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首页> 外文期刊>Chemosphere >Dynamic changes of rhizosphere properties and antioxidant enzyme responses of wheat plants (Triticum aestivum L.) grown in mercury-contaminated soils
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Dynamic changes of rhizosphere properties and antioxidant enzyme responses of wheat plants (Triticum aestivum L.) grown in mercury-contaminated soils

机译：在汞污染土壤中生长的小麦植物（Triticum aestivum L.）的根际特性和抗氧化酶响应的动态变化

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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-contam-inated 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.
机译：进行了盆栽试验，研究了在三种含汞污染土壤中生长的小麦植株（Triticum aestivum L.）的根际特性和抗氧化酶响应的动态变化。小麦植株根际土壤溶液中可溶性Hg和可溶性有机碳（DOC）的浓度通过播种前的顺序＞三叶期＞排便期来表征，而土壤溶液的pH呈相反的分布规律。汞胁迫下小麦植株中抗氧化酶的活性发生了显着变化。在高污染土壤中生长的小麦植株中观察到的超氧化物歧化酶（SOD），过氧化氢酶（CAT）和抗坏血酸过氧化物酶（APX）的活性高于在轻度污染土壤中生长的小麦（在三叶期增加了11-27％，在26时增加了26） -70％在换手阶段）；但是，将汞的浓度增加到严重污染的水平会导致酶活性降低。目前的研究结果表明，小麦植物可以积极适应环境中的汞胁迫，其根际酸化，DOC产量的增加和更大的抗氧化酶活性可能是在汞中生长的小麦植物根际金属吸收/耐性的三个重要机制。污染的土壤。

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  • 来源
    《Chemosphere》 |2013年第6期|972-977|共6页
  • 作者

    Yonghua Li; Hongfei Sun; Hairong Li; Linsheng Yang; Bixiong Ye; Wuyi Wang;

  • 作者单位

    Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;

    Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China,College of Environment and Plant Protection, Hainan University, Haikou 570228, China;

    Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;

    Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;

    Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;

    Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Mercury; Rhizobox; Rhizosphere soil solution; Antioxidants; Triticum aestivum L.;

    机译：汞;根瘤菌根际土壤溶液;抗氧化剂;普通小麦;

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