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Toxicity Of Different Forms Of Antimony To Rice Plant: Effects On Root Exudates, Cell Wall Components, Endogenous Hormones And Antioxidant System

文献类型： 外文期刊

作者： Feng, RW; Lei, L; Su, JM; Zhang, RR; Zhu, YM; Chen, WX; Wang, LZ; Wang, RJ; Dai, JX; Lin, ZT; Li, YP; Liu, BX; Fan, ZL; Liu, H; Rensing, C

作者机构：

关键词： Antimonite; Antimonate; Pectin; Lignin; Abscisic Acid

期刊名称： SCIENCE OF THE TOTAL ENVIRONMENT

ISSN： 0048-9697

年卷期： 2020 年 711 卷

页码：

收录情况： JCR（2021版） ; EI（2021版）

摘要： Antimony (Sb) is a toxic element for both human and plants, but the toxic responses of plants to different forms of antimony and the associated mechanisms are unknown. This study was carried out to investigate the effects of different forms of Sb [Sb(III) and Sb(V)] on the root exudates, root endogenous hormones, root cell wall components and antioxidant systems in rice plant via three hydroponic experiments. The results showed that Sb(III) displayed a higher toxicity than Sb(V) to the plant which accumulated much more Sb in its tissues under Sb(III) exposure than that under Sb(V) exposure. Under Sb(III) exposure, most of absorbed Sb was found to be Sb(III) in the shoots and roots; however when plants were exposed to Sb(V), most of absorbed Sb in this rice plant was Sb(V). Only two kinds of endogenous hormones were detected as abscisic acid (ABA) and salicylic acid (SA). The addition of Sb(III) significantly increased the content of ABA but Sb(V) did not, probably suggesting the higher toxicity of Sb(III) than Sb(V) might be due to the stimulation of ABA content. The addition of Sb(III) significantly increased the concentration of oxalic acid but decreased the concentrations of formic, acetic and maleic acids. Sb(V) also enhanced the oxalic acid concentration at 20 mg L (1) Sb(V) treatment level but reduced the concentrations of formic and acetic acids. Different forms of Sb dose-dependently increased the content of pectin, but significantly enhanced the content of lignin in cell wall. Different forms of Sb induced oxidative stress, but rice plant triggered the activities of superoxide dismutase (SOD) and ascorbate peroxidase (APX) to counteract the oxidative stress. (C) 2019 Elsevier B.V. All rights reserved.

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