ARS | Publication request: The Role of 2,4-diacetylphloroglucinol- and phenazine-1-carboxylic acid-producing Pseudomonas spp. in Natural Protection of Wheat from Soilborne Pathogens

Submitted to: Book Chapter
Publication Type: Book / Chapter
Publication Acceptance Date: February 17, 2012
Publication Date: April 2, 2012
Citation: Mavrodi, D.V., Mavrodi, O.V., Parejko, J.A., Thomashow, L.S., Weller, D.M. 2012. The Role of 2,4-diacetylphloroglucinol- and phenazine-1-carboxylic acid-producing Pseudomonas spp. in Natural Protection of Wheat from Soilborne Pathogens. Book Chapter. 267-284.

Interpretive Summary: Certain kinds of bacteria called fluorescent Pseudomonas isolated from the rhizosphere of diverse plants have been studied as biocontrol agents of soilborne pathogens worldwide. Some strains of these bacteria are capable of exerting a variety of mechanisms of plant growth promotion and protection, including the production of the natural antibiotics 2,4-diacetylphloroglucinol (2,4-DAPG) and derivatives of phenazine (Phz). These compounds are broadly active against plant pathogens and are produced by widely distributed and diverse Pseudomonas spp. that inhabit the roots of cereal crops and render certain soils naturally suppressive to soilborne plant pathogens. There is mounting evidence that the role of 2,4-DAPG and phenazines in the rhizosphere is not limited to antibiosis but also involves regulatory and signaling functions, induction of plants’ own resistance systems, and the chemical reduction of minerals in soil, making the minerals more biologically available.

Technical Abstract: Fluorescent Pseudomonas isolated from the rhizosphere of diverse plants have been studied as biocontrol agents of soilborne pathogens worldwide. Certain strains of these bacteria are capable of exerting a variety of mechanisms of plant growth promotion and protection, including the production of the natural antibiotics 2,4-diacetylphloroglucinol (2,4-DAPG) and derivatives of phenazine (Phz). These compounds are broadly active against plant pathogens and are produced by widely distributed and taxonomically diverse Pseudomonas spp. that inhabit the rhizosphere of cereal crops and render certain soils naturally suppressive to soilborne plant diseases. There is mounting evidence that the role of 2,4-DAPG and phenazines in the rhizosphere is not limited to antibiosis but also involves regulatory and signaling functions, induction of systemic resistance, and reduction of minerals in soil.