Over-expression of spermidine synthase 2 (SlSPDS2) in tomato plants improves saline-alkali stress tolerance by increasing endogenous polyamines content to regulate antioxidant enzyme system and ionic homeostasis

被引：23

作者：

Wang, Pengju ^{[1
,2
,3
]}

Abc, Zijian Xu ^{[1
,2
,3
]}

Zhang, Yong ^{[1
,2
,3
]}

Ma, Yongbo ^{[1
,2
,3
]}

Yang, Jianyu ^{[1
,2
,3
]}

Zhou, Fan ^{[1
]}

Gao, Yi

Li, Guobin ^{[1
]}

Hu, Xiaohui ^{[1
]}

机构：

[1] Northwest A&F Univ, Coll Hort, Yangling 712100, Shaanxi, Peoples R China

[2] Minist Agr, Key Lab Protected Hort Engn Northwest, Yangling 712100, Shaanxi, Peoples R China

[3] Shaanxi Protected Agr Res Ctr, Yangling 712100, Shaanxi, Peoples R China

来源：

PLANT PHYSIOLOGY AND BIOCHEMISTRY | 2022年 / 192卷

关键词：

Solanum lycopersicum; Saline-alkali stress; SlSPDS2; Polyamines; Antioxidant enzymes; Ion homeostasis; NA+/H+ ANTIPORTER GENE; SALT TOLERANCE; LIPID-PEROXIDATION; ABIOTIC STRESS; EXOGENOUS SPERMIDINE; OXIDATIVE STRESS; SOLUBLE SUGARS; METABOLISM; SODIUM; PUTRESCINE;

D O I：

10.1016/j.plaphy.2022.09.025

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Endogenous spermidine can improve the resistance of plants to saline-alkali stress. SlSPDSI and SlSPDS2 are the main spermidine synthase (SPDS) genes in tomatoes. In comparison with SlSPDSE SlSPDS2 plays an important role in wild-type tomato seedling under saline-alkali stress. However, limited research has focused on the role of S1SPDS2 in saline-alkali stress. Wild-type (WT) and SPDS gene (SlSPDS2) transgenic over-expression tomato seedlings were used to explore the function of endogenous spermidine on the saline-alkali resistance of tomato seedlings. The results show that SlSPDS2 overexpression under normal conditions and saline-alkali stress increased the content of endogenous free polyamines and the expression levels of polyamine synthesis-related genes in tomato seedlings. Under saline-alkali stress, SlSPDS2 overexpression significantly reduced Na+/K+ ratio, relative electrical conductivity, O-2(center dot-), H2O2, and malondialdehyde content, increased Seedling index, relative water content, antioxidant enzyme activities (peroxidase, superoxide dismutase, and catalase), and the contents of proline and soluble sugar in tomato leaf, and mitigated the adverse effect of saline-alkali stress on tomato seedlings. In summary, the overexpression of SlSPDS2 tomato seedlings regulated the ionic homeostasis, antioxidant enzyme system, and osmotic regulatory substances of tomato seedlings living in saline-alkali environment by increasing endogenous free polyamine content, thereby improving the resistance of tomato seedlings against saline-alkali stress.

引用

页码：172 / 185

页数：14