Arsenic tolerances in rice (Oryza sativa) have a predominant role in transcriptional regulation of a set of genes including sulphur assimilation pathway and antioxidant system - PubMed (original) (raw)
doi: 10.1016/j.chemosphere.2010.10.070. Epub 2010 Nov 13.
Preeti Tripathi, Sanjay Dwivedi, Sonali Dubey, Manju Shri, Smita Kumar, Pankaj Kumar Tripathi, Richa Dave, Amit Kumar, Ragini Singh, Bijan Adhikari, Manas Bag, Rudra Deo Tripathi, Prabodh K Trivedi, Debasis Chakrabarty, Rakesh Tuli
Affiliations
- PMID: 21075415
- DOI: 10.1016/j.chemosphere.2010.10.070
Arsenic tolerances in rice (Oryza sativa) have a predominant role in transcriptional regulation of a set of genes including sulphur assimilation pathway and antioxidant system
Arti Rai et al. Chemosphere. 2011 Feb.
Abstract
World wide arsenic (As) contamination of rice has raised much concern as it is the staple crop for millions. Four most commonly cultivated rice cultivars, Triguna, IR-36, PNR-519 and IET-4786, of the West Bengal region were taken for a hydroponic study to examine the effect of arsenate (As(V)) and arsenite (As(III)) on growth response, expression of genes and antioxidants vis-à-vis As accumulation. The rice genotypes responded differentially under As(V) and As(III) stress in terms of gene expression and antioxidant defences. Some of the transporters were up-regulated in all rice cultivars at lower doses of As species, except IET-4786. Phytochelatin synthase, GST and γ-ECS showed considerable variation in their expression pattern in all genotypes, however in IET-4786 they were generally down-regulated in higher As(III) stress. Similarly, most of antioxidants such as superoxide dismutase (SOD), ascorbate peroxidase (APX), guaiacol peroxidase (GPX), catalase (CAT), monodehydroascorbate reductase (MDHAR) and dehydroascorbate reductase (DHAR) increased significantly in Triguna, IR-36 and PNR-519 and decreased in IET-4786. Our study suggests that Triguna, IR-36 and PNR-519 are tolerant rice cultivars accumulating higher arsenic; however IET-4786 is susceptible to As-stress and accumulates less arsenic than other cultivars.
Copyright © 2010 Elsevier Ltd. All rights reserved.
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