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Organic acids promote the uptake of lanthanum by barley roots

文献类型：期刊论文

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作者Han, F; Shan, XQ; Zhang J(张静); Xie YN(谢亚宁); Zhang, J; Xie, YN; Pei, ZG; Zhang, SZ; Zhu, YG; Wen, B
刊名NEW PHYTOLOGIST ; NEW PHYTOLOGIST
出版日期2005 ; 2005
卷号165期号:2页码:481-492
关键词barley (Hordeum vulgare) cation channel organic acids uptake of lanthanum (La) X-ray absorption spectroscopy barley (Hordeum vulgare) cation channel organic acids uptake of lanthanum (La) X-ray absorption spectroscopy
DOI10.1111/j.1469-8137.2004.01256.x
通讯作者Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China ; Chinese Acad Sci, Inst High Energy Phys, State Key Lab Synchrotron Radiat, Beijing 100039, Peoples R China ; Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China ; Chinese Acad Sci, Inst High Energy Phys, State Key Lab Synchrotron Radiat, Beijing 100039, Peoples R China
文献子类Article
英文摘要Organic acids play an important role in metal uptake by, and accumulation in, plants. However, the relevant mechanisms remain obscure. Acetic, malic and citric acids increased the uptake of lanthanum (La) by barley (Hordeum vulgare) roots and enhanced La content in shoots under hydroponic conditions. Concentration-dependent net La influx in the absence and presence of organic acids yielded nonsaturating kinetic curves that could be resolved into linear and saturable components. The saturable component followed Michaelis-Menten kinetics. The K-m values were similar; however, the V-max values in the presence of acetic, malic and citric acids were 4.3, 2.8, 1.5-times that of the control, respectively. Enhanced uptake of La by organic acids was mediated mainly, but not solely, by Ca2+ channels. X-ray absorption spectroscopic techniques provided evidence of La-oxygen environment and established that La(III) was coordinated to 11 oxygen atoms that are likely to be involved in the binding of La(III) to barley roots via carboxylate groups and hydration of La(III).; Organic acids play an important role in metal uptake by, and accumulation in, plants. However, the relevant mechanisms remain obscure. Acetic, malic and citric acids increased the uptake of lanthanum (La) by barley (Hordeum vulgare) roots and enhanced La content in shoots under hydroponic conditions. Concentration-dependent net La influx in the absence and presence of organic acids yielded nonsaturating kinetic curves that could be resolved into linear and saturable components. The saturable component followed Michaelis-Menten kinetics. The K-m values were similar; however, the V-max values in the presence of acetic, malic and citric acids were 4.3, 2.8, 1.5-times that of the control, respectively. Enhanced uptake of La by organic acids was mediated mainly, but not solely, by Ca2+ channels. X-ray absorption spectroscopic techniques provided evidence of La-oxygen environment and established that La(III) was coordinated to 11 oxygen atoms that are likely to be involved in the binding of La(III) to barley roots via carboxylate groups and hydration of La(III).
学科主题Plant Sciences ; Plant Sciences
类目[WOS]Plant Sciences
研究领域[WOS]Plant Sciences
URL标识查看原文
WOS研究方向Plant Sciences
原文出处SCI
语种英语 ; 英语
WOS记录号WOS:000226423700015 ; WOS:000226423700015
源URL[http://ir.ihep.ac.cn/handle/311005/237662]  
专题高能物理研究所_多学科研究中心
高能物理研究所_实验物理中心
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		 Han, F,Shan, XQ,Zhang J,et al. Organic acids promote the uptake of lanthanum by barley roots, Organic acids promote the uptake of lanthanum by barley roots[J]. NEW PHYTOLOGIST, NEW PHYTOLOGIST,2005, 2005,165, 165(2):481-492, 481-492.
APA Han, F.,Shan, XQ.,张静.,谢亚宁.,Zhang, J.,...&Wen, B.(2005).Organic acids promote the uptake of lanthanum by barley roots.NEW PHYTOLOGIST,165(2),481-492.
MLA Han, F,et al."Organic acids promote the uptake of lanthanum by barley roots".NEW PHYTOLOGIST 165.2(2005):481-492.

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来源：高能物理研究所

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