PMID: 15242277Jul 10, 2004Paper

Molecular aspects of soybean cultivar-specific nodulation by Sinorhizobium fredii USDA257

Indian Journal of Experimental Biology
K Annapurna, Hari B Krishnan

Abstract

Sinorhizobium fredii USDA257 forms nitrogen-fixing nodules in association with the primitive soybean cultivar 'Peking' but fails to initiate nodules on many advanced soybean cultivars, including 'McCall'. This distinction is controlled by a set of nodulation genes termed nolXWBTUV. Inactivation of any of these genes enables USDA257 to nodulate McCall and many other improved soybean cultivars. Mutation in the nolXWBTUV locus also alters the Nod factor structure resulting in the production of a novel molecule with glucose incorporated into the chitin backbone. Some of the genes located in the nolXWBTUV locus reveal sequence homologies to known components of the type III secretion system (TTSS) of plant and animal pathogenic bacteria. Recent studies have demonstrated the presence of a complete TTSS in USDA257 and few other symbiotic bacteria. The TTSS cluster of USDA257 contains 27 open reading frames out of which 10 code for the structural components of the TTSS. USDA257, when grown in presence of flavonoids, secrete several proteins called Nops (Nodulation Outer Proteins) into the extracellular environment. Genes located in the TTSS of USDA257 encode some of the extracellular proteins, such as NopX, NopB, and NopL. These type II...Continue Reading

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