Trifolitoxin production increases nodulation competitiveness of Rhizobium etli CE3 under agricultural conditions

Article Abstract:

The production of the antirhizobial peptide trifolitoxin (TFX) has been found to increase the nodulation competitiveness of both Rhizobium and Sinorhizobium strains under laboratory conditions. In an effort to determine its efficacy in field-grown plants, Rhizobium etli strains were inoculated onto seeds of the Phaseolus vulgaris. In addition, effects on grain yield were also determined. Results indicate that the TFX system greatly improves nodulation even under agricultural conditions. This has potential commercial applications in legume agriculture.

Rhizobium, Plant genetic engineering

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Effects of bacterial antibiotic production on rhizosphere microbial communities from a culture-independent perspective

Article Abstract:

A study was conducted to evaluate microbial diversity changes in the rhizosphere of bean plants after inoculation with bacterial strains that varied in the ability to generate a narrow-spectrum peptide antibiotic called trifolitoxin (TFX). Results indicated that TFX production had a significant influence on TFX-sensitive bacteria in the rhizosphere of beans. Findings also correlated the reduction in the diversity of alpha-Proteobacteria with TFX production.

Antibiotics, Bacteria, Peptides, Rhizosphere, Beans

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Inoculation with Sinorhizobium meliloti RMBPC-2 increases alfalfa yield compared with inoculation with a nonengineered wild-type strain

Article Abstract:

The inoculation of alfalfa seeds with any of the three recombinant strains RMBPC-2, RMB7240 and RMB7201 of Sinorhizobium meliloti increased the plant biomass in contrast to inoculation with the wild-type strains. A high proportion of the inoculum strains were present in the nodules throughout the three-year study period. The insertion of these strains in the P3 site, dctABD and 2 (dctA) decreased the yield.

Analysis, Alfalfa, Grain seeds, Plant biomass

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