Abstract
Abstract Linkage detection and estimation procedures based on deviation from expected F2 segregation ratios in common bean (Phaseolus vulgaris L.) were used to localize two genes. The product ratio method of estimation was used with four-class segregations, and the maximum likelihood method was used with three-class segregations and for combining multiple sets of data. A tight linkage of 1.6 ± 1.5 map units (m.u.) was found between dwarf seed (ds) and dark green savoy leaf (dgs), two genes in linkage group VII. A third gene in linkage group VII, stipelless lanceolate leaf (sl), was found to be 18.7 ± 1.6 m.u. from ds. The distance between dgs and sl was found to be 21.2 ± 1.0 m.u., thus establishing that ds is located between dgs and sl. This location of ds supports the contention that ds and tenuis (te), a gene described by Lamprecht, are the same gene. In linkage group IX, an estimate of 4.6 ± 1.5 m.u. was obtained for the linkage between diamond leaf (dia) and progressive chlorosis (prc). Spindly branch (sb) was found to be 15.4 ± 0.7 m.u. from prc and 11.4 ± 1.1 m.u. from dia. Thus, dia is located between sb and prc. The independence of linkage groups VII and IX is demonstrated by the independence of representatives of the two groups.
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