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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

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    Date
    2007
    Author
    Egesi, Chiedozie N.
    Odu, B.
    Ogunyemi, S.
    Asiedu, Robert
    Hughes, J.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    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.
    https://doi.org/10.1111/j.1439-0434.2007.01273.x
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/3505
    Digital Object Identifier (DOI)
    https://doi.org/10.1111/j.1439-0434.2007.01273.x
    IITA Subjects
    Yam; Plant Genetic Resources; Plant Production; Nutrition; Food Security; Plant Diseases; Plant Breeding; Genetic Improvement; Handling, Transport, Storage And Protection Of Agricultural Products; Impact Assessment; Livelihoods; Food Science; Agribusiness; Post-Harvesting Technology; Disease Control; Pests Of Plants
    Agrovoc Terms
    Yams; Anthracnose; Virus Disease; Fresh Tuber Yield; Germplasm; Yam Mosaic Virus; Potyvirus
    Regions
    Africa; Asia; West Africa; East Asia
    Countries
    Nigeria; Taiwan
    Collections
    • Journal and Journal Articles4457
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