Journal
PLANT CELL
Volume 31, Issue 9, Pages 2107-2130Publisher
OXFORD UNIV PRESS INC
DOI: 10.1105/tpc.18.00662
Keywords
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Funding
- National Key Research and Development Program of China [2016YFD0101902]
- National Transgenic Project of China [2018ZX08009-14B, 2016ZX08010002002]
- Major Program of Shandong Province Natural Science Foundation [ZR2018ZC0334]
- National Natural Science Foundation of China [31770317, 31471515, 31201269, 30970243]
- National Special Science Research Program of China [2013CB967300]
- National High Technology Research and Development Program 863 [2013AA102602-4]
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Abscisic acid (ABA) and reactive oxygen species (ROS) act as key signaling molecules in the plant response to salt stress; however, how these signals are transduced and amplified remains unclear. Here, a soybean (Glycine max) salinity-induced NAM/ATAF1/2/CUC2 (NAC) transcription factor encoded by SALT INDUCED NAC1 (GmSIN1) was shown to be a key component of this process. Overexpression of GmSIN1 in soybean promoted root growth and salt tolerance and increased yield under salt stress; RNA interference-mediated knockdown of GmSIN1 had the opposite effect. The rapid induction of GmSIN1 in response to salinity required ABA and ROS, and the effect of GmSIN1 on root elongation and salt tolerance was achieved by boosting cellular ABA and ROS contents. GmSIN1 upregulated 9-cis-epoxycarotenoid dioxygenase coding genes in soybean (GmNCED3s, associated with ABA synthesis) and Respiratory burst oxidase homolog B genes in soybean (GmRbohBs, associated with ROS generation) by binding to their promoters at a site that has not been described to date. Together, GmSIN1, GmNCED3s, and GmRbohBs constitute a positive feed-forward system that enables the rapid accumulation of ABA and ROS, effectively amplifying the initial salt stress signal. These findings suggest that the combined modulation of ABA and ROS contents enhances soybean salt tolerance.
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