Abstract
In common bean (Phaseolus vulgaris L.) the diaphorase (DIA) allozyme variant Diap-2105 is frequently present in plants with upright, type II plant architecture. The genetic relationship between upright plant architecture and Diap-2105 was investigated in eight F2 populations derived from crosses between navy bean and pinto bean parental lines differing for type I, II, and III growth habit and DIA genotype. Segregation at the Diap-2 locus followed the expected 1:2:1 ratio in all eight F2 populations and when pooled across F2 populations. F2 data from 1345 individuals indicated that plant architecture and the Diap-2 locus are not linked (r=0.03, P=0.333). However, the Diap-2105 allozyme was present in 71% of advanced navy, pinto, and great northern genotypes with type II plant architecture. Due to random drift, Diap-2105, initially associated with type II architecture through founder effect, may be maintained in such genotypes without providing greater fitness or without being associated with a locus or linked loci governing upright plant architecture.
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