An energy taxis transducer promotes root colonization by Azospirillum brasilense.

Energy taxis is the dominant behavior in Azospirillum brasilense.

Energy taxis encompasses aerotaxis, phototaxis, redox taxis, taxis to alternative electron acceptors, and chemotaxis to oxidizable substrates. The signal for this type of behavior is originated within the electron transport system. Energy taxis was demonstrated, as a part of an overall behavior, in several microbial species, but it did not appear as the dominant determinant in any of them. In t...

Enhancement of Wheat Root Colonization and Plant Development by Azospirillum brasilense Cd. Following Temporary Depression of Rhizosphere Microflora.

Inoculation of wheat with Azospirillum brasilense, combined with the application of four fungal and bacterium-inhibiting substances to which A. brasilense is resistant in the soil, decreased the rhizosphere population, while it increased wheat root colonization by A. brasilense, even in cases of poor inoculation. The inoculation significantly increased the following wheat plant parameters as we...

Root-surface colonization of black mangrove seedlings by Azospirillum halopraeferens and Azospirillum brasilense in seawater

Inoculation of axenic black mangrove seedlings in seawater for 8 days with either the terrestrial halotolerant plant growthpromoting bacterium Azospirillum halopraeferens or with Azospirillum brasilense produced heavy colonization of the root surface. The colonization pattern was different for the two strains. A. halopraeferens yielded mainly single cells embedded in a thick sheath, whereas A. ...

Involvement of the Reserve Material Poly- -Hydroxybutyrate in Azospirillum brasilense Stress Endurance and Root Colonization

Root-to-Root Travel of the Beneficial Bacterium Azospirillum brasilense.

The root-to-root travel of the beneficial bacterium Azospirillum brasilense on wheat and soybean roots in agar, sand, and light-textured soil was monitored. We used a motile wild-type (Mot) strain and a motility-deficient (Mot) strain which was derived from the wild-type strain. The colonization levels of inoculated roots were similar for the two strains. Mot cells moved from inoculated roots (...