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The Journal of Heredity 1993:84(2):109-111
© 1993 The American Genetic Association 84:109-111

research-article

Soybean Genes Rj2, Rmd, and Rps2 in Linkage Group 19

D. G. Lohnes, R. E. Wagner, and R. L. Bernard

Department of Agronomy, University of Illinois 1102 S. Goodwin Ave., Urbana, IL 61801

Abstract

Four genes backcrossed into soybean [Glycine max (L.) Merr.] cv. Williams were evaluated for linkage. The genes investigated were as follows: Rj2, conferring non-nodulation with certain strains of Bradyrhizobium japonicum (Kirchner) Buchanan; Rmd, conferring resistance to Microsphaera diffusa Cooke & Peck (causal agent of powdery mildew); Rps2, conferring resistance to Phytophthora sojae Kaufmann & Gerdemann (causal agent of phytophthora root and stem rot); and Ti controlling a trypsin inhibitor variant in seeds. A cross was made that would segregate for all four gene pairs, and F3 families were classified for the four traits. Chi-square analysis of the data indicated that Ti segregated independently, but that Rj2, Rmd, and Rps2 were linked. Maximum likelihood estimates of gene linkage gave a recombination value of 1.9% for Rj2 and Rmd, 3.6% for Rj2 and Rps2, and 2.3% for Rmd and Rps2. The order of the genes is therefore Rj2 Rmd Rps2.


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[Abstract] [Full Text] [PDF]


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