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    Complementarity of genes for resistance to greenbug [Schizaphis graminum (Rondani)], biotype E, in sorghum [Sorghum bicolor (L.) Moench]

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    Date
    1991
    Author
    Dixon, Alfred G.O.
    Bramel-Cox, P.J.
    Harvet, T.L.
    Type
    Journal Article
    Metadata
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    Abstract/Description
    Gene complementarity among various sources of resistance to greenbug biotype E was assessed. Analysis of the F2 generation of crosses between susceptible and resistant parents (mating 1) and among sources of resistance (mating 2) suggested that resistance in sorghum to greenbug biotype E was complexly inherited and, to some extent, dependent on the nature of both the resistant and susceptible parents. Positive transgressive segregation in the F2 generations of both matings was found to be due to effective plus factors, contributed by both parents in a cross, which complemented each other. The number of plus factors ranged from one to two in the susceptible parents and from two to five in the resistant parents of mating 1, and from one to five in the parents of mating 2. The consistently significant reciprocal effects shown by Sarvasi and PI264453 indicated that these sources had major factors for resistance in their cytoplasms, which were expressed in all their crosses. The results from this study indicated that the sources of resistance complemented each other to give increased number of F2 segregates with increased resistance. Thus, it should be possible to increase and diversify resistance of sorghum to greenbug biotype E by accumulating different, effective plus factors from various sources through recurrent selection.
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/5941
    IITA Subjects
    Genetic Improvement; Pests Of Plants; Grain Legumes
    Agrovoc Terms
    Epistasis; Genetics; Greenbugs; Sorghum; Cytoplasm
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Collections
    • Journal and Journal Articles4835
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