Chemotaxis of Rhizobium meliloti towards nodulation gene-inducing compounds from alfalfa roots

Article Abstract:

Nodulation (nod) gene inducers secreted by alfalfa roots are chemotactic to Rhizobium meliloti cells. This is similar to the response obtained using luteolin, a flavone, found in alfalfa seed extracts. This attraction could serve as a mechanism to bring R. meliloti cells to areas with high inducer concentrations, thereby amplifying nod gene induction. It could also serve to enhance growth by attracting cells to areas of high nutrient content. Even though both have the same biochemical specificity, the mechanism behind this chemotaxis appears distinct from that of nod gene induction.

Alfalfa

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Tn5-induced and spontaneous switching of Sinorhizobium meliloti to faster-swarming behavior

Article Abstract:

The Tn5 mutants of Sinorhizobium meliloti RMB7201 that swarmed 1.5 to 2.5 times faster than the parental strain in semisolid agar, moist sand and viscous liquid have been isolated and identified. The mutants outgrew the wild type strain 30- to 40-fold within 2 days. They also survived and grew better than the wild strain under all testing conditions except in a soil matrix subjected to air drying. It has been discovered that the swarming behavior is influenced by spontaneous and high-frequency switching between normal and faster-swarming activities.

Gene mutations, Gene mutation, Genetic aspects, Bacterial genetics

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Starvation-induced changes in motility, chemotaxis, and flagellation of Rhizobium meliloti

Article Abstract:

Three strains of Rhizobium meliloti, a nitrifying bacteria that nodulates alfalfa, were used in the investigation of the motility response of the bacteria to starvation. In particular, the effect of a medium that lacks carbon, nitrogen and phosphate sources on motility, chemotactic response and flagellation, the interaction among these parameters and variation in the response to starvation are examined.

Physiological aspects, Bacteria, Culture media (Biology), Composition, Culture media, Flagella (Microbiology), Flagella, Bacterial motility

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