Positioning 3 qualitative trait loci on soybean molecular linkage group E

Abstract

In soybean (Glycine max [L.] Merr.), 3 qualitative trait loci (Pb, Y9, and Y17) are located on classical linkage group 14, which corresponds to molecular linkage group (MLG) E. The Pb locus conditions sharp/blunt pubescence tip; the y9 and y17 loci condition green/chlorotic foliage. The gene order is not known. Our objective was to determine the gene order on soybean MLG E of the Pb, Y9, and Y17 loci using previously mapped simple sequence repeat (SSR) markers. Allelism tests between y9 and y17 gave normal green foliage F1 plants, indicating nonallelism. Our F2 data from the allelism test could not distinguish between a 1:1 or a 9:7 ratio. The F2:3 family segregation indicated a very close genetic linkage between the y9 and the y17 loci. Two molecular mapping populations were developed. Population-1 segregated for Pb and y9, and population-2 segregated for Pb and y17. The gene order on soybean MLG E, using SSR markers, was Pb, Y9, and Y17. © The American Genetic Association. 2008. All rights reserved.