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Silicon mediated the detoxification of Cr on pakchoi (Brassica Chinensis L.) in cr-contaminated soil

文献类型： 外文期刊

作者： Ding, Xiaodong 1 ; Zhang, Shirong 1 ; Li, Shuyi 1 ; Liao, Xinrong 1 ; Wang, Rongping 1 ;

作者机构： 1.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China

关键词： Pakchoi (Brassica Chinensis L.);Si;Cr;Uptake;Amendment;Cr fractionation

期刊名称：2013 INTERNATIONAL SYMPOSIUM ON ENVIRONMENTAL SCIENCE AND TECHNOLOGY (2013 ISEST)

ISSN： 1878-0296

年卷期： 2013 年 18 卷

页码：

收录情况： SCI

摘要： To test the hypothesis that exogenous silicon (Si) would mediate the detoxification of Chromium (Cr) on pakchoi (Brassica Chniensis L.) growing in Cr-contaminated soil, a pot experiment that 0, 50, 100 and 200 mg.kg(-1) Cr (Na2Cr2O7 center dot 2H(2)O) were supplied to soil together with 0, 0.5, 1.0 and 1.5 g.kg(-1) Si (Na25iO3) for 48 days, was studied. Results showed that supplying Si improved the growth of pakchoi in low Cr level. However, the shoot dry weight decreased with the increasing Si supplied in high Cr level. Compared with under non-Cr stress, the application of Si significantly increased the activities of POD, SOD and CAT of pakchoi under excess Cr. However, antioxidant enzymes activities displayed no difference under three Cr levels supplied. Shoot Cr accumulation decreased, while root Cr concentration increased, which was ascribed to the formation of precipitation-bound, "organic matter bound" Cr and the reduction of exchangeable-bound Cr fractions in the soil. Furthermore, the rhizosphere soil pH increased with Si level under either Cr level, suggesting that exogenous Si would induce the alkalization in the rhizosphere mediated detoxification of Cr on pakchoi by promoting the formation of precipitation-bound, organic matter bound Cr in Cr-contaminated soil, thereby probably decreasing Cr uptake from Cr-contaminated soil. These results proved direct evidence that Si played a mediated role, which decreased Cr uptake and improved the stabilization of Cr in Crcontaminated soil. (C) 2013 The Authors. Published by Elsevier B.V. Open access under CC BY-NC-ND license.

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