ArticleMolecular plant pathology2018
Polyamine is a critical determinant of Pseudomonas chlororaphis O6 for GacS-dependent bacterial cell growth and biocontrol capacity.
Article in Molecular plant pathology, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.
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16 citing papers in PubMed, 26 citations in OpenAlex.
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- Comparison of freeze-thaw and sonication cycle-based methods for extracting AMR-associated metabolites fromFrontiers in microbiology · 2023Article
- Transcriptome analysis provides insights into the molecular mechanism of GhSAMDCScientific reports · 2022Article
- Root-Associated Bacteria Are Biocontrol Agents for Multiple Plant Pests.Microorganisms · 2022Review
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- Dietary Concentrate-to-Forage Ratio Affects Rumen Bacterial Community Composition and Metabolome of Yaks.Frontiers in nutrition · 2022Article
- Extremophilic bacteria restrict the growth ofBiotechnology reports (Amsterdam, Netherlands) · 2021Article
- The Evanescent GacS Signal.Microorganisms · 2020Review
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- Polyamine Oxidases Play Various Roles in Plant Development and Abiotic Stress Tolerance.Plants (Basel, Switzerland) · 2019Review
- Rhizosphere pseudomonads as probiotics improving plant health.Molecular plant pathology · 2018Review
- Hydrogen Cyanide Produced byThe plant pathology journal · 2018Article
- Spermidine-Regulated Biosynthesis of Heat-Stable Antifungal Factor (HSAF) inFrontiers in microbiology · 2018Article
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Authors and funding
5 authors at 3 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The Gac/Rsm network regulates, at the transcriptional level, many beneficial traits in biocontrol-active pseudomonads. In this study, we used Phenotype MicroArrays, followed by specific growth studies and mutational analysis, to understand how catabolism is regulated by this sensor kinase system in the biocontrol isolate Pseudomonas chlororaphis O6. The growth of a gacS mutant was decreased significantly relative to that of the wild-type on ornithine and arginine, and on the precursor of these amino acids, N-acetyl-l-glutamic acid. The gacS mutant also showed reduced production of polyamines. Expression of the genes encoding arginine decarboxylase (speA) and ornithine decarboxylases (speC) was controlled at the transcriptional level by the GacS sensor of P. chlororaphis O6. Polyamine production was reduced in the speC mutant, and was eliminated in the speAspeC mutant. The addition of exogenous polyamines to the speAspeC mutant restored the in vitro growth inhibition of two fungal pathogens, as well as the secretion of three biological control-related factors: pyrrolnitrin, protease and siderophore. These results extend our knowledge of the regulation by the Gac/Rsm network in a biocontrol pseudomonad to include polyamine synthesis. Collectively, our studies demonstrate that bacterial polyamines act as important regulators of bacterial cell growth and biocontrol potential.
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