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    Inheritance of resistance in water yam (Disocorea alata) to anthracnose (Colletotrichum gloeosporioides)

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    Date
    2001-07
    Author
    Mignouna, H.D.
    Abang, Mathew M.
    Green, K.R.
    Asiedu, Robert
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Colletotrichum gloeosporioides causes anthracnose, the most severe foliar disease of field-grown water yam (Dioscorea alata). The inheritance of resistance to a moderately virulent (FGS) strain of the pathogen was investigated in crosses between tetraploid D. alata genotypes: TDa 95/00328 (resistant)×TDa 95–310 (susceptible) (cross A), and TDa 85/00257 (resistant)×TDa 92–2 (susceptible) (cross B). Segregation of F1 progeny fitted genetic ratios of 3:1, 5:1 (crosses A and B) and 7:1 (cross A) resistant:susceptible when inoculated with the FGS strain, indicating that resistance is dominantly inherited and suggesting that more than one gene controls the inheritance of resistance to this strain in the accessions studied. When parental and progeny lines of cross A were inoculated with an aggressive (SGG) strain of the pathogen, all plants expressed a susceptible phenotype, indicating strain-specific resistance in TDa 95/00328. Screening of 20 cultivars/landraces confirmed the high susceptibility of D. alata accessions to the SGG strain and revealed the presence of apparent strain non-specific resistance in TDa 85/00257. TDa 85/00257 and TDa 87/01091 which were resistant to the SGG strain, will be useful both as sources of resistance and in the development of a host differential series for D. alata.
    https://dx.doi.org/10.1007/s001220000531
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/4344
    Non-IITA Authors ORCID
    Robert Asieduhttps://orcid.org/0000-0001-8943-2376
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1007/s001220000531
    IITA Subjects
    Plant Breeding; Yam
    Agrovoc Terms
    Colletotrichum Gloeosporioides; Yams; Anthracnosis; Screening; Inheritance; Resistance Varieties
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Journals
    Theoretical and Applied Genetics
    Collections
    • Journal and Journal Articles4835
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