IbMPK3/IbMPK6-mediated IbSPF1 phosphorylation promotes cold stress tolerance in sweet potato

文献类型： 外文期刊

第一作者： Park, Sul-U

作者： Park, Sul-U;Kwak, Sang-Soo;Kim, Ho Soo;Jung, Young Jun;Kwon, Hyo Jeong;Lee, Ji Yeon;An, Jonguk;Lee, Hyeong-Un;Jeong, Jae Cheol;Bian, Xiaofeng;Yu, Tao;Kim, Yun-Hee

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关键词： IbSPF1; Sweet poatato; Cold stress; IbMPK3/IbMPK6

期刊名称：BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS （ 影响因子：2.2； 五年影响因子：2.5 ）

ISSN： 0006-291X

年卷期： 2025 年 769 卷

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收录情况： SCI

摘要： Environmental stress caused by biotic and abiotic factors negatively affects crop quality and productivity. Plants employ multiple signaling mechanisms under stress, with the mitogen-activated protein kinase (MAPK) cascade-particularly MPK3 and MPK6-serving as a central regulator of stress adaptation through substrate phosphorylation. While these kinases are well-studied in model plants, their functional role in sweet potato [Ipomoea batatas (L.) Lam] remains poorly characterized. This study investigates how cold tolerance in sweet potato is modulated by IbMPK3/IbMPK6-mediated phosphorylation of the stress-responsive transcription factor IbSPF1 at Ser75 and Ser110. Wild-type and transgenic sweet potato plants were grown under normal and cold-stress conditions, followed by the assessment of IbSPF1 phosphorylation levels and plant physiological parameters. Notably, transgenic plants overexpressing IbSPF1 (IbSPF1DD) exhibited significantly higher tolerance to cold stress than non-transgenic plants under cold stress condition, which was attributed to an increase in photosynthetic efficiency and a decrease in lipid peroxidation. Compared with non-transgenic plants, transgenic IbSPF1DD plants showed significantly upregulated levels of cold-regulated genes. Conclusively, IbMPK3/IbMPK6-mediated phosphorylation of IbSPF1 plays an important role in cold stress signaling and tolerance in sweet potato.

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