Transcriptional repressor RST1 controls salt tolerance and grain yield in rice by regulating gene expression of asparagine synthetase

文献类型： 外文期刊

第一作者： Deng, Ping

作者： Deng, Ping;Jing, Wen;Cao, Chengjuan;Shi, Xingyu;Wu, Qi;Guo, Chunxia;Tian, Quanxiang;Shen, Like;Yuan, Jingya;Zhang, Qun;Zhang, Wenhua;Sun, Mingfa;Zhao, Shaolu;Dai, Jinying;Chi, Wenchao;Yu, Jun;Jiang, Ling;Wang, Chunming;Wu, Qi;Zhang, Baolong;Jin, Zhuo;Chin, Joong Hyoun

作者机构：

关键词： auxin response factor; Salt tolerance; grain yield; asparagine synthetase; rice

期刊名称：PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA （ 影响因子：11.1； 五年影响因子：12.0 ）

ISSN： 0027-8424

年卷期： 2022 年 119 卷 50 期

页码：

收录情况： SCI

摘要： Salt stress impairs nutrient metabolism in plant cells, leading to growth and yield penalties. However, the mechanism by which plants alter their nutrient metabolism processes in response to salt stress remains elusive. In this study, we identified and characterized the rice (Oryza sativa) rice salt tolerant 1 (rst1) mutant, which displayed improved salt tolerance and grain yield. Map-based cloning revealed that the gene RST1 encoded an auxin response factor (OsARF18). Molecular analyses showed that RST1 directly repressed the expression of the gene encoding asparagine synthetase 1 (OsAS1). Loss of RST1 function increased the expression of OsAS1 and improved nitrogen (N) utilization by promoting asparagine production and avoiding excess ammonium (NH4+) accumulation. RST1 was undergoing directional selection during domestication. The superior haplotype RST1(Hap III) decreased its transcriptional repression activity and contributed to salt tolerance and grain weight. Together, our findings unravel a synergistic regulator of growth and salt tolerance associated with N metabolism and provide a new strategy for the development of tolerant cultivars.

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