Journal
PLASMID
Volume 68, Issue 3, Pages 149-158Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.plasmid.2012.07.002
Keywords
Plasmids; Plasmid instability; Symbiotic plasmids; Rhizobium; Sinorhizobium; Ensifer
Categories
Funding
- PAPIIT (UNAM) [IN200709, IN205412]
- Consejo Nacional de Ciencia y Tecnologia (CONACyT) fellowship
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In bacteria, niche adaptation may be determined by mobile extrachromosomal elements. A remarkable characteristic of Rhizobium and Ensifer (Sinorhizobium) but also of Agrobacterium species is that almost half of the genome is contained in several large extrachromosomal replicons (ERs). They encode a plethora of functions, some of them required for bacterial survival, niche adaptation, plasmid transfer or stability. In spite of this, plasmid loss is common in rhizobia upon subculturing. Rhizobial gene-expression studies in plant rhizospheres with novel results from transcriptomic analysis of Rhizobium phaseoli in maize and Phaseolus vulgaris roots highlight the role of ERs in natural niches and allowed the identification of common extrachromosomal genes expressed in association with plant rootlets and the replicons involved. (C) 2012 Elsevier Inc. All rights reserved.
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