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Inheritance of Promiscuous Nodulation in Soybean
Author(s) -
Gwata E. T.,
Wofford D. S.,
Boote K. J.,
Blount A. R.,
Pfahler P. L.
Publication year - 2005
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2005.0635
Subject(s) - biology , bradyrhizobium japonicum , rhizobia , bradyrhizobium , inoculation , cultivar , nitrogen fixation , locus (genetics) , allele , rhizobiaceae , botany , symbiosis , horticulture , agronomy , gene , genetics , rhizobium , bacteria
The development of functional root nodules resulting in N 2 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, N 2 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.