nodD alleles of Sinorhizobium fredii USDA191 differentially influence soybean nodulation, nodC expression, and production of exopolysaccharides.

Abstract excerpt

All Rhizobium strains examined to date have one or multiple alleles of nodD. At least one copy of nodD and the presence of flavonoid exudates are required for nod gene induction and nodulation. Sinorhizobium fredii USDA191 has two copies of nodD. In this study, we demonstrate that inactivation of either copy of nodD caused a reduction in basal levels of expression of nodC. Extra copies of nodD1 had no effect on...

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