Methyltransferase TaSAMT1 mediates wheat freezing tolerance by integrating brassinosteroid and salicylic acid signaling

• DOI: 10.1093/plcell/koae100
• Publication Date: 2024-03-28T00:25:02Z
• Authors: Wei Chu; Shumin Chang; Jingchen Lin; Chenji Zhang; Jinpeng Li; Xingbei Liu; Zehui Liu; Debiao Liu; Qun Yang; Danyang Zhao; Xiaoyu Liu; Weilong Guo; Mingming Xin; Yingyin Yao; Huiru Peng; Chaojie Xie; Zhongfu Ni; Qixin Sun; Zhaorong Hu
• Keywords: Freezing tolerance; Histone acetyltransferase; Photomorphogenesis; Brassinosteroid

Abstract Cold injury is a major environmental stress affecting the growth and yield of crops. Brassinosteroids (BRs) salicylic acid (SA) play important roles in plant cold tolerance. However, whether or how BR signaling interacts with SA pathway response to still unknown. Here, we identified an methyltransferase, TaSAMT1 that converts methyl (MeSA) confers freezing tolerance wheat (Triticum aestivum). overexpression greatly enhanced tolerance, plants accumulating more MeSA less SA, whereas Tasamt1 knockout lines were sensitive accumulated SA. Spraying conferred mutants, but did not. We revealed BRASSINAZOLE-RESISTANT 1 (TaBZR1) directly binds promoter induces its transcription. Moreover, TaBZR1 histone acetyltransferase TaHAG1, which potentiates expression via increased acetylation modulates during stress. Additionally, TaHAG1 altered improved Our results demonstrate key regulatory node connects pathways response. The factors genes could be effective targets for genetic improvement