PMID: 11607544May 9, 1995Paper

Molecular mechanisms of defense by rhizobacteria against root disease

Proceedings of the National Academy of Sciences of the United States of America
R J CookD S Kim

Abstract

Genetic resistance in plants to root diseases is rare, and agriculture depends instead on practices such as crop rotation and soil fumigation to control these diseases. "Induced suppression" is a natural phenomenon whereby a soil due to microbiological changes converts from conducive to suppressive to a soilborne pathogen during prolonged monoculture of the susceptible host. Our studies have focused on the wheat root disease "take-all," caused by the fungus Gaeumannomyces graminis var. tritici, and the role of bacteria in the wheat rhizosphere (rhizobacteria) in a well-documented induced suppression (take-all decline) that occurs in response to the disease and continued monoculture of wheat. The results summarized herein show that antibiotic production plays a significant role in both plant defense by and ecological competence of rhizobacteria. Production of phenazine and phloroglucinol antibiotics, as examples, account for most of the natural defense provided by fluorescent Pseudomonas strains isolated from among the diversity of rhizobacteria associated with take-all decline. There appear to be at least three levels of regulation of genes for antibiotic biosynthesis: environmental sensing, global regulation that ties antibiot...Continue Reading

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Citations

Jun 13, 2006·Microbial Ecology·Jeffrey D PalumboNoreen E Mahoney
Sep 24, 2013·Nature Reviews. Microbiology·Laurent PhilippotWim H van der Putten
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