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A second dominant gene for resistance to peanut mottle virus in soybeans glycine max



A second dominant gene for resistance to peanut mottle virus in soybeans glycine max



Crop Science 25(2): 314-316



The soybean [Glycine max (L.) Merr.] cultivars 'Arksoy'. 'Dorman', 'York', 'Shore' and 'CNS' each contain a single dominant gene for resistance to peanut motile virus (PMV). Crosses were made among these cultivars and F3 progenies of individual F2 plants were inoculated with (PMV). The degree and type of segregation that occurred was used to determine the allelic relationship among the genes in these cultivars. This information is valuable to soybean breeders wishing to incorporate PMV resistance into breeding lines. Segregation was not observed in crosses among 'Arksoy', Dorman', 'York and 'Shore'. It was concluded that they contain the prevously reported Rpv1 gene for PMV resistance. Crosses of CNS with 'Dorman', Shore, and York segregated for PMV reaction. The data provided a good fit to the ratio expected from 2 dominant genes segregating independently. Assignment of a symbol for the CNS gene is being postponed until its allelic relationship with rpv2 in 'Peking' is determined. No evidence for linkage was found between the 2 dominant genes for PMV resistance or between them and the pubescence color gene, T-t.

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