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Integrated genomic and mutagenesis analysis of Pseudomonas argentinensis SA190 reveals mechanisms of plant root colonization and stress resilience
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Integrated genomic and mutagenesis analysis of Pseudomonas argentinensis SA190 reveals mechanisms of plant root colonization and stress resilience
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Journal Article
Integrated genomic and mutagenesis analysis of Pseudomonas argentinensis SA190 reveals mechanisms of plant root colonization and stress resilience
2025
Overview
Background
Pseudomonas argentinensis
SA190 is a desert-adapted, plant-associated bacterium with demonstrated potential to enhance plant growth under abiotic stress. In this study, we conducted a comprehensive genomic and functional characterization of SA190 to uncover the molecular mechanisms underlying its biofilm formation, root colonization, and plant growth-promoting traits.
Results
The SA190 genome consists of a single circular chromosome (5.07 Mb, 64% GC) encoding 4561 predicted ORFs. Functional annotation revealed genes related to phosphate solubilization (
pqq
operon), antifungal activity, and stress mitigation, including ACC deaminase. AntiSMASH analysis identified eight biosynthetic gene clusters linked to secondary metabolite production, including siderophores, terpenes, and β-lactones. Metabolic profiling demonstrated selective utilization of root exudate-associated sugars, consistent with rhizosphere adaptation. By a Tn5 transposon mutagenesis approach, we identified key regulators required for biofilm formation. Biofilm mutants deficient in
wspC
,
rpoE
, and
fliD
were differentially compromised in plant colonization and plant growth promotion under ambient and/or drought conditions.
Conclusion
Our study suggests that SA190 is a metabolically streamlined yet ecologically versatile PGPB and provides functional insights into its potential application as a bioinoculant for sustainable agriculture in arid environments.
Publisher
BioMed Central,BioMed Central Ltd,BMC
