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Genetic Linkage of the Rps1 and L2 Loci in Soybean

USDA-ARS, Soybean Production Research Unit, P.O. Box 196, Stoneville, MS 38776

^* Corresponding author.

Genome mapping of important genes in soybean, Glycine max (L.) Merr., is rather limited compared with that of other major crops. Such genetic information is needed by those involved in soybean genetic improvement. In this study, genetic linkage of the Rpsl locus controlling reaction to Phytophthora megasperma Drechs. f. sp. glycinea T. Kuan & D.C. Erwin, and the L2 locus controlling pod wall color was tested. Populations segregating for both genes were derived from the cross Bedford x D78-3173. At maturity the pod wall color of F₂ plants was recorded. The F₃ seedlings derived from those plants were evaluated in a greenhouse for reaction to race 1 of P. megasperma using the hypocotyl puncture inoculation method. The chi-square test for linkage was significant (P < 0.0005). Recombination was calculated by the ratio of products method (27 ± 4.3%) and maximum likelihood method (28 ± 4.1%), indicating that these genes are on the same chromosome.

Received for publication July 15, 1992.