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Plasmids which contained wild-type or mutatedRhizobium meliloti nodulation (nod ) genes were introduced into Nod− R. trifolii mutants ANU453 and ANU851 and tested for their ability to nodulate clover. Cloned wild-type and mutatedR. meliloti nod gene segments restored ANU851 to Nod+ , with the exception ofnodD mutants. Similarly, wild-type and mutantR. meliloti nod genes complemented ANU453 to Nod+ , except fornodCII mutants. Thus, ANU851 identifies the equivalent of theR. meliloti nodD genes, and ANU453 specifies the equivalent of theR. meliloti nodCII genes. In addition, cloned wild-typeR. trifolii nod genes were introduced into sevenR. meliloti Nod− mutants. All seven mutants were restored to Nod+ on alfalfa. Our results indicate that these genes represent common nodulation functions and argue for an allelic relationship betweennod genes inR. meliloti andR. trifolii .

Conserved Nodulation Genes in Rhizobium meliloti and Rhizobium trifolii