SlTPP4 participates in ABA-mediated salt tolerance by enhancing root architecture in tomato  

作　　者：DU Dan HU Xin SONG Xiao-mei XIA Xiao-jiao SUN Zhen-yu LANG Min PAN Yang-lu ZHENG Yu PAN Yu 

机构地区：[1]Key Laboratory of Horticulture Science for Southern Mountainous Regions,Ministry of Education/College of Horticulture and Landscape Architecture/Academy of Agricultural Sciences,Southwest University,Chongqing 400715,P.R.China [2]Chongqing Vocational Institute of Engineering,Chongqing 402260,P.R.China

出　　处：《Journal of Integrative Agriculture》2023年第8期2384-2396,共13页农业科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(32172597);the Chongqing Post Doctoral Special Support Project,China(2112012724652268);the Chongqing Exceptional Young Talents Project,China(CQYC202005097);the Chongqing Natural Science Foundation,China(cstc2018jcyjAX0730)。

摘　　要：Salinity tolerance is an important physiological index for crop breeding.Roots are typically the first plant tissue to withstand salt stress.In this study,we found that the tomato(Solanum lycopersicum)trehalose-6-phosphate phosphatase(SlTPP4)gene is induced by abscisic acid(ABA)and salt,and is mainly expressed in roots.Overexpression of SlTPP4 in tomato enhanced tolerance to salt stress,resulting in better growth performance.Under saline conditions,SlTPP4 overexpression plants demonstrated enhanced sucrose metabolism,as well as increased expression of genes related to salt tolerance.At the same time,expression of genes related to ABA biosynthesis and signal transduction was enhanced or altered,respectively.In-depth exploration demonstrated that SlTPP4 enhances Casparian band development in roots to restrict the intake of Na^(+).Our study thus clarifies the mechanism of SlTPP4-mediated salt tolerance,which will be of great importance for the breeding of salt-tolerant tomato crops.

关 键 词：trehalose-6-phosphate phosphatase(TPP) salt tolerance root ABA tomato(Solanum lycopersicum) 

分 类 号：S641.2[农业科学—蔬菜学]