Combined Proteomics and Metabolism Analysis Unravels Prominent Roles of Antioxidant System in the Prevention of Alfalfa (Medicago sativa L.) against Salt Stress.

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To unravel the potential molecular mechanism involved in salt tolerance in alfalfa, we accomplished a combined analysis of parallel reaction monitoring-based proteomic technique and targeted metabolism. Based on proteomic analysis, salt stress induced 226 differentially abundant proteins (DAPs). Among them, 118 DAPs related to the antioxidant system, including glutathione metabolism and oxidation-reduction pathways, were significantly up-regulated. Data are available via ProteomeXchange with identifier PXD017166. Overall, 107 determined metabolites revealed that the tricarboxylic acid (TCA) cycle, especially the malate to oxaloacetate conversion step, was strongly stimulated by salt stress. This leads to an up-regulation by about 5 times the ratio of NADPH/NADP+, as well as about 3 to 5 times in the antioxidant enzymes activities, including those of catalase and peroxidase and proline contents. However, the expression levels of DAPs related to the Calvin-Benson-Bassham (CBB) cycle and photorespiration pathway were dramatically inhibited following salt treatment. Consistently, metabolic analysis showed that the metabolite amounts related to carbon assimilation and photorespiration decreased by about 40% after exposure to 200 mM NaCl for 14 d, leading ultimately to a reduction in net photosynthesis by around 30%. Our findings highlighted also the importance of the supplied extra reducing power, thanks to the TCA cycle, in the well-functioning of glutathione to remove and scavenge the reactive oxygen species (ROS) and mitigate subsequently the oxidative deleterious effect of salt on carbon metabolism including the CBB cycle.", "claims": [{"id": "claim-method", "statement": "One-way ANOVA was used to determine the significant differences among different NaCl concentrations.", "kind": "methodological", "target": null, "evidence": [{"asset": "source:pmid:32019165", "locator": "sections[4] \"2.2. 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Stars mean significance levels: *** p ≤ 0.001, ** p ≤ 0.01, * p ≤ 0.05.", "structure": {"pmcid": "PMC7037825", "section_index": 3, "section_title": "2.1. Physiological Performance of Alfalfa Exposed to Salt Stress", "row_count": 10, "column_count": 4}, "table": {"label": "Table 1", "caption": "Interactive effects of salt stress magnitude and its duration on physiological level and the activities of antioxidant enzymes in alfalfa leaves subjected to 200 mM NaCl for 14 d, via two-way ANOVA. 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