Glutathione homeostasis and Cd tolerance in the Arabidopsis sultr1;1-sultr1;2 double mutant with limiting sulfate supply

文献类型： 外文期刊

第一作者： Liu, Xiang

作者： Liu, Xiang;Wu, Fei-Hua;Chen, Juan;Wang, Guang-Hui;Hu, Wen-Jun;Simon, Martin;Zheng, Hai-Lei;Wu, Fei-Hua;Li, Jing-Xi;Gao, Li-Jie;Wang, Zong-Ling;Chen, Jun-Hui;Hu, Wen-Jun;Wang, Wen-Hua

作者机构：

关键词： Antioxidative defense;Arabidopsis;Cadmium toxicity;Glutathione homeostasis;Sulfate transporter;Sulfur assimilation-related genes

期刊名称：PLANT CELL REPORTS （ 影响因子：4.57； 五年影响因子：4.463 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： In plants, glutathione (GSH) homeostasis plays pivotal role in cadmium (Cd) detoxification. GSH is synthesized by sulfur (S) assimilation pathway. Many studies have tried to investigate the role of GSH homeostasis on Cd tolerance using mutants; however, most of them have focused on the last few steps of S assimilation. Until now, mutant evidence that explored the relationship between GSH homeostasis on Cd tolerance and S absorption is rare. To further reveal the role of GSH homeostasis on Cd stress, the wild-type and a sultr1;1-sultr1;2 double mutant which had a defect in two distinct high-affinity sulfate transporters were used in this study. Growth parameters, biochemical or zymological indexes and S assimilation-related genes' expression were compared between the mutant and wild-type Arabidopsis plants. It was found that the mutations of SULTR1;1 and SULTR1;2 did not affect Cd accumulation. Compared to the wild-type, the double mutant was more sensitive to Cd under limited sulfate supply and suffered from stronger oxidative damage. More importantly, under the same condition, lower capacity of S assimilation resulted in decreased GSH content in mutant. Faced to the limited GSH accumulation, mutant seedlings consumed a large majority of GSH in pool for the synthesis of phytochelatins rather than participating in the antioxidative defense. Therefore, homeostasis of GSH, imbalance between antioxidative defense and severe oxidative damage led to hypersensitivity of double mutant to Cd under limited sulfate supply.

分类号： Q942

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