Dynamic changes of rhizosphere properties and antioxidant enzyme responses of wheat plants (Triticum aestivum L.) grown in mercury-contaminated soils
文献类型：SCI/SSCI论文
| 作者 | Li Y. H. ; Sun H. F. ; Li H. R. ; Yang L. S. ; Ye B. X. ; Wang W. Y. |
| 发表日期 | 2013 |
| 关键词 | Mercury Rhizobox Rhizosphere soil solution Antioxidants Triticum aestivum L. induced oxidative stress southwestern china organic-acids metal uptake zea-mays toxicity cadmium tolerance copper accumulation |
| 英文摘要 | A pot experiment was conducted to investigate the dynamic changes in the rhizosphere properties and antioxidant enzyme responses of wheat plants (Triticum aestivum L) grown in three levels of Hg-contaminated soils. The concentrations of soluble Hg and dissolved organic carbon (DOC) in the rhizosphere soil solutions of the wheat plants were characterised by the sequence before sowing > trefoil stage > stooling stage, whereas the soil solution pH was found to follow an opposite distribution pattern. The activities of antioxidant enzymes in wheat plants under Hg stress were substantially altered. Greater superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX) activities were observed in the wheat plants grown in a highly polluted soil than in a slightly polluted soil (with increases of 11-27% at the trefoil stage and 26-70% at the stooling stage); however, increasing concentrations of Hg up to seriously polluted level led to reduced enzyme activities. The present results suggest that wheat plants could positively adapt to environmental Hg stress, with rhizosphere acidification, the enhancement of DOC production and greater antioxidant enzyme activities perhaps being three important mechanisms involved in the metal uptake/tolerance in the rhizospheres of wheat plants grown in Hg-contaminated soils. (C) 2013 Elsevier Ltd. All rights reserved. |
| 出处 | Chemosphere |
| 卷 | 93 |
| 期 | 6 |
| 页 | 972-977 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0045-6535 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/30434]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Li Y. H.,Sun H. F.,Li H. R.,et al. Dynamic changes of rhizosphere properties and antioxidant enzyme responses of wheat plants (Triticum aestivum L.) grown in mercury-contaminated soils. 2013. |
入库方式： OAI收割
来源：地理科学与资源研究所
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