbred lines and four checks from the breeding program of the International Institute of Tropical Agriculture were evaluated in field trials at Ikenne and Ibadan, Nigeria in 2003 and 2004 to identify new sources of resistance to stalk rot caused by Fusarium verticillioides. Evaluations were conducted under artificial inoculation and natural infection at Ibadan and Ikenne, respectively. Disease severity was recorded using a severity scale (SS) and direct estimation of stalk discoloration (SD). The two methods of disease assessment were compared and combined to classify genotypes into resistance groups using results from rank-sum analysis. In 2003, disease severity ranged from SS = 1 to 5 and SD = 1.3 to 33.8% at both locations. Both SS and SD were significantly (P < 0.01) higher in 2003 than in 2004 at the two locations. In both years, inbred lines significantly differed in SS (P < 0.02) and SD (P < 0.04) at Ibadan. Similarly, inbred lines significantly differed in SS (P < 0.04) and SD (P < 0.04) when genotypes were evaluated at Ikenne. Disease assessments based on SS and SD were significantly correlated (0.68 < r < 0.95, P < 0.01) in both years. Based on the results from rank-sum analysis, inbred lines were separated into highly resistant, resistant, moderately resistant, moderately susceptible, susceptible, and highly susceptible groups. At Ibadan, 6 (11.1%) and 8 (14.8%) were identified as highly resistant and resistant, respectively, whereas 11 (20.4%) were identified as resistant at Ikenne. Inbred lines 02C14609, 02C14643, 02C14654, and 02C14678 were consistently classified as either highly resistant or resistant to stalk rot across locations and years while the check genotypes were classified either as susceptible or moderately susceptible to stalk rot. These four inbred lines identified to have high levels of disease resistance may be used for breeding maize with resistance to Fusarium stalk rot.
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| Severity of anthracnose and virus diseases of water yam (dioscorea alata L.) in NIgeria I: effects of yam genotype and date of planting, Egesi, C. N.*, Onyeka, T. and Asiedu, R., in: Crop Protection, volume 26, number 8, pages 1259-1265, ISSN 0261-2194, 2007. |
|
Abstract:
Anthracnose and virus diseases exert devastating impacts on yam production in many tropical regions of the world where the crop contributes to food security and income generation. The complexities in their epidemiology necessitate the use of integrated approaches in their management. Six genotypes of Dioscorea alata, planted on six dates (March?August) in each of 1998 and 1999 in Ibadan, Nigeria, were evaluated to determine the effects of planting date and genotype on severity of the two diseases. The date of planting had a profound influence on anthracnose severity, contributing 72% of the observed variation due to combined effects of planting date, genotype and their interactions. In contrast, the genotype effect was most dominant with respect to virus severity, accounting for 85% of the total observed variation. Planting in August supported least anthracnose development while April and May plantings resulted in the least severity of virus diseases. While selection of planting time could be used to manage anthracnose disease, its application could be influenced by the prevailing weather conditions in a particular location. Two of the genotypes (TDa 291 and TDa 297) had low severity values for both diseases across the different planting dates. Availability of such sources of multiple disease resistance and appropriate choice of planting date would be very useful in integrated management of the two major yam diseases.
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| Sink competition and desuckering effects on field performance of triploid and tetraploid plantain genotypes, Tenkouano, A., Vuylsteke, D. and Swennen, R.+, in: Journal of Crop Improvement, volume 20, number 1/2, pages 31-51, 2007. [DOI] |
|
Abstract:
Reproductive growth in polyarchic Musa spp. varieties occurs by the simultaneous growth of several shoots, resulting in competitive inhibition of fruit development in the individual shoots, particularly under poor soil fertility conditions. Nine plantain genotypes were forced into single-culm growth by continuous sucker removal in the ratoon crop (RC). There were no significant differences among genotypes for days to flowering (DTF) and days to harvest (DTH) in the plant crop (PC), but significant differences occurred in RC for both traits. There was a negative correlation between degree of sucker growth in the PC and DTF or DTH in RC, indicating that early flowering and maturity in the RC occurred as a result of fast sucker development in the PC. Likewise, bunch weight in the RC was positively correlated with sucker growth in the previous crop. However, sucker growth appeared to compete against the development of the bunch in the PC, resulting in a significant reduction in fruit size but not fruit number. Desuckering significantly reduced DTF and DTH in the RC. Bunch weight and fruit size were significantly improved by sucker removal in the RC. Gains were highest for genotypes that normally produce multiple lateral shoots and lowest for those displaying a more hierarchical growth habit. Thus, sucker removal could be recommended as a crop management option for the polyarchic Musa genotypes.
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| Somatic embryogenesis and genetic transformation of African farmer-grown cassava genotypes that are susceptible to the Cassava Brown Streak Disease, Ingelbrecht, I., Raji, A., Oyelakin, O., Winter, S., Moller, B., Dixon, A. and Jorgensen, K., 2008. |
|
Abstract:
Cassava is one of the most important sources of carbohydrates for over 500 million people in the (sub)tropics. Cassava plays an important role in the food security of many developing nations, especially in sub-Saharan Africa (SSA). Cassava is highly heterozygous, genetically complex, and many varieties either do not flower or produce few seeds thus hampering conventional crop improvement. Several major constraints limit the production and utilization of cassava roots, including two viral diseases, the Cassava Brown Streak Disease (CBSD) and the Cassava Mosaic Disease (CMD), which are specific to SSA. Farmer-preferred landraces are often susceptible to CBSD and/or CMD. Genetic transformation of cassava could complement conventional breeding programs for CBSD and/or CMD resistance. Current protocols for genetic transformation of cassava are limited to model genotypes which are not used by farmers of breeders in SSA. Since transformation protocols are genotype-dependent, suitable procedures for genetic modification of the landraces need to be developed. We have established somatic embryogenesis and organogenesis for three farmer/breeder-preferred varieties, two from East Africa (cv Kibaha and cv Albert) and one from West Africa (TME12) which are susceptible to CBSD. Primary and cyclical somatic embryogenesis was established for the three varieties. Cotyledon tissues from somatic embryos were used as source explants for Agrobacterium-mediated genetic transformation. Using an intron-interrupted {\^a}{\"i}¿½glucuronidase reporter gene construct under control of the Cassava vein mosaic virus promoter, stably transformed cassava tissues and plants were obtained. Molecular evidence for stable expression of the transgenes will be presented.
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| Soybean maturity and environmental effects in savanna systems; I: dry matter accumulation, Singh, A.*, Carsky, R., Lucas, E. O.* and Dashiell, K., in: Journal of Sustainable Agriculture, volume 20, number 1, pages 75-93, 2002. |
|
Abstract:
Growing soybean varieties with high residue yield may help to sustain the soil organic matter (SOM) content when recycled. Replicated field trials were conducted in four Guinea savanna sites in Nigeria
to study the dry matter partitioning in six soybean genotypes and evaluate them for biomass production. The varieties were early TGx1485-1D
and late TGx1670-1F in Trial 1 and early TGx1485-1D, TGx1805-2E and TGx1681-3F, medium TGx1809-12E and late TGx923-2E and TGx1670-1F in Trial 2. On average, the proportion of total dry matter ac-cumulated in soybean plant parts was 42% in grain, 36% in stover, 12% in leaf litter and 11% in roots and nodules. While maturity class had no significant effect on the grain yield of soybean, significantly higher dry matter accumulation of roots and nodules, leaf litter, and stover was observed in medium and late varieties compared with early varieties (P < 0.05). Thus, medium and late varieties would be better able to sustain the
SOM content than early varieties when the residues are recycled. Strongly acid soils in a high rainfall environment limited soybean biomass production and potential to maintain SOM.
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| The effect of genotype, location and season on cassava starch extraction, Benesi, I.*, Labuschagne, M.*, Herselman, L.*, Mahungu, N. and Saka, J., in: Euphytica, volume 160, pages 59-74, 2008. [DOI] |
|
Abstract:
When cassava is harvested too early, it
often leads to reduction in yield, while delayed
harvest leads to development of woody and fibrous
tuberous roots, and reduction in starch content. The
optimum harvest time is not known. The objectives of
this study were to determine the effect of genotype,
location and season on starch extraction in order to
find an optimum harvest regime for cassava, and to
find the best parameter for monitoring starch levels in
cassava tuberous roots. Results showed that genotypic
effect was large for starch weight, starch
extraction rate on fresh weight basis, and root dry
matter content. This suggested that high starch
weights could be realised by selection of suitable
varieties for starch extraction. It was found that
cassava harvesting and starch extractions should be
done between October and November since the
highest starch extraction rates were achieved during
that period, and drying of the extracted starch using
the open air method was fast and convenient. The
results also suggested that starch levels can efficiently
be monitored using starch extraction rate on fresh
root weight basis. Starch content on fresh root basis
and root dry matter content can also be used to
determine the optimum time to harvest cassava for
starch extraction but were inferior to starch extraction
on fresh root weight basis.
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