Sorghum roots are inefficient in uptake of EDTA-chelated lead
文献类型：期刊论文
| 作者 | Xu, Yong; Yamaji, Naoki; Shen, Renfang; Ma, Jian Feng |
| 刊名 | ANNALS OF BOTANY
 |
| 出版日期 | 2007-05-01 |
| 卷号 | 99期号:5页码:869-875 |
| 关键词 | complex EDTA form Pb phytoremediation uptake system sorghum (Sorghum bicolor) |
| ISSN号 | 0305-7364 |
| DOI | 10.1093/aob/mcm038 |
| 通讯作者 | Ma, Jian Feng(maj@rib.okayama-u.ac.jp) |
| 英文摘要 | Background and Aims Ethylene diamine tetraacetic acid (EDTA)-assisted phytoremediation has been developed to clean up lead (Pb)-contaminated soil; however, the mechanism responsible for the uptake of EDTA-Pb complex is not well understood. In this study, the accumulation process of Pb from EDTA-Pb is characterized in comparison to ionic Pb [Pb(NO3)(2)] in sorghum (Sorghum bicolor). Methods Sorghum seedlings were exposed to a 0.5 mm CaCl2 (pH 5.0) solution containing 0, 1 mm Pb(NO3)(2) or EDTA-Pb complexes at a molar ratio of 1:0.5, 1:1, 1:2 and 1:4 (Pb:EDTA). The root elongation of sorghum at different ratios of Pb:EDTA was measured. Xylem sap was collected after the stem was severed at different times. The concentration of Pb in the shoots and roots were determined by an atomic absorption spectrometer. In addition, the roots were stained with Fluostain I for observation of the root structure. Key Results Lead accumulation in the shoots of the plants exposed to EDTA-Pb at 1:1 ratio was only one-fifth of that exposed to ionic Pb at the same concentration. Lead accumulation decreased when transpiration was suppressed. The concentration of Pb in the xylem sap from the EDTA-Pb-treated plants was about 1/25 000 of that in the external solution. Root elongation was severely inhibited by ionic Pb, but not by EDTA-Pb at a 1:1 ratio. Root staining showed that a physiological barrier was damaged in the roots exposed to ionic Pb, but not in the roots exposed to EDTA-Pb. Conclusions All these results suggest that sorghum roots are inefficient in uptake of EDTA-chelated Pb and that enhanced Pb accumulation from ionic Pb was attributed to the damaged structure of the roots. |
| 收录类别 | SCI |
| WOS关键词 | INDIAN MUSTARD ; PB ; PHYTOREMEDIATION ; PHYTOEXTRACTION ; ACCUMULATION ; TRANSPORT ; TRANSLOCATION ; CADMIUM ; STRESS ; AGENTS |
| WOS研究方向 | Plant Sciences |
| WOS类目 | Plant Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000246120200007 |
| 出版者 | OXFORD UNIV PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2558691 |
| 专题 | 南京土壤研究所 |
| 通讯作者 | Ma, Jian Feng |
| 作者单位 | 1.Okayama Univ, Res Inst Bioresources, Kurashiki, Okayama 7100046, Japan 2.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, Yong,Yamaji, Naoki,Shen, Renfang,et al. Sorghum roots are inefficient in uptake of EDTA-chelated lead[J]. ANNALS OF BOTANY,2007,99(5):869-875. |
| APA | Xu, Yong,Yamaji, Naoki,Shen, Renfang,&Ma, Jian Feng.(2007).Sorghum roots are inefficient in uptake of EDTA-chelated lead.ANNALS OF BOTANY,99(5),869-875. |
| MLA | Xu, Yong,et al."Sorghum roots are inefficient in uptake of EDTA-chelated lead".ANNALS OF BOTANY 99.5(2007):869-875. |
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来源：南京土壤研究所
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