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Phloroglucinol Derivatives in Plant-Beneficial Pseudomonas spp.: Biosynthesis, Regulation, and Functions

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METABOLITES
卷 11, 期 3, 页码 -

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MDPI
DOI: 10.3390/metabo11030182

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2,4-diacetylphloroglucinol; DAPG; Pseudomonas; biocontrol; antibiotic

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Plant-beneficial Pseudomonas spp. aggressively colonize the rhizosphere and produce secondary metabolites like DAPG, which has broad-spectrum antimicrobial activity and contributes to disease suppression. This review discusses the biosynthesis, regulation, and role of phloroglucinol derivatives in Pseudomonas, including their mode of action as antibiotics, signaling molecules, and potential pathogenicity factors. The genetic and genomic diversity of DAPG-producing Pseudomonas spp. and its importance for enhancing biocontrol of plant pathogens are also explored.
Plant-beneficial Pseudomonas spp. aggressively colonize the rhizosphere and produce numerous secondary metabolites, such as 2,4-diacetylphloroglucinol (DAPG). DAPG is a phloroglucinol derivative that contributes to disease suppression, thanks to its broad-spectrum antimicrobial activity. A famous example of this biocontrol activity has been previously described in the context of wheat monoculture where a decline in take-all disease (caused by the ascomycete Gaeumannomyces tritici) has been shown to be associated with rhizosphere colonization by DAPG-producing Pseudomonas spp. In this review, we discuss the biosynthesis and regulation of phloroglucinol derivatives in the genus Pseudomonas, as well as investigate the role played by DAPG-producing Pseudomonas spp. in natural soil suppressiveness. We also tackle the mode of action of phloroglucinol derivatives, which can act as antibiotics, signalling molecules and, in some cases, even as pathogenicity factors. Finally, we discuss the genetic and genomic diversity of DAPG-producing Pseudomonas spp. as well as its importance for improving the biocontrol of plant pathogens.

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