Abstract
The development of functional root nodules resulting in N2 fixation in soybean [Glycine max (L.) Merr] can be induced by two strains of rhizobia, Bradyrhizobium japonicum (B. japonicum) and Bradyrhizobium spp. (cowpea‐type). Genetic control of response to each type has been recognized in soybeans with two categories identified after inoculation with cowpea‐type rhizobial strains: (i) promiscuous, which produces functional nodules, N2 fixation, and green leaves; and (ii) nonpromiscuous, which forms no or nonfunctional nodules and yellow leaves. Using leaf color, segregation patterns indicated that nonpromiscuity was dominant with two alleles segregating at each of two independent loci. With this genetic model, the expression of promiscuity requires the presence of both recessive alleles at each locus. Since the cowpea strain is indigenous to the soils in many tropical areas, especially Africa, the development of promiscuous soybean cultivars would greatly increase soybean production without commercial seed inoculation.
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