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Evaluation of water yam (Dioscorea alata L.) germplasm for reaction to yam anthracnose and virus diseases and their effect on yield

dc.contributor.authorEgesi, Chiedozie N.
dc.contributor.authorOdu, B.
dc.contributor.authorOgunyemi, S.
dc.contributor.authorAsiedu, Robert
dc.contributor.authorHughes, J.
dc.date.accessioned2019-12-04T11:19:39Z
dc.date.available2019-12-04T11:19:39Z
dc.date.issued2007
dc.identifier.citationEgesi, C.N., Odu, B., Ogunyemi, S., Asiedu, R. & Hughes, J. (2007). Evaluation of water yam (Dioscorea alata L.) germplasm for reaction to yam anthracnose and virus diseases and their effect on yield. Journal of Phytopathology, 155(9), 536-543.
dc.identifier.urihttps://hdl.handle.net/20.500.12478/3505
dc.description.abstractUse 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.
dc.language.isoen
dc.subjectYams
dc.subjectAnthracnose
dc.subjectVirus Disease
dc.subjectFresh Tuber Yield
dc.subjectGermplasm
dc.subjectYam Mosaic Virus
dc.subjectPotyvirus
dc.titleEvaluation of water yam (Dioscorea alata L.) germplasm for reaction to yam anthracnose and virus diseases and their effect on yield
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.affiliationNational Root Crops Research Institute, Nigeria
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationUniversity of Ibadan
cg.contributor.affiliationAsian Vegetable Research and Development Center
cg.coverage.regionAfrica
cg.coverage.regionAsia
cg.coverage.regionWest Africa
cg.coverage.regionEast Asia
cg.coverage.countryNigeria
cg.coverage.countryTaiwan
cg.isijournalISI Journal
cg.authorship.typesCGIAR and developing country institute
cg.iitasubjectYam
cg.iitasubjectPlant Genetic Resources
cg.iitasubjectPlant Production
cg.iitasubjectNutrition
cg.iitasubjectFood Security
cg.iitasubjectPlant Diseases
cg.iitasubjectPlant Breeding
cg.iitasubjectGenetic Improvement
cg.iitasubjectHandling, Transport, Storage And Protection Of Agricultural Products
cg.iitasubjectImpact Assessment
cg.iitasubjectLivelihoods
cg.iitasubjectFood Science
cg.iitasubjectAgribusiness
cg.iitasubjectPost-Harvesting Technology
cg.iitasubjectDisease Control
cg.iitasubjectPests Of Plants
cg.accessibilitystatusLimited Access
local.dspaceid95476
cg.identifier.doihttps://doi.org/10.1111/j.1439-0434.2007.01273.x


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