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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 2    February 2019

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Chromium detoxification mechanism induced growth and antioxidant responses in vetiver (Chrysopogon zizanioides(L.) Roberty)
Manikandan RAJENDRAN1, 2, AN Wen-hui(安文慧)1, LI Wai-chin(李伟展)3, Venkatachalam PERUMAL2, WU Chuan(吴川)1, Shivendra Vikram SAHI4, Santosh Kumar SARKAR5

1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Plant Genetic Engineering and Molecular Biology Lab, Department of Biotechnology, Periyar University, Salem 636 011, Tamil Nadu, India;
3. Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, Hong Kong, China;
4. Department of Biology, Western Kentucky University, Bowling Green, KY 42101-1080, USA;
5. Department of Marine Science, University of Calcutta, Calcutta 700019, West Bengal, India

Abstract:This study investigated the chromium (Cr) detoxification mechanism-induced changes in growth and antioxidant defence enzyme activities in Chrysopogon zizanioides. Plant growth decreased by 36.8% and 45.0% in the shoots and roots, respectively, in the 50 mg/L Cr treatment. Cr accumulation was higher in root (9807 μg/g DW) than in shoots (8730 μg/g DW). Photosynthetic pigments and malondialdehyde content increased up to the 30 mg/L Cr treatment, whereas they declined at higher doses. The activity of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POX) were increased significantly with increasing of Cr dose but slightly declined at higher doses. Isozyme banding patterns revealed the expression of multiple bands for SOD, CAT and POX enzymes, and the band intensity decreased at high doses of Cr exposure. These results indicate that higher Cr doses increased the oxidative stress by over production of reactive oxygen species (ROS) in vetiver that had potential tolerance mechanism to Cr as evidenced by enhanced level of antioxidative enzymes, photosynthetic pigments, MDA contents. Therefore, vetiver has evolved a mechanism for detoxification and accumulates higher concentration of toxic Cr. This study provides a better understanding of how vetiver detoxifies Cr.

 

Key words: chromium; Chrysopogon zizanioides; detoxification mechanism; antioxidant enzymes; phytoremediation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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