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• W2802847850 abstract "Abstract High-temperature (HT) stress is a major environmental stress that limits plant growth and development. MAPK cascades play key roles in plant growth and stress signaling, but their involvement in the HT stress response is poorly understood. Here, we describe a 47-kD MBP-phosphorylated protein (p47-MBPK) activated in tomato (Solanum lycopersicum) leaves under HT and identify it as SlMPK1 by tandem mass spectrometry analysis. Silencing of SlMPK1 in transgenic tomato plants resulted in enhanced tolerance to HT, while overexpression resulted in reduced tolerance. Proteomic analysis identified a set of proteins involved in antioxidant defense that are significantly more abundant in RNA interference-SlMPK1 plants than nontransgenic plants under HT stress. RNA interference-SlMPK1 plants also showed changes in membrane lipid peroxidation and antioxidant enzyme activities. Furthermore, using yeast two-hybrid screening, we identified a serine-proline-rich protein homolog, SlSPRH1, which interacts with SlMPK1 in yeast, in plant cells, and in vitro. We demonstrate that SlMPK1 can directly phosphorylate SlSPRH1. Furthermore, the serine residue serine-44 of SlSPRH1 is a crucial phosphorylation site in the SlMPK1-mediated antioxidant defense mechanism activated during HT stress. We also demonstrate that heterologous expression of SlSPRH1 in Arabidopsis (Arabidopsis thaliana) led to a decrease in thermotolerance and lower antioxidant capacity. Taken together, our results suggest that SlMPK1 is a negative regulator of thermotolerance in tomato plants. SlMPK1 acts by regulating antioxidant defense, and its substrate SlSPRH1 is involved in this pathway." @default.
• W2802847850 created "2018-05-17" @default.
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• W2802847850 date "2018-04-20" @default.
• W2802847850 modified "2023-10-03" @default.
• W2802847850 title "The Tomato Mitogen-Activated Protein Kinase SlMPK1 Is as a Negative Regulator of the High-Temperature Stress Response" @default.
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• W2802847850 doi "https://doi.org/10.1104/pp.18.00067" @default.
• W2802847850 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6001329" @default.
• W2802847850 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29678861" @default.
• W2802847850 hasPublicationYear "2018" @default.
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