期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 79, 期 -, 页码 189-198出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2011.12.019
关键词
Arsenate; Arsenate reductase; Oryza sativa; Oxidative stress; Phytochelatins; Thiol metabolism
资金
- CSIR
- (DST), New Delhi, India
- Council of Scientific and Industrial Research, New Delhi, India
The mechanism of arsenic (As) tolerance was investigated on two contrasting rice (Oryza sativa L.) genotypes, selected for As tolerance and accumulation. One tolerant (Triguna) and one sensitive (IET-4786) variety were exposed to various arsenate (0-50 mu M) levels for 7d for biochemical analyses. Arsenic induced oxidative stress was more pronounced in IET-4786 than Triguna especially in terms of reactive oxygen species, lipid peroxidation, EC and pro-oxidant enzymes (NADPH oxidase and ascorbate oxidase). However. Triguna tolerated As stress through the enhanced enzymes activities particularly pertaining to thiol metabolism such as serine acetyl transferase (SAT), cysteine synthase (CS), gamma-glutamyl cysteine synthase (gamma-ECS), gamma-glutamyl transpeptidase (gamma-GT), and glutathione-S-transferase (GST) as well as arsenate reductase (AR). Besides maintaining the ratio of redox couples GSH/GSSG and ASC/DHA, the level of phytochelatins (PCs) and phytochelatin synthase (PCS) activity were more pronounced in Triguna, in which harmonized responses of thiol metabolism was responsible for As tolerance in contrast to IET-4786 showing its susceptible nature towards As exposure. (C) 2012 Elsevier Inc. All rights reserved.
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