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    Screening of water yam (Dioscorea alata L.) genotypes for reactions to viruses in Nigeria

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    odu-screening-2006.pdf (113.4Kb)
    Date
    2006
    Author
    Odu, B.O.
    Asiedu, Robert
    Shoyinka, S.A.
    Hughes, J.A.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    Studies were made to identify sources of resistance to yam viruses in Dioscorea alata. Forty genotypes of D. alata were evaluated in both the field and in the screenhouse for reactions to the yam viruses: Yam mosaic virus (YMV), genus Potyvirus; Dioscorea alata virus (DAV), genus Potyvirus; Cucumber mosaic virus (CMV), genus Cucumovirus; and Dioscorea alata bacilliform virus (DaBV), genus Badnavirus. The D. alata genotypes were planted in the field and subsequently scored for virus symptom severity. All the genotypes were also planted in an insect-proofed screenhouse, and challenged mechanically and by vectors for susceptibility to each of the viruses. Analysis of variance (anova) of the symptom severity scores showed that the genotypes responded differently (P < 0.01) to virus disease in the field. Field evaluation also showed that TDa 291 (a landrace genotype from Puerto Rico), TDa 87/01091, TDa 96-4, TDa 95-163 and TDa 289 from Nigeria, and TDa 95-25 (a landrace genotype from Ghana), had a low virus disease symptom rating. Overall screening results showed that two D. alata genotypes (TDa 289 and TDa 291) are good sources of resistance to YMV, DAV and CMV, and that they are tolerant to DaBV.
    http://dx.doi.org/10.1111/j.1439-0434.2006.01180.x
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/3026
    Digital Object Identifier (DOI)
    http://dx.doi.org/10.1111/j.1439-0434.2006.01180.x
    IITA Subjects
    Yam; Disease Control; Farm Management; Food Security; Plant Breeding; Nutrition; Plant Genetic Resources; Agribusiness; Genetic Improvement; Handling, Transport, Storage And Protection Of Agricultural Products; Livelihoods; Plant Diseases; Plant Production; Pests Of Plants
    Agrovoc Terms
    Dioscorea Alata; Genotypes; Yam Mosaic Virus; Genus Potyvirus; Cucumber Mosaic Virus; Screenhouse; Resistance
    Regions
    Africa; Asia; West Africa; East Asia
    Countries
    Nigeria; Taiwan
    Collections
    • Journal and Journal Articles4835
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