Titles (31)Keywords (1)Abstracts (2)
A genetic linkage map of water yam (Dioscorea alata L.) based on AFLP markers and QTL analysis for anthracnose resistance, Mignouna, H., Mank, R., Ellis, T., Van den Bosch, N., Asiedu, R., Abang, M. and Peleman, J., in: Theoretical and Applied Genetics, volume 105, pages 726-735, 2002. [DOI]
 
An EST-SSR based genetic linkage map and identification of QTLs for anthracnose disease resistance in water yam (Dioscorea alata L.), Bhattacharjee, R., Nwadili, C., Saski, C. A., Agre, A. P., Scheffler, B. E., Augusto, J., Lopez-Montes, A., Onyeka, T. J.*, Kumar, P. L. and Bandyopadhyay, R., in: PLoS ONE, volume 13, number 10:e0197717, pages 1-16, ISSN 1932-6203, 2018. [DOI]
 
An EST-SSR based genetic linkage map of water yam (Dioscorea alata L.) and identification of QTL (s) for anthracnose disease: proceeding (poster), Bhattacharjee, R., Nwadili, C., Saski, C. A., Scheffler, B. E., Onyeka, J.*, Augusto, J., Lopez-Montes, A., Asiedu, R., Kumar, P. L. and Bandyopadhyay, R., 2016.
 
Anthracnose disease of yams in West Africa: recent advances in research and future perspectives, Abang, M., Asiedu, R., Mignouna, H., Green, K., Wolf, G. and Winter, S., in: Root Crops: the small processor and development of local food industries for market economy: proceeding of the Eighth Triennial Syposium of the International Society for Tropical Root Crops - Africa Branch (ISTRC-AB), 12-16 November 2001, Ibadan, Nigeria, pages 562-571, 2003.
 
Assessment of water yam (Dioscorea alata L.) landrace varieties for resistance to anthracnose disease, Bakayoko, L., Pokou, D. N., Essis, B. S., Kouakou, A. M., Dibi, K. E. B., Kouassi, A. B., Nzue, B., Koutouan, T. T., Zohouri, P. G., N'guetta, A. S., Agre, A. P., Mondo, J. and Adebola, P. O., in: African Journal of Agricultural Research, volume 18, number 3: 2A80CC368784, pages 178-193, ISSN 1991-637X, 2022. [DOI]
 
Characterization of some fungal pathogens causing anthracnose disease on yam in Cross River State, Nigeria, Okon, N. I.*, Markson, A. A. A.*, Okon, E. I.*, Ita, E. E.*, Uyoh, E. A.*, Ene-Obong, E. O. E.* and Ntui, V. O., in: PloS ONE, volume 17, number 6: e0270601, pages 1-19, ISSN 1932-6203, 2022. [DOI]
 
Comparative reliability of screening parameters for anthracnose resistance in water yam (Dioscorea alata), Nwadili, C., Augusto, J., Bhattacharjee, R., Atehnkeng, J., Lopez-Montes, A., Onyeka, T. J.*, Kumar, P. L., Asiedu, R. and Bandyopadhyay, R., in: Plant Disease, pages 1-8, ISSN 0191-2917, 2016. [DOI]
 
Current status of yam anthracnose disease in various agroecological zones of Nigeria., Onyeka, T. J.*, Zandjanakou-Tachin, M., Bandyopadhyay, R., Asiedu, R. and Ikeorgu, J.*, Abstract (Poster) in Book of Abstracts of the 11th Triennial Symposium of ISTRC-AB, held at Memling Hotel, Kinshasa. 4-8 October, 2010.
 
Development of microsatellite markers for anthracnose resistance in greater yam (Dioscorea alata L.) from expressed sequence tags of heterologous crop species, Narina, S. S., Montegue, P., Asiedu, R. and Mohamed, A. I., in: Journal of Root Crops, volume 38, number 1, pages 64-69, ISSN 0378-2409, 2012.
 
Distribution and severity of Yam anthracnose in Nigeria, Akem, C. and Asiedu, R., in: Root Crops for food security in Africa: proceedings of the Fifth Triennial Symposium of the International Society for Tropical Root Crops-Africa Branch, 22-28 November 1992, Kampala, Uganda, pages 297-301, ISTRC-AB; CTA; International Institute of Tropical Agriculture (IITA), 1994.
 
Distribution of yam anthracnose disease in Nigeria, Aduramigba-Modupe, A. O.*, Odebode, C. A.* and Asiedu, R., in: African Journal of Root and Tuber Crops, volume 8, number 1, pages 51-55, ISSN 1118-2075, 2010.
 
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.
 
Estimate App for yam anthracnose disease phenotyping: user guide, Kolade, O. and Kumar, P. L., Booklet, 2021.
 
Evaluation of water yam (Dioscorea alata I.) genotypes for reaction to yam anthracnose disease, Ogunyemi, S. and Asiedu, R., in: Proceedings of 9th ISTRC-AB symposium, pages 368-374, Mombasa, Kenya, 2007.
 
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.
 
Evaluation of water yam (Dioscorea alata L.) germplasm for reaction to yam anthracnose and virus diseases and their effect on yield, Egesi, C. N.*, Odu, B., Ogunyemi, S., Asiedu, R. and Hughes, J., in: Journal of Phytopathology, volume 155, number 9, pages 536-543, 2007.
 
Evidence for high evolutionary potential of Colletotrichum gloeosporioides, the causal agent of yam anthracnose disease, Abang, M., Asiedu, R., Hoffmann, P., Wolf, G., Mignouna, H. and Winter, S., in: 9th Triennial Symposium of the International Society for Tropical Root Crops-Africa Branch (ISTRC-AB); October 31 to November 5, 2004, Mombasa, Kenya, 2004.
 
Evidence for high evolutionary potential of Colletotrichum gloeosporioides, the causal agent of yam anthracnose disease, Abang, M., Asiedu, R., Hoffmann, P., Wolf, G., Mignouna, H. and Winter, S., in: Proceedings of 9th ISTRC-AB symposium, Mombasa, Kenya, pages 602-613, Mombasa, Kenya, 2007.
 
Identification and potential application of RAPD markers for anthracnose resistance in water yam (Dioscorea alata), Mignouna, H., Abang, M., Onasanya, A. and Asiedu, R., in: Annals of Applied Biology, volume 141, pages 61-66, 2002.
 
Identification of QTLs controlling resistance to anthracnose disease in water yam (Dioscorea alata), Agre, A. P., Darkwa, K.*, Olasanmi, B.*, Kolade, O., Mournet, P., Bhattacharjee, R., Lopez-Montes, A ., De Koeyer, D ., Adebola, P. O., Kumar, P. L., Asiedu, R. and Asfaw, A., in: Genes, volume 13, number 2: 347, pages 1-16, ISSN 2073-4425, 2022. [DOI]
 
Inheritance of resistance in water yam (Disocorea alata) to anthracnose (Colletotrichum gloeosporioides), Mignouna, H., Green, M. M., Abang, K. R. and Asiedu, R., in: Theoretical and Applied Genetics, volume 103, pages 52-55, ISSN 0040-5752, 2001.
 
Molecular characterization of Colletotrichium gloeosporioides responsible for anthracnose of yam and cassava in Nigeria, and development of diagnostic PCR assay, Sharma, K., Ayodele, M., Bandyopadhyay, R., Asiedu, R. and Kumar, P. L., International Society for Tropical Root Crops (ISTRC), 2009.
 
Molecular identification of Colletotrichum gloeosporioides causing yam anthracnose in Nigeria, Abang, M., Winter, S., Green, K., Hoffmann, P., Mignouna, H. and Wolf, G., in: Plant Pathology, volume 51, number 1, pages 63-71, ISSN 0032-0862, 2002.
 
Molecular taxonomic, epidemiological and population genetic approaches to understanding yam anthracnose disease, Abang, M., Winter, S., Mignouna, H., Green, K. and Asiedu, R., in: African Journal of Biotechnology, volume 2, number 12, pages 486-496, ISSN 1684-5315, 2003.
 
Quantitative methods for assessing the severity of anthracnose on yam (Dioscorea alata), Simons, S. A. and Green, K., in: Tropical Science, volume 34, pages 216-224, ISSN 0041-3291, 1994.
 
Reaction of Dioscorea alata (water yam) to anthracnose disease in Nigeria, Aduramigba-Modupe, A.O., Asiedu, R. and Odebode, C. A.*, in: Journal of Food, Agriculture and Environment, volume 6, number 3-4, pages 248-252, 2008.
 
Resistance of water yam to anthracnose disease in Nigeria, Aduramigba-Modupe, A.O., Asiedu, R., Odebode, C. A.* and Oladiran, A., in: Proceedings of the African Crop Science Conference, 22-26 October 2001, Lagos, Nigeria, pages 483-486, African Crop Science Society, 2001.
 
Screening of F1 mapping population of yam (Dioscorea alata) for resistance to anthracnose (Colletotrichum gloeosporioides) in the screenhouse and field, Nwadili, C., Bandyopadhyay, R., Bhattacharjee, R., Augusto, J., Lopez-Montes, A. and Onyeka, T. J.*, Abstract in First Global Conference on Yam 'to harness research innovations to unleash the potential of yam', 3-6 October, 2013 Accra, Ghana, 2013.
 
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.
 
Strategies to combat the problem of yam anthracnose disease: status and prospects, Ntui, V. O., Uyoh, E. A.*, Ita, E. E.*, Markson, A. A. A.*, Tripathi, J., Okon, N. I.*, Akpan, M. O.*, Phillip, J. O.*, Brisibe, E. A.*, Tripathi, L. and Ene-Obong, E. O. E.*, in: Molecular Plant Pathology, volume 22, number 10, pages 1302-1314, ISSN 1464-6722, 2021. [DOI]
 
Yam anthracnose disease: field symptoms and laboratory diagnostics, Ayodele, M., Hughes, J. and Asiedu, R., in: Proccedings of the 9th ISTRC-AB symposium, Mombasa, Kenya, 2007.
 
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.
 
Keywords:Colletotrichum gloeosporioides; genotype x environment (G x E) interaction; stable resistance; water yam; yam anthracnose; yam mosaic virus

Evaluation of water yam (Dioscorea alata L.) germplasm for reaction to yam anthracnose and virus diseases and their effect on yield, Egesi, C. N.*, Odu, B., Ogunyemi, S., Asiedu, R. and Hughes, J., in: Journal of Phytopathology, volume 155, number 9, pages 536-543, 2007.
 
Abstract:
Use of genetic resistance is the most practical and economic way to manage major diseases of yams. In a search for sources of resistance, 40 water yam (Dioscorea alata L.) accessions from Benin, Ghana, Nigeria and Puerto Rico were screened under natural disease infection conditions in Ibadan, Nigeria. The accessions were evaluated at 1, 3 and 6 months after planting (MAP) for severity of yam anthracnose and viral diseases. The effect of the pathogens on yield was also evaluated at harvest 9 MAP. There were significant differences (P < 0.001) between accessions for severities of anthracnose and viral diseases. Eight (20%) of them had lower anthracnose area under disease progress curves (AUDPC) values than the resistant check while 10 (25%) had AUDPC values below the trial mean. There were significant variations (P < 0.001) in yield components among the accessions. There was significant negative correlation of anthracnose severity with fresh tuber yield (r = -0.51) and with number of tubers per plot (r = -0.40). Similarly, significant negative correlations were observed of virus disease severity with fresh tuber yield (r = -0.78) and number of tubers per plot (r = -0.65). Linear regression models also showed that the fresh yield had significant negative relationships with anthracnose (R2 = 0.26) and viral (R2 = 0.62) diseases. The accessions identified as resistant constitute a valuable resource for breeding of resistant germplasm.

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.