A total of 63 strains of rhizobia isolated from Hainan Province, a tropical region of the People's Republic of China, and 27 representative strains belonging to the genera Rhizobium, Bradyrhizobium, and Agrobacterium were compared by performing numerical taxonomy, DNA hybridization, and DNA base composition analysis to determine the relationships among these rhizobia. The results indicated that...

How good and how pleasant it is for organisms to dwell together in unity! And, probably, how common it is in the biological world. This review concerns a dramatic association, one of the few that has been studied in detail: the nitrogen fixing symbiosis between certain plants and microbes Rhizobium bacteria stimulate leguminous plants to develop root nodules, which the bacteria infect and inhab...

How good and how pleasant it is for organisms to dwell together in unity! And, probably, how common it is in the biological world. This review concerns a dramatic association, one of the few that has been studied in detail: the nitrogen fixing symbiosis between certain plants and microbes Rhizobium bacteria stimulate leguminous plants to develop root nodules, which the bacteria infect and inhab...

Third party species, which interact with one or both partners of a pairwise species interaction, can shift the ecological costs and the evolutionary trajectory of the focal interaction. Shared genes that mediate a host's interactions with multiple partners have the potential to generate evolutionary constraints, making multi-player interactions critical to our understanding of the evolution of ...

The rhizobium-legume symbiosis has been widely studied as the model of mutualistic evolution and the essential component of sustainable agriculture. Extensive genetic and recent genomic studies have led to the hypothesis that many distinct strategies, regardless of rhizobial phylogeny, contributed to the varied rhizobium-legume symbiosis. We sequenced 26 genomes of Sinorhizobium and Bradyrhizob...

The early steps of symbiotic nodule formation by Rhizobium on plants require coordinate expression of several nod gene operons, which is accomplished by the activating protein NodD. Three different NodD proteins are encoded by Sym plasmid genes in Rhizobium meliloti, the alfalfa symbiont. NodD1 and NodD2 activate nod operons when Rhizobium is exposed to host plant inducers. The third, NodD3, is...

The pot experiments were conducted in the Department of Life Science and Bioinformatics of Assam University, Silchar. The aim of the present study was to investigate the effect of dual inoculation of Arbuscular mycorrhiza (AM) (Glomus fasciculatum) and Rhizobium on the chlorophyll, nitrogen and phosphorus contents of pigeon pea (Cajanus cajan L.). The results revealed an overall increase in chl...

In field peas, ascochyta blight is one of the most common fungal diseases caused by Didymella pinodes. Despite the high diversity of pea cultivars, only little resistance has been developed until to date, still leading to significant losses in grain yield. Rhizobia as plant growth promoting endosymbionts are the main partners for establishment of symbiosis with pea plants. The key role of Rhizo...

Minute 3. New taxa. New taxa described since the last meeting on 4 July 2001 are Bradyrhizobium yuanmingense Yao et al. [Int J Syst Evol Microbiol 52 (2002), 2219–2230], Bradyrhizobium betae Rivas et al. [Int J Syst Evol Microbiol 54 (2004), 1271–1275], Rhizobium indigoferae Wei et al. [Int J Syst Evol Microbiol 52 (2002), 2231–2239], Rhizobium loessense Wei et al. [Int J Syst Evol Microbiol 53...