Hydrogen sulfide enhances salt tolerance in tomato by regulating cell wall degradation in a SlSR3-dependent manner

文献类型： 外文期刊

第一作者： Chen, Huan

作者： Chen, Huan;Wu, Xuetong;Fang, Hua;Liu, Xingping;Kang, Jingtao;Liao, Weibiao;Feng, Li

作者机构：

关键词： Salt stress; Sodium hydrosulfide; Calcium ions; Cell wall metabolism

期刊名称：ENVIRONMENTAL AND EXPERIMENTAL BOTANY （ 影响因子：4.7； 五年影响因子：5.4 ）

ISSN： 0098-8472

年卷期： 2025 年 237 卷

页码：

收录情况： SCI

摘要： Soil salinization is an important abiotic stress that limits the productivity and quality of horticultural crops. As critical signaling molecules, hydrogen sulfide (H2S) and calcium ions (Ca2 +) are crucial in plant stress reponse. However, the molecular basis of their synergistic action in improving salt tolerance in plants is unclear. In this study, tomato (Solanum lycopersicum L.) seedlings were utilized as a material to explore the synergistic effect of H2S and Ca2+ on salt stress tolerance. The results show that exogenous sodium hydrosulfide (NaHS, a H2S donor) and CaCl2 independently ameliorated the inhibitory effects of salt stress on tomato seedling growth, with their co-application demonstrating a synergistic alleviation of stress-induced growth impairment. Further studies reveal that H2S promoted Ca2+ level and up-regulated signal-responsive 3 (SR3) expression. SlSR3 knockout mutants were more sensitive to salt stress, whereas overexpression of SlSR3 displayed enhanced salt tolerance. Moreover, SlSR3 conferred protection against salt stress-induced cell wall degradation and sustained its stability by repressing the expression of genes implicated in cell wall degradation. Further results demonstrate that NaHS treatment did not enhance cell wall integrity or salt tolerance in SlSR3 knockout mutants. Conversely, NaHS treatment effectively inhibited cell wall degradation and improved salt tolerance in SlSR3-overexpressing plants. Therefore, SlSR3 is likely implicated in the H2S-mediated inhibition of cell wall degradation in tomato seedlings under salt stress, ultimately enhancing salt tolerance. This study delineates the mechanistic interplay between H2S and Ca2+ in plant salt tolerance, thereby enhancing the potential for breeding horticultural crops with improved stress resilience.

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