Graduate Thesis Or Dissertation
 

The relationship between resistance to a severe strain (BYMV-S) and the type strain (BYMV) of bean yellow mosaic virus in Phaseolus vulgaris L.

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  • Twenty-eight bean breeding lines and cultivars were classified for resistance to bean yellow mosaic virus type strain 7634 (BYMV) and severe strain Gilbert 6 (BYMV-S). 'Great Northern U.I. 31' (G.N. 31) and breeding lines (S-lines) selected from a cross between G.N. 31 and O.S.C. 21 were chosen as parents for their resistance to one or both virus strains. Additional susceptible parents included 'Medford,' 'Romano 1461,' and 'Dwarf Horticultural.' F₁, F₂, and F₃ progeny were screened for resistance to BYMV and BYMV-S. F₁ tests indicated resistance to be recessive for each virus strain. Possible complementary effects of genes from two resistant parents with similar genetic backgrounds were observed on susceptible F₁, F₂, and F₃ plants for both virus strains. Modifying genes apparently obscured or reduced symptom expression in crosses involving the S-lines, G.N. 31, and 'Medford.' F₃ tests were conducted on only five of the crosses. With crosses between 'Dwarf Horticultural' and G.N. 31 F₃ tests indicated that two recessive genes controlled resistance as a 15/1 ratio susceptible: resistant was found for both virus strains. Although modifier effects and complementary gene action were proposed for the cross between the resistant parents, G.N. 31 and Sl-5-1, a two gene system was also suggested in the F₃ as an acceptable nine: seven ratio was obtained in most cases. In addition, reciprocal differences were observed with Sl-5-1, 'Medford, ' and 'Dwarf Horticultural' as female parents. F₃ tests were also used to determine the relationship of inheritance of resistance between the two virus strains. A partial relationship in the inheritance of resistance was found using chi square tests relating family classification of both strains and parental reactions. Using additional chi square tests and correlation coefficients a stronger relationship was found in the classification of families for severity of expression. In crosses where a positive relationship was not indicated, differences were attributed to possible cytoplasmic effects and complementary modifiers.
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