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Journal of Integrative Agriculture  2023, Vol. 22 Issue (8): 2384-2396    DOI: 10.1016/j.jia.2023.07.015
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SlTPP4 participates in ABA-mediated salt tolerance by enhancing root architecture in tomato

DU Dan1*, HU Xin1*, SONG Xiao-mei1, XIA Xiao-jiao1, SUN Zhen-yu1, LANG Min1, PAN Yang-lu1, ZHENG Yu1, 2#, PAN Yu1#

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

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摘要  

提高作物的耐盐性已当前作物育种研究主要方向之一,而植物根系在抵御高盐胁迫中起着重要作用。在本研究中,我发现番茄海藻糖-6-磷酸磷酸酶基因(SlTPP4)主要在根系中表达,且其表达受脱落酸(ABA)和盐胁迫的诱导。进一步功能研究发现在番茄中超表达SlTPP4可以增强植株对盐胁迫的耐受性表现出更好的生长态势。对其耐盐机制研究表明SlTPP4超表达株系中糖代谢途径以及盐胁迫相关基因的表达增强,此外,ABA合成途径相关基因的表达升高,同时ABA信号转导途径相关基因的表达也发生了显著变化。进一步的深入解析发现SlTPP4能调控盐胁迫下根内皮层凯氏带的发育,减少有害离子非质外体途径的摄入进而提高植物对盐胁迫的耐受性综上,本研究初步探明了SlTPP4介导耐盐性的生物学功能及机制,为耐盐番茄的育种提供理论支撑。



Abstract  

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.

Keywords:  trehalose-6-phosphate phosphatase (TPP)        salt tolerance        root        ABA        tomato (Solanum lycopersicum)  
Received: 21 December 2022   Accepted: 26 June 2023
Fund: 

This work was 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) and the Chongqing Natural Science Foundation, China (cstc2018jcyjAX0730).

About author:  #Correspondence ZHENG Yu, Tel: +86-23-61065440, E-mail: Zhengyu622@cqvie.edu.cn; PAN Yu, Tel: +86-23-68250227, E-mail: panyu1020@swu.edu.cn * These authors contributed equally to this study.

Cite this article: 

DU Dan, HU Xin, SONG Xiao-mei, XIA Xiao-jiao, SUN Zhen-yu, LANG Min, PAN Yang-lu, ZHENG Yu, PAN Yu. 2023. SlTPP4 participates in ABA-mediated salt tolerance by enhancing root architecture in tomato. Journal of Integrative Agriculture, 22(8): 2384-2396.

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