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    Comparative reliability of screening parameters for anthracnose resistance in water yam (Dioscorea alata)

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    S16ArtNwadiliComparativeInthomDev.pdf (672.7Kb)
    Date
    2016
    Author
    Nwadili, C.O.
    Augusto, J.
    Bhattacharjee, R.
    Atehnkeng, J.
    López Montes, A.
    Onyeka, T.J.
    Kumar, P.L.
    Asiedu, Robert
    Bandyopadhyay, Ranajit
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Anthracnose, caused by Colletotrichum gloeosporioides, is one of the major constraints limiting water yam (Dioscorea alata) production in the tropics. In this region, yam anthracnose control is mostly achieved by the deployment of moderately resistant yam genotypes. Therefore, screening for new sources of anthracnose resistance is an important aspect of yam research in the tropics. The reliability and applicability of different yam anthracnose rating parameters has not been fully examined. Disease severity on detached leaves in the laboratory and leaf severity, lesion size, and spore production on whole plants in the greenhouse were used to screen an F1 yam population and correlate screening results with field evaluations. Anthracnose lesion size had the smallest predicted residual means but whole-plant severity and detached-leaf severity had the best variance homogeneity and relatively small predicted residual means. The concordance correlation coefficient (rc) and κ statistic were used to determine the agreement between anthracnose rating parameters and field evaluations. Detached-leaf (rc = 0.95, κ = 0.81) and whole-plant (rc = 0.96, κ = 0.86) evaluations had high positive agreement with field evaluation but spore production (κ = 0.69) and lesion size (κ = 0.57) had moderate positive agreement. These results suggest that all the evaluated rating parameters can be used to successfully screen yam germplasm for anthracnose resistance but lesion size and spore production data may need to be transformed.
    https://dx.doi.org/10.1094/PDIS-06-16-0924-RE
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/1429
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1094/PDIS-06-16-0924-RE
    IITA Subjects
    Disease Control; Plant Diseases; Yam
    Agrovoc Terms
    Colletetrichum Gloeosporioides; Dioscorea Alata; Yams; Anthracnosis; Greenhouses; Genotypes; Disease Management
    Regions
    Africa; West Africa
    Countries
    Benin; Cote D'Ivoire; Ghana; Nigeria; Togo
    Journals
    Plant Disease
    Collections
    • Journal and Journal Articles4835
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