An Importin Protein SlIMPA3 Interacts with SlLCD1 and Regulates Tomato Fruit Ripening

文献类型： 外文期刊

第一作者： Zhang, Min

作者： Zhang, Min;Peng, Xiang-Jun;Liu, Nan-Nan;Lu, Zi-Xu;Zhao, Yu-Qi;Yao, Gai-Fang;Hu, Kang-Di;Zhang, Hua;Li, Juan;Xu, Rong-Fang

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关键词： antioxidant enzymes; fruit ripening; hydrogensulfide (H2S); importin; ROS homeostasis; tomato

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：6.2； 五年影响因子：6.4 ）

ISSN： 0021-8561

年卷期： 2025 年 73 卷 2 期

页码：

收录情况： SCI

摘要： A nuclear-localized cysteine desulfhydrase, LCD1, plays a crucial role in mediating endogenous hydrogen sulfide production in tomatoes. However, the mechanism underlying the nuclear localization of SlLCD1 is not yet fully understood. In this study, it was found that SlLCD1 specifically interacted with nuclear import receptor importin alpha 3 (SlIMPA3). Furthermore, it was demonstrated that silencing SlIMPA3 through virus-induced gene silencing or introducing mutations in SlIMPA3 via CRISPR/Cas9 significantly accelerated fruit ripening. Moreover, enhanced chlorophyll degradation, carotenoid accumulation, and premature upregulation of ripening-associated genes in the slimpa3 mutant indicated SlIMPA3 to be a negative regulator of fruit ripening and leaf senescence. Besides, SlIMPA3 deletion resulted in excessive hydrogen peroxide accumulation in fruits and leaves, potentially leading to premature leaf senescence and accelerated fruit ripening in the slimpa3 mutant. SlIMPA3 exhibited pronounced nuclear localization with weak distribution in the cytoplasm. SlLCD1 showed specific nuclear localization; however, after GFP tagging in slimpa3-edited tomato leaves, it migrated to the cytoplasm, suggesting that SlIMPA3 mediated the nuclear localization of SlLCD1. SlLCD1 transient expression in slimpa3 mutant fruits indicated that it did not inhibit tomato ripening following the SlIMPA3 mutation. In summary, our study revealed that SlIMPA3 interacted with SlLCD1 to facilitate its nuclear entry. Mutations in SlIMPA3 led to premature fruit ripening and leaf senescence, likely due to disrupted reactive oxygen species homeostasis resulting from SlLCD1 mislocalization in the slimpa3 mutant.

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