Abstract：
: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 CdCl(2), 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 Cd(2+) into less toxic and more easily transportable forms in plant cells.
journal_name
Biol Trace Elem Resjournal_title
Biological trace element researchauthors
Hou L,Shi W,Wei W,Shen Hdoi
10.1007/s12011-010-8657-6subject
Has Abstractpub_date
2011-02-01 00:00:00pages
228-40issue
2eissn
0163-4984issn
1559-0720journal_volume
139pub_type
杂志文章abstract：:Interactions of clinical laboratory parameters with trace elements in knee-joint effusions might turn out to be potential diagnostic tool, increasing our pathophysiological understanding and knowledge on knee-joint effusions. Thus, the 11 clinical laboratory parameters, total protein, albumin, glucose, lactate dehydro...
journal_title：Biological trace element research
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