Organic acids enhance the uptake of lead by wheat roots
文献类型：期刊论文
| 作者 | Wang, Huanhua ; Shan, Xiaoquan ; Liu, Tao ; Xie, Yaning ; Wen, Bei ; Zhang, Shuzhen ; Han, Fang ; van Genuchten, Martinus Th. |
| 刊名 | PLANTA
 |
| 出版日期 | 2007-05 |
| 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 |
| 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. |
| WOS记录号 | WOS:000245852700013 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/22485]  |
| 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 | Wang, Huanhua,Shan, Xiaoquan,Liu, Tao,et al. Organic acids enhance the uptake of lead by wheat roots[J]. PLANTA,2007,225(6):1483-1494. |
| APA | Wang, Huanhua.,Shan, Xiaoquan.,Liu, Tao.,Xie, Yaning.,Wen, Bei.,...&van Genuchten, Martinus Th..(2007).Organic acids enhance the uptake of lead by wheat roots.PLANTA,225(6),1483-1494. |
| MLA | Wang, Huanhua,et al."Organic acids enhance the uptake of lead by wheat roots".PLANTA 225.6(2007):1483-1494. |
入库方式： OAI收割
来源：生态环境研究中心
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