Journal
PLANTS-BASEL
Volume 10, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/plants10081530
Keywords
plant growth-promoting rhizobacteria; priming; Phytophthora capsici; metabolic reprogramming; tomato; ultra-high performance liquid chromatography; mass spectrometry; tandem mass spectrometry
Categories
Funding
- South African National Research Foundation [95818]
Ask authors/readers for more resources
PGPR-induced metabolic reprogramming in tomato plants showed differential responses to Ph. capsici between Ps. fluorescens and Pa. alvei pre-treated plants. Abscisic acid and methyl salicylic acid were identified as major signaling molecules in the tripartite interaction. LC-MS metabolomics analysis revealed time-dependent metabolic changes between primed-unchallenged and primed-challenged tissues.
Plant growth-promoting rhizobacteria (PGPR) can stimulate disease suppression through the induction of an enhanced state of defense readiness. Here, untargeted ultra-high performance liquid chromatography-mass spectrometry (UHPLC-MS) and targeted ultra-high performance liquid chromatography coupled to triple-quadrupole mass spectrometry (UHPLC-QqQ-MS) were used to investigate metabolic reprogramming in tomato plant tissues in response to priming by Pseudomonas fluorescens N04 and Paenibacillus alvei T22 against Phytophthora capsici. Roots were treated with the two PGPR strains prior to stem inoculation with Ph. capsici. Metabolites were methanol-extracted from roots, stems and leaves at two-eight days post-inoculation. Targeted analysis by UHPLC-QqQ-MS allowed quantification of aromatic amino acids and phytohormones. For untargeted analysis, UHPLC-MS data were chemometrically processed to determine signatory biomarkers related to priming against Ph. capsici. The aromatic amino acid content was differentially reprogrammed in Ps. fluorescens and Pa. alvei primed plants responding to Ph. capsici. Furthermore, abscisic acid and methyl salicylic acid were found to be major signaling molecules in the tripartite interaction. LC-MS metabolomics analysis showed time-dependent metabolic changes in the primed-unchallenged vs. primed-challenged tissues. The annotated metabolites included phenylpropanoids, benzoic acids, glycoalkaloids, flavonoids, amino acids, organic acids, as well as oxygenated fatty acids. Tissue-specific reprogramming across diverse metabolic networks in roots, stems and leaves was also observed, which demonstrated that PGPR priming resulted in modulation of the defense response to Ph. capsici infection.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available