Project description:Mesembryanthemum crystallinum (common ice plant) is one of the facultative halophyte plants, and it serves as a model for investigating the molecular mechanisms underlying its salt stress response and tolerance. Here we cloned one of homeobox transcription factor (TF) gene McHB7 from ice plant, which has 60% similarity with the Arabidopsis AtHB7. Overexpression of McHB7 in Arabidopsis (OE) showed that the plants had significantly elevated relative water content (RWC), chlorophyll content, superoxide dismutase (SOD) and peroxidase (POD) activities after salt stress treatment. Proteomics analysis identified 145 to be significantly changed in abundance, and 66 were exclusively increased in the OE plants compared to wild type (WT). After salt treatment, 979 and 959 metabolites were significantly increased and decreased in OE plants compared to the WT, respectively. The results demonstrated McHB7 can improve photosynthesis and increase the leaf chlorophyll content, and affect TCA cycle by regulating metabolites (e.g., pyruvate) and proteins (e.g., citrate synthase). Also, McHB7 modulates the expression of stress-related proteins (e.g., superoxide dismutase, dehydroascorbate reductase and pyrroline-5-carboxylate synthase B) to scavenge reactive oxygen species and enhance plant salt tolerance.

2022-08-11 | PXD033886 | Pride

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