Organic acids enhance the uptake of lead by wheat roots

	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
刊名	PLANTA
	2007
卷号	225 期号:6 页码:1483-1494
关键词	Ca2+ and K+ channels organic acids P-type ATPase uptake of lead (Pb) wheat (Triticum aestivum L.) X-ray absorption spectroscopy
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
英文摘要	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.
学科主题	Plant Sciences
类目[WOS]	Plant Sciences
研究领域[WOS]	Plant Sciences
原文出处	SCI
语种	英语
WOS记录号	WOS:000245852700013
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/239373]
专题	高能物理研究所_多学科研究中心
作者单位	中国科学院高能物理研究所
推荐引用方式 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.