Stabilization of Rhizobium symbiosis plasmids

Article Abstract:

The capacity of Rhizobium sp. NGR234 to be involved in symbiosis is regulated by a symbiotic plasmid. This plasmid has genes necessary for symbiosis. However, the retention of such a large plasmid without obvious selection demands a mechanism for plasmid stabilization. The preservation of low-copy-number plasmids is accomplished in three possible ways. These are the active distribution of the plasmid to daughter cells at cell division, the resolution of plasmid oligomers to monomers and the post-segregational killing of plasmid-free daughter cells.

Symbiosis, Plasmids

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Nitrogen limitation of chemostat-grown Rhizobium etli elicits higher infection-thread formation in Phaseolus vulgaris

Article Abstract:

Rhizobium etli cells grown in a chemostat under nitrogen (N) -limited conditions are more infective than cells grown under carbon (C) -limited conditions, as they induce greater infection-thread formation in Phaseolus vulgaris. The N-limited and C-limited cells differ in their short lipopolysaccharide composition and exopolysaccharide (EPS) content. The greater infectivity of the N-limited cells is probably due to their higher EPS content. The N-limited cells induce more infection-threads than R. etli cells in the exponential growth phase.

Physiological aspects, Nitrogen (Chemical element), Nitrogen

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A stomatin-like protein encoded by the sip gene of Rhizobium etli is required for nodulation competitiveness on the common bean

Article Abstract:

A novel gene, slp, was isolated from Rhizobium etli strain TAL182 which is required for nodulation competition on the common bean. The slp knock-out mutant of TAL182 shows defective nodulation competition, reduced growth in the presence of 200 mM NaCI, KCI or LiCI. There is a similarity to stomatin proteins of Homo sapiens, Caenorhabditis elegans and Mus musculus. Slp is absent in R. tropici type B strains.

Proteins, Legumes

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