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Organic acids enhance the uptake of lead by wheat roots
Wang, HH; Shan, XQ; Liu T(刘涛); Xie YN(谢亚宁); Liu, T; Xie, YN; Wen, B; Zhang, SZ; Han, F; van Genuchten, MT
2007
发表期刊PLANTA
卷号225期号:6页码:1483-1494
通讯作者Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China ; Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Lab, Beijing 100049, Peoples R China ; USDA ARS, US Salin Lab, Riverside, CA 92501 USA
摘要The uptake and bioavailability of lead (Pb) in soil-plant systems remain poorly understood. This study indicates that acetic and malic acids enhance the uptake of Pb by wheat (Triticum aestivum L.) roots under hydroponic conditions. The net concentration-dependent uptake influx of Pb in the presence and absence of organic acids was characterized by Michaelis-Menten type nonsaturating kinetic curves that could be resolved into linear and saturable components. Fitted maximum uptake rates (V-max) of the Michaelis-Menton saturable component in the presence of acetic and malic acids were, respectively, 2.45 and 1.63 times those of the control, while the Michaelis-Menten K-m values of 5.5, 3.7 and 2.2 mu M, respectively, remained unchanged. Enhanced Pb uptake by organic acids was partially mediated by Ca2+ stop and K+ stop channels, and also depended upon the physiological function of the plasma membrane P-type ATPase. Uptake may have been further enhanced by an effectively thinner unstirred layer of Pb adjacent to the roots, leading to more rapid diffusion towards roots. X-ray absorption spectroscopic studies provided evidence that the coordination environment of Pb in wheat roots was similar to that of Pb(CH3COO)(2)center dot 3H(2)O in that one Pb atom was coordinated to four oxygen atoms via the carboxylate group.
文章类型Article
关键词Ca2+ and K+ channels organic acids P-type ATPase uptake of lead (Pb) wheat (Triticum aestivum L.) X-ray absorption spectroscopy
学科领域Plant Sciences
DOI10.1007/s00425-006-0433-7
研究领域[WOS]Plant Sciences
URL查看原文
语种英语
WOS类目Plant Sciences
WOS记录号WOS:000245852700013
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被引频次:19[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/239373
专题多学科研究中心
作者单位中国科学院高能物理研究所
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GB/T 7714
Wang, HH,Shan, XQ,Liu T,et al. Organic acids enhance the uptake of lead by wheat roots[J]. PLANTA,2007,225(6):1483-1494.
APA Wang, HH.,Shan, XQ.,刘涛.,谢亚宁.,Liu, T.,...&van Genuchten, MT.(2007).Organic acids enhance the uptake of lead by wheat roots.PLANTA,225(6),1483-1494.
MLA Wang, HH,et al."Organic acids enhance the uptake of lead by wheat roots".PLANTA 225.6(2007):1483-1494.
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