Organic acids promote the uptake of lanthanum by barley roots

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境化学与生态毒理学国家重点实验室

	Organic acids promote the uptake of lanthanum by barley roots
	Han, F; Shan, XQ; Zhang, J; Xie, YN; Pei, ZG; Zhang, SZ; Zhu, YG; Wen, B
刊名	NEW PHYTOLOGIST
	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
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).
学科主题	Plant Sciences
研究领域[WOS]	Plant Sciences
WOS记录号	WOS:000226423700015
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/23198]
专题	生态环境研究中心_环境化学与生态毒理学国家重点实验室
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[J]. NEW PHYTOLOGIST,2005,165(2):481-492.
APA	Han, F.,Shan, XQ.,Zhang, J.,Xie, YN.,Pei, ZG.,...&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.