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Rhizobium is a genus of Gram-negative soil bacteria that fix nitrogen. Rhizobium species form an endosymbiotic nitrogen-fixing association with roots of legumes and Parasponia.
The Hyphomicrobiales are an order of Gram-negative Alphaproteobacteria.
Bradyrhizobium is a genus of Gram-negative soil bacteria, many of which fix nitrogen. Nitrogen fixation is an important part of the nitrogen cycle. Plants cannot use atmospheric nitrogen (N2); they must use nitrogen compounds such as nitrates.
Sinorhizobium/Ensifer is a genus of nitrogen-fixing bacteria (rhizobia), three of which have been sequenced.
Mesorhizobium is a genus of Gram-negative soil bacteria. At least one, the nitrogen fixing species, Mesorhizobium loti, forms symbiotic root nodules with plants in the genus Lotus. Strain MAFF303099 of M. japonicum has been fully sequenced.
Mesorhizobium loti, formerly known as Rhizobium loti, is a Gram negative species of bacteria found in the root nodules of many plant species. Its name is a reference to Lotus corniculatus, a flowering plant from which it was originally isolated.
Sinorhizobium fredii is a nitrogen fixing bacteria of the genus Sinorhizobium. It is a fast-growing root nodule bacteria. Sinorhizobium fredii exhibit a broad host-range and are able to nodulate both determinant hosts such as soy as well as indeterminate hosts including the pigeon pea. Because of their ease of host infection there is interest in their genetics and the symbiotic role in host infection and nodule formation.
Pararhizobium giardinii is a Gram negative root nodule bacteria. It forms nitrogen-fixing root nodules on legumes, being first isolated from those of Phaseolus vulgaris.
Rhizobium gallicum is a Gram-negative root-nodule bacterium. It forms nitrogen-fixing root nodules on legumes, being first isolated from those of Phaseolus vulgaris.
Mesorhizobium plurifarium is a species of root nodule bacteria first isolated from Acacia species in Senegal. Its type strain is ORS 1032.
Rhizobium hainanense is a Gram negative root nodule bacteria. Strain CCBAU 57015 (166) is the type strain.
Mesorhizobium amorphae is a species of root nodule bacteria first isolated from Amorpha fruticosa species in China. It is purported to be native to American soil. Its genome has been sequenced. Its type strain is ACCC 19665.
Rhizobium mongolense is a Gram negative root nodule bacteria, which nodulates and forms nitrogen-fixing symbioses with Medicago ruthenica. Its type strain is USDA 1844.
Neorhizobium huautlense is a Gram negative root nodule bacteria. It forms nitrogen-fixing root nodules on Sesbania herbacea.
Mesorhizobium ciceri is a gram-negative, nitrogen-fixing motile bacteria from the genus of Mesorhizobium which was isolated from Chickpea nodules of Cicer arietinum in Spain. Rhizobium cicero was transferred to Mesorhizobium ciceri.
Mesorhizobium huakuii is a bacterium from the genus Mesorhizobium which was isolated from the legume Astragalus sinicus in Nanjing in China. Rhizobium huakuii was transferred to Mesorhizobium huakuii.
Mesorhizobium mediterraneum is a bacterium from the genus Mesorhizobium, which was isolated from root nodule of the Chickpea in Spain. The species Rhizobium mediterraneum was subsequently transferred to Mesorhizobium mediterraneum. This species, along with many other closely related taxa, have been found to promote production of chickpea and other crops worldwide by forming symbiotic relationships.
Mesorhizobium qingshengii is a bacterium from the genus Mesorhizobium which was isolated from root nodules of Astragalus sinicus in the southeast of China.
Rhizobium indigoferae is a Gram negative root nodule bacteria, which nodulates and forms nitrogen-fixing symbioses with Indigofera species Its type strain is CCBAU 71714(T).
Sinorhizobium medicae is a species of gram-negative, nitrogen-fixing, rod-shaped bacteria. They can be free-living or symbionts of leguminous plants in root nodules. S.medicae was first isolated from root nodules on plants in the genus Medicago. Some strains of S.medicae, like WSM419, are aerobic. They are chemoorganotrophic mesophiles that prefer temperatures around 28 °C. In addition to their primary genome, these organisms also have three known plasmids, sized 1,570,951 bp, 1,245,408 bp and 219,313 bp.
References
- ↑ Jarvis, B. D. W., et al. "Transfer of Rhizobium loti, Rhizobium huakuii, Rhizobium ciceri, Rhizobium mediterraneum, and Rhizobium tianshanense to Mesorhizobium gen. nov." International Journal of Systematic Bacteriology 47.3 (1997): 895-898.
- ↑ Chen, W.; Wang, E.; Wang, S.; Li, Y.; Chen, X.; Li, Y. (1995). "Characteristics of Rhizobium tianshanense sp. nov., a Moderately and Slowly Growing Root Nodule Bacterium Isolated from an Arid Saline Environment in Xinjiang, People's Republic of China". International Journal of Systematic Bacteriology. 45 (1): 153–159. doi: 10.1099/00207713-45-1-153 . ISSN 0020-7713. PMID 7857795.
