PROTEOBACTERIA >> Alpha >> Sinorhizobium >> Sinorhizobium meliloti
SINORHIZOBIUM MELILOTI
| Class: | Alpha Proteobacteria |
| Genus: | Sinorhizobium |
| Species: | Sinorhizobium meliloti |
| Description: | Sinorhizobium meliloti is a Gram-negative nitrogen-fixing bacterium (rhizobium). It forms a symbiotic relationship with legumes from the genera Medicago, Melilotus and Trigonella, including the model legume Medicago truncatula. This symbiosis results in a new plant organ termed a root nodule. The S. meliloti genome contains three replicons: a chromosome (~3.7 megabases) and two chromids, pSymA (~1.4 megabases) and pSymB (~1.7 megabases). Five S. meliloti genomes have been sequenced to date: Rm1021, AK83, BL225C,Rm41,and SM11.This organism, much like other Rhizobia, forms a symbiotic relationship with a leguminous plant, in this case the alfalfa plant (Medicago sativa). The bacterium recognizes plant flavonoid compounds, which turn on nodulation genes. Expression of nodulation genes results in production of a nodulation signal which the plant cell recognizes inducing root nodule formation. The bacterium is endocytosed and remains in a membrane-bound vesicle where it differentiates into a nitrogen-fixing bacteroid. The plant cell provides carbon compounds for the bacterium to grow on. |
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| Genbank: | NC_003047.1 [Genome] [Nucleotide] |
| Size (Mb): | 3.65 |
| GC %: | 62.7 |
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| Reference: | DE LAJUDIE (P.), WILLEMS (A.), POT (B.), DEWETTINCK (D.), MAESTROJUAN (G.), NEYRA (M.), COLLINS (M.D.), DREYFUS (B.), KERSTERS (K.) and GILLIS (M.): Polyphasic taxonomy of rhizobia: emendation of the genus Sinorhizobium and description of Sinorhizobium meliloti comb. nov., Sinorhizobium saheli sp. nov., and Sinorhizobium teranga sp. nov. Int. J. Syst. Bacteriol., 1994, 44, 715-733. |
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