Cadmium Uptake, Translocation, and Tolerance in AHA1OX Arabidopsis thaliana
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- 作者：Lingyan Hou (1) (2)
Weiming Shi (1)
Wenhui Wei (3)
Hong Shen (2) - 关键词：Arabidopsis ; Cadmium treatment ; Citrate secretion ; Plasma membrane H+ ; ATPase ; Root ; to ; shoot Cd translocation
- 刊名：Biological Trace Element Research
- 出版年：2011
- 出版时间：February 2011
- 年：2011
- 卷：139
- 期：2
- 页码：228-240
- 全文大小：305KB
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Weiming Shi (1)
Wenhui Wei (3)
Hong Shen (2)
1. Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
2. College of Resources and Environment, South China Agricultural University, Guangzhou, 510642, China
3. Key Laboratory of Oil Crop Biology of the Ministry of Agriculture, Wuhan, 430062, China
文摘
Information on cadmium (Cd) uptake and transport is essential to understand better the physiology of Cd tolerance in plants. In this study, Cd uptake, translocation, and tolerance were investigated in AHA1 (Arabidopsis plasma membrane H+-ATPase gene) overexpressed plants. Exposed to 10?μM CdCl2, AHA1OX showed a higher root elongation, accumulated more Cd, and maintained better integrity of nucleus membrane of root tips in comparison to the control plant (WT), suggesting that AHA1OX was more Cd tolerant than WT. To investigate Cd tolerance mechanism of AHA1OX plants, we measured the activity of plasma membrane H+-ATPase and the secretion of citrate. Results indicated that treatment with 10?μM of Cd stimulated the activity of plasma membrane H+-ATPase and the secretion of citrate, while 30?μM of Cd inhibited them. AHA1OX had higher activity of H+-ATPase and secretion of citrate than WT. Addition of citrate enhanced root-to-shoot translocation of Cd significantly. A higher root-to-shoot Cd translocation was observed in AHA1OX than in WT plants. Treatment with low temperature or metabolic inhibitor (carbonyl cyanide m-chlorophenylhydrazone) inhibited Cd uptake and translocation. The study of Cd forms using sequential extraction indicated that Cd was mainly present as a protein-bound form, and AHA1OX had more water-soluble Cd than WT. Taken together, our results suggested that the Cd tolerance of AHA1OX was associated with its root-to-shoot Cd translocation and secretion of citrate, which converts Cd2+ into less toxic and more easily transportable forms in plant cells.