Abstract
Rhizobium leguminosarum bv. trifolii WSM2012 (syn. MAR1468) is an aerobic, motile, Gram-negative, non-spore-forming rod that was isolated from an ineffective root nodule recovered from the roots of the annual clover Trifolium rueppellianum Fresen growing in Ethiopia. WSM2012 has a narrow, specialized host range for N2-fixation. Here we describe the features of R. leguminosarum bv. trifolii strain WSM2012, together with genome sequence information and annotation. The 7,180,565 bp high-quality-draft genome is arranged into 6 scaffolds of 68 contigs, contains 7,080 protein-coding genes and 86 RNA-only encoding genes, and is one of 20 rhizobial genomes sequenced as part of the DOE Joint Genome Institute 2010 Community Sequencing Program.
Highlights
IntroductionAtmospheric dinitrogen (N2) is fixed by specialized soil bacteria (root nodule bacteria or rhizobia) that form non-obligatory symbiotic relationships with legumes
Atmospheric dinitrogen (N2) is fixed by specialized soil bacteria that form non-obligatory symbiotic relationships with legumes
The complex, highly-evolved legume symbioses involve the formation of specialized root structures as a consequence of a tightly controlled mutual gene regulated infection process that results in substantial morphological changes in both the legume host root and infecting rhizobia [1]
Summary
Atmospheric dinitrogen (N2) is fixed by specialized soil bacteria (root nodule bacteria or rhizobia) that form non-obligatory symbiotic relationships with legumes. When housed within root nodules, fully effective N2-fixing bacteroids (the N2-fixing form of rhizobia) can provide 100% of the nitrogen (N) requirements of the legume host by symbiotic N2-fixation. N2-fixation provides ~40 million tonnes of nitrogen (N) annually to support global food production from ~300 million hectares of crop, forage and pasture legumes in symbioses with rhizobia [2]. The most widely cultivated of the pasture legumes is the legume genus Trifolium (clovers). This genus inhabits three distinct centers of biodiversity with approximately 28% of species in the Americas, 57% in Eurasia and 15% in Sub-Saharan Africa [3]. Clovers usually form N2-fixing symbiosis with the common soil bacterium Rhizobium leguminosarum
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