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

作者：Rai Arti; Tripathi Preeti; Dwivedi Sanjay; Dubey Sonali; Shri Manju; Kumar Smita; Tripathi Pankaj Kumar; Dave Richa; Kumar Amit; Singh Ragini; Adhikari Bijan; Bag Manas; Tripathi Rudra Deo^*; Trivedi Prabodh K; Chakrabarty Debasis; Tuli Rakesh

来源：Chemosphere, 2011, 82(7): 986-995.

DOI：10.1016/j.chemosphere.2010.10.070

• Arsenic
• Antioxidant enzymes
• Heat shock protein
• Rice
• Sulphate transporter
• Metallothionine

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-a-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 gamma-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.

• 出版日期2011-2