John Wiley & Sons, Ltd.

Effects of Bisphenol A on antioxidant system in soybean seedling roots

Bisphenol A (BPA), an emerging pollutant in the environment, with potential toxic effects on plants; however, the toxicity mechanism remains largely unknown. The antioxidant system plays an important role in protecting plants against the damage of stress. Here, the effects of BPA on the antioxidant system [superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), ascorbic acid (AsA), proline, reduced glutathione (GSH)], reactive oxygen species [ROS, hydrogen peroxide (H2O2), superoxide anion (O2—)] accumulation and membrane lipid peroxidation [malondialdehyde (MDA), cell membrane permeability] in soybean seedling roots were investigated. The 1.5 mg L−1 BPA exposure didn't affect test indices in the roots. The exposure to 3.0, 6.0, 12.0 or 24.0 mg L−1 BPA caused increases in the SOD (except for 3.0 mg L−1 BPA) and CAT activities as well as the AsA, proline and GSH (except for 3.0 mg L−1 BPA) contents, leading to increases in the H2O2 and O2— contents and to membrane lipid peroxidation. The 48.0 or 96.0 mg L−1 exposure BPA caused decreases in the CAT activity and AsA/GSH content as well as increases in the SOD and POD activities and the proline content, leading to excess ROS accumulation (i.e. H2O2 and O2—) and cell membrane damage. After withdrawal of BPA exposure, ROS accumulation and membrane lipid peroxidation were alleviated through regulating special antioxidant enzyme or substance. This article is protected by copyright. All rights reserved

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