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Signal transduction in plant-beneficial rhizobacteria with biocontrol properties.

  • Haas D Laboratoire de Biologie Microbienne, Université de Lausanne, Switzerland. Dieter.Haas@lbm.unil.ch
  • Keel C
  • Reimmann C
  • 2002-11-27
Published in:
  • Antonie van Leeuwenhoek. - 2002
Antibiosis
Bacterial Proteins
Fungi
Pest Control, Biological
Plant Diseases
Plant Roots
Pseudomonas fluorescens
Signal Transduction
English Biological control of root pathogens--mostly fungi--can be achieved by the introduction of selected bacterial inoculants acting as 'biopesticides'. Successful inoculants have been identified among Gram-negative and Gram-positive bacteria, often belonging to Pseudomonas spp. and Bacillus spp., respectively. Biocontrol activity of a model rhizobacterium, P. fluorescens CHAO, depends to a considerable extent on the synthesis of extracellular antimicrobial secondary metabolites and exoenzymes, thought to antagonize the pathogenicity of a variety of phytopathogenic fungi. The regulation of exoproduct formation in P. fluorescens (as well as in other bacteria) depends essentially on the GacS/GacA two-component system, which activates a largely unknown signal transduction pathway. However, recent evidence indicates that GacS/GacA control has a major impact on target gene expression at a post-transcriptional level, involving an mRNA target sequence (typically near the ribosome binding site), two RNA binding proteins (designated RsmA and RsmE), and a regulatory RNA (RsmZ) capable of binding RsmA. The expression and activity of the regulatory system is stimulated by at least one low-molecular-weight signal. The timing and specificity of this switch from primary to secondary metabolism are essential for effective biocontrol.
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  • English
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green
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https://sonar.ch/global/documents/290346
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