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Proteome IDiUP000000246
Taxonomy288000 - Bradyrhizobium sp. (strain BTAi1 / ATCC BAA-1182)
StrainBTAi1 / ATCC BAA-1182
Last modifiedFebruary 27, 2018
Genome assembly and annotationi GCA_000015165.1 from ENA/EMBL
Pan proteomei This proteome is part of the Bradyrhizobium sp. (strain ORS 278) pan proteome (fasta)

Bradyrhizobium sp. strain BTAi1, a photosynthetic bacterium, nodulates the stems of the aquatic legume Aeschynomene indica, and was isolated in North America. Group I Bradyrhizobium form nodules on all stem-nodulating Aeschynomene species, and are known to contain the nodulation-inducing nodABC genes, whereas group II strains (among them strain BTAi1) are restricted to a few species. The photosynthetic Bradyrhizobia form a separate phylum and may be closer to Rhodopseudomonas than to non-photosynthetic Bradyrhizobia. Unlike the closely related Bradyrhizobium sp. strain ORS278 (BRASO), strain BTAi1 has a 230kb plasmid. There are no nod, nif or fix genes in BTAi1, which therefore must initiate nodulation in a quite different fashion than the nod-containing nitrogen-fixing bacteria. Despite this absence, nodules on Aeschynomene synthesize leghemoglobin, have nitrogenase activity and transfer fixed N2 into the plant host. Interestingly, these photosynthetic Bradyrhizobia naturally associate with a wild rice species, Oryza breviligulata that co-inhabits some tropical marshes of Africa with Aeschynomenes. Association with BTAi1 increases production slightly. Strain BTAi1 produces the carotenoid spirilloxanthin (supplementary information from PubMed 11097925).


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Component nameGenome Accession(s)
Plasmid pBBta01223

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