Inheritance of Delayed Leaf Senescence in Soybean
1984
Pierce, Robert O. | Knowles, P. F. | Phillips, Donald
Inheritance studies of the delayed leaf senescence phenotype (DLS) in soybean, Glycine max (L.) Merr. were conducted in field environments over a 4-year period. Studies of F₂ and F₃ generations from the ‘Lee 68’ ✕ ‘L63-1097’ cross indicated that two major genes, probably Dt₁,dt₁, affecting growth habit, and E₁,e₁, affecting flowering date, were involved, with the genotype dt₁dt₁e₁e₁ having the DLS phenotype. Selected lines in the F₆ generation that showed uniform DLS traits were crossed to ‘Amsoy 71’, ‘Elf’, ‘Evans’, ‘Harosoy L2’, and ‘Williams’. Segregation ratios in the F₂ and F₃ generations from crosses involving Amsoy 71, Harosoy L2, and Williams indicated that a single major gene, assumed to be Dt₁,dt₁, was involved in DLS expression. Studies with Harosoy L2 and ‘Clark LI’ isolines of known genotype at the Dt₁,dt₁, Dt₂,dt₂, E₁,e₁, and E₂,e₂ loci showed that the DLS phenotype was expressed fully only when the dt₁dt₁dt₂dt₂e₁e₁e₂e₂ genotype was present. Observations of F₂ populations and F₃ lines of crosses involving DLS lines and Elf, both of which have the dt₁dt₁e₁e₁ genotype, indicated that differences between the parents were due to an undetermined number of modifier genes with small effects. Results from crosses involving DLS lines and Evans were inconclusive.
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