A cultivar-specific interaction between Rhizobium leguminosarum bv. trifolii and subterranean clover is controlled by nodM, other bacterial cultivar specificity genes, and a single recessive host gene.

A cultivar-specific interaction between Rhizobium leguminosarum bv. trifolii and subterranean clover is controlled by nodM, other bacterial cultivar specificity genes, and a single recessive host gene.