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Inheritance of Delayed Leaf Senescence in Soybean 1
Author(s) -
Pierce Robert O.,
Knowles P. F.,
Phillips Donald
Publication year - 1984
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1984.0011183x002400030021x
Subject(s) - biology , genotype , phenotype , gene , genetics , microbiology and biotechnology , senescence , glycine , inheritance (genetic algorithm) , amino acid
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 F 2 and F 3 generations from the ‘Lee 68’ ✕ ‘L63‐1097’ cross indicated that two major genes, probably Dt 1 , dt 1 , affecting growth habit, and E 1 , e 1 , affecting flowering date, were involved, with the genotype dt 1 dt 1 e 1 e 1 having the DLS phenotype. Selected lines in the F 6 generation that showed uniform DLS traits were crossed to ‘Amsoy 71’, ‘Elf’, ‘Evans’, ‘Harosoy L2’, and ‘Williams’. Segregation ratios in the F 2 and F 3 generations from crosses involving Amsoy 71, Harosoy L2, and Williams indicated that a single major gene, assumed to be Dt 1 , dt 1 , was involved in DLS expression. Studies with Harosoy L2 and ‘Clark LI’ isolines of known genotype at the Dt 1 , dt 1 , Dt 2 , dt 2 , E 1 , e 1 , and E 2 , e 2 loci showed that the DLS phenotype was expressed fully only when the dt 1 dt 1 dt 2 dt 2 e 1 e 1 e 2 e 2 genotype was present. Observations of F 2 populations and F 3 lines of crosses involving DLS lines and Elf, both of which have the dt 1 dt 1 e 1 e 1 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.