Arsenate and arsenite exposure modulate antioxidants and amino acids in contrasting arsenic accumulating rice (Oryza sativa L.) genotypes

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• 作者：Richa Dave ; Rudra Deo Tripathi ; Sanjay Dwivedi ; Preeti Tripathi ; Garima Dixit ; Yogesh Kumar Sharma ; Prabodh Kumar Trivedi ; Francisco J. Corpas ; Juan B. Barroso ; Debasis Chakrabarty
• 关键词：Amino acids ; Antioxidants ; Arsenic accumulation ; Oryza sativa
• 刊名：Journal of Hazardous Materials
• 出版年：15 November, 2013
• 年：2013
• 卷：262
• 期：Complete
• 页码：1123-1131
• 全文大小：4531 K

文摘

Carcinogenic arsenic (As) concentrations are found in rice due to irrigation with contaminated groundwater in South-East Asia. The present study evaluates comparative antioxidant property and specific amino acid accumulation in contrasting rice genotypes corresponding to differential As accumulation during arsenate (As^V) and arsenite (As^III) exposures. The study was conducted on two contrasting As accumulating rice genotypes selected from 303 genotype accessions, in hydroponic conditions. Maximum As accumulation was up to 1181 渭g g^鈭? dw in the roots of high As accumulating genotype (HARG), and 89 渭g g^鈭? dw in low As accumulating genotype (LARG) under As^III exposures. The inorganic As was correlated more significantly upon exposures to As^III than As^V. In the presence of As^V various antioxidant enzymes guiacol peroxidase (GPX), ascorbate peroxidase (APX) and superoxide dismutase (SOD) were highly stimulated in HARG. The stress responsive amino acids proline, cysteine, glycine, glutamic acid and methionine showed higher accumulation in HARG than LARG. A clear correlation was found between stress responsive amino acids, As accumulation and antioxidative response. The comparisons between the contrasting genotypes helped to determine the significance of antioxidants and specific amino acid response to As stress.