Endoplasmic reticulum stress response modulator OsbZIP39 regulates cadmium accumulation via activating the expression of defensin-like gene OsCAL2 in rice

文献类型： 外文期刊

第一作者： Li, Jian

作者： Li, Jian;Dai, Guang-Yi;Fang, Zhi-Qiang;Xia, Kuai-Fei;Zeng, Xuan;Zhang, Ming-Yong;Li, Jian;Dai, Guang-Yi;Fang, Zhi-Qiang;Xia, Kuai-Fei;Zeng, Xuan;Zhang, Ming-Yong;Wang, Ling-Yan;He, Meng-Ling;Yao, Nan;Huang, Huan-Chao;Zhao, Jun-Liang

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关键词： OsbZIP39; Sphingolipids; Cadmium; Rice

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：12.2； 五年影响因子：11.9 ）

ISSN： 0304-3894

年卷期： 2024 年 476 卷

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收录情况： SCI

摘要： Accumulation of cadmium (Cd) in rice is not only harmful to the growth of plants but also poses a threat to human health. Exposure to Cd triggers unfolded protein response (UPR) within cells, a process that is still not completely understood. The study demonstrated that the lack of OsbZIP39, an essential endoplasmic reticulum (ER)-resident regulator of the UPR, resulted in decreased Cd intake and reduced Cd levels in the roots, stems, and grains of rice. Upon exposure to Cd stress, GFP-OsbZIP39 translocated from ER to nucleus, initiating UPR. Further investigation revealed that Cd treatment caused changes in sphingolipid levels in the membrane, influencing the localization and activation of OsbZIP39. Yeast one-hybrid and dual-LUC assays were conducted to validate the interaction between activated OsbZIP39 and the promoter of the defensin-like gene OsCAL2, , resulting in an increase in its expression. Different variations were identified in the coding region of OsbZIP39, , which may explain the varying levels of Cd accumulation observed in the indica and japonica subspecies. Under Cd treatment, OsbZIP39ind ind exhibited a more significant enhancement in the transcription of OsCAL2 compared to OsbZIP39jap. jap . Our data suggest that OsbZIP39 positively regulates Cd uptake in rice, offering an encouraging objective for the cultivation of low-Cd rice.

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