Metabolome and transcriptome reprogramming underlying tomato drought resistance triggered by a Pseudomonas strain

生物 代谢组 代谢组学 转录组 耐旱性 代谢途径 恶臭假单胞菌 根际细菌 WRKY蛋白质结构域 生物化学 植物 基因 遗传学 根际 基因表达 细菌 生物信息学
作者
Αναστασία Παπαδοπούλου,Aggeliki Ainalidou,Ιfigeneia Mellidou,Katerina Karamanoli
出处
期刊:Plant Physiology and Biochemistry [Elsevier]
卷期号:203: 108080-108080 被引量:5
标识
DOI:10.1016/j.plaphy.2023.108080
摘要

Although amelioration of drought stress by Plant Growth Promoting Rhizobacteria (PGPR) is a well-documented phenomenon, the combined molecular and metabolic mechanisms governing this process remain unclear. In these lines, the present study aimed to provide new insights in the underlying drought attenuating mechanisms of tomato plants inoculated with a PGP Pseudomonas putida strain, by using a combination of metabolomic and transcriptomic approaches. Following Differentially Expressed Gene analysis, it became evident that inoculation resulted in a less disturbed plant transcriptome upon drought stress. Untargeted metabolomics highlighted the differential metabolite accumulation upon inoculation, as well as the less metabolic reprograming and the lower accumulation of stress-related metabolites for inoculated stressed plants. These findings were in line with morpho-physiological evidence of drought stress mitigation in the inoculated plants. The redox state modulation, the more efficient nitrogen assimilation, as well as the differential changes in amino acid metabolism, and the induction of the phenylpropanoid biosynthesis pathway, were the main drought-attenuating mechanisms in the SAESo11-inoculated plants. Shifts in pathways related to hormonal signaling were also evident upon inoculation at a transcript level and in conjunction with carbon metabolism regulation, possibly contributed to a drought-attenuation preconditioning. The identified signatory molecules of SAESo11-mediated priming against drought included aspartate, myo-inositol, glutamate, along with key genes related to trehalose, tryptophan and cysteine synthesis. Taken together, SAESo11-inoculation provides systemic effects encompassing both metabolic and regulatory functions, supporting both seedling growth and drought stress amelioration.
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