TaGPAT6 enhances salt tolerance in wheat by synthesizing cutin and suberin monomers to form a diffusion barrier  

作　　者：Wenlong Wang Menghan Chi Shupeng Liu Ying Zhang Jiawang Song Guangmin Xia Shuwei Liu 

机构地区：[1]Key Laboratory of Plant Development and Environmental Adaptation Biology,Ministry of Education,Shandong Key Laboratory of Precision Molecular Crop Design and Breeding,School of Life Science,Shandong University,Qingdao 266237,China [2]National Center of Technology Innovation for Comprehensive Utilization of Saline-Alkali Land,Dongying 257345,China [3]State Key Laboratory of Microbial Technology,Shandong University,Qingdao 266237,China

出　　处：《Journal of Integrative Plant Biology》2025年第2期208-225,共18页植物学报(英文版)

基　　金：supported by grants from the National Key Research and Development Program of China(2022 YFD1201700);the National Natural Science Foundation of China(32171935 and 32372039);the Agricultural Variety Improvement Project of Shandong Province(2022LZGC002);the Natural Science Foundation of Shandong Province(ZR2019ZD16);the Intramural Joint Program Fund of State Key Laboratory of Microbial Technology(SKLMTIJP-2024-06)。

摘　　要：One mechanism plants use to tolerate high salinity is the deposition of cutin and suberin to form apoplastic barriers that limit the influx of ions.However,the mechanism underlying barrier formation under salt stress is unclear.Here,we characterized the glycerol-3-phosphate acyltransferase(GPAT)family gene TaGPAT6,encoding a protein involved in cutin and suberin biosynthesis for apoplastic barrier formation in wheat(Triticum aestivum).TaGPAT6 has both acyltransferase and phosphatase activities,which are responsible for the synthesis of sn-2-monoacylglycerol(sn-2 MAG),the precursor of cutin and suberin.Overexpressing TaGPAT6 promoted the deposition of cutin and suberin in the seed coat and the outside layers of root tip cells and enhanced salt tolerance by reducing sodium ion accumulation within cells.By contrast,TaGPAT6 knockout mutants showed increased sensitivity to salt stress due to reduced cutin and suberin deposition and enhanced sodium ion accumulation.Yeast-one-hybrid and electrophoretic mobility shift assays identified TaABI5 as the upstream regulator of TaGPAT6.TaABI5 knockout mutants showed suppressed expression of TaGPAT6 and decreased barrier formation in the seed coat.These results indicate that TaGPAT6 is involved in cutin and suberin biosynthesis and the resulting formation of an apoplastic barrier that enhances salt tolerance in wheat.

关 键 词：cutin and suberin glycerol-3-phosphate acyltransferase(GPAT) salt tolerance WHEAT 

分 类 号：O62[理学—有机化学]