Characterization of fluoride uptake by roots of tea plants (Camellia sinensis (L.) O. Kuntze)

文献类型： 外文期刊

第一作者： Zhang, Lei

作者： Zhang, Lei;Li, Qiong;Ma, Lifeng;Ruan, Jianyun;Zhang, Lei;Li, Qiong;Ma, Lifeng;Ruan, Jianyun

作者机构：

关键词： Camellia sinensis;Tea;Fluoride;Active uptake;Passive uptake;Kinetics;Root;Anion channel;Metabolism inhibitor;Fluoride accumulating plants

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

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收录情况： SCI

摘要： Tea plants (Camellia sinensis (L.) O. Kuntze) accumulate high fluoride in the leaves whereas the mechanism on its uptake is poorly understood. The measured F- uptake was compared to calculated uptake from transpiration rates assumuing no discrimination between F- and water to characterize the property of F- absorption by tea plant roots. The F- uptake was examined by depletion method under variable external F- concentrations, pH, temperature, relative air humidity, anion channel blockers and metabolism inhibitors in solution experiments. Measured F- uptake rates were significantly larger than those calculated from transpiration rates regardless of external F- concentrations, uptake durations, relative humidity, and solution pH. The measured and net F- uptake (subtracting that calculated from transpiration rate from the measured uptake) were reduced by low temperature and inhibited by anion channel and metabolism inhibitors anthracene-9-carboxylic acid (A-9-C), niflumic acid (NFA), and carbonylcyanide m-chlorophenylhydrazone (CCCP) but not by dihydro-4, 4' diisothiocyanostilbene-2, 2'-disulphonic acid (DIDS). The F- uptake showed biphasic response patterns, following saturable Michaelis-Menten kinetics in the range of low external F- (below 100 mu mol L-1) while increased linearly with external supply in the range of high concentrations. The uptake of F- by roots of accumulator tea plants was likely an active process and energy-dependent. This helps to explain why tea plants are able to accumulate considerably high F-.

分类号： S15

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