| 朱婷婷,王玉军,周东美,施维林,党菲.Sb(Ⅲ)和Sb(Ⅴ)对水稻根伸长抑制的生态毒性研究[J].农业环境科学学报,2018,37(9):1811-1817. |
| Sb(Ⅲ)和Sb(Ⅴ)对水稻根伸长抑制的生态毒性研究 |
| Ecotoxicity of Sb (Ⅲ) and Sb (Ⅴ) on rice by relative root elongation experiments |
| 投稿时间：2017-12-12 |
| DOI：10.11654/jaes.2017-1701 |
| 中文关键词: 锑 水稻 吸收 酶 毒性 |
| 英文关键词: antimony rice absorptive enzymes toxicity |
| 基金项目:国家重点研发计划项目（2016YFD0800407）；国家自然科学基金项目（41422105）；中国科学院科技服务网络计划项目（KFJ-STS-ZDTP-005） |
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| 中文摘要: |
| 通过水培实验研究了Sb（Ⅲ）和Sb（Ⅴ）对水稻根伸长抑制的生态毒性。本文以Sb为典型有毒污染物，基于水稻根伸长实验研究了Sb（Ⅲ）和Sb（Ⅴ）两种形态的Sb对44种水稻的生态毒性，并选取两种对Sb敏感的和耐性的水稻品种，研究两种形态Sb的毒性机理。研究发现Sb（Ⅲ）对水稻根伸长的毒性显著大于Sb（Ⅴ），44种水稻的EC50，Sb（Ⅲ）值范围是0.82~100.24 mg·L-1，EC50，Sb（Ⅴ）值的范围是13.34~766.78 mg·L-1。受试的44个品种中，扬粳687对Sb（Ⅲ）较为敏感，其EC50值为0.82 mg·L-1，而徐旱1号对Sb（Ⅲ）较耐性，其EC50值为100.27 mg·L-1，两者相差122倍；深两优5183是Sb（Ⅴ）的敏感品种，其EC50值为13.34 mg·L-1，紫香米则是耐性品种，其EC50值为776.78 mg·L-1，两者相差58倍。分析了水稻根部的SOD酶和MDA含量，发现Sb胁迫下水稻根部的SOD酶活力增加，MDA含量增加，表明水稻根部受到了Sb的毒害，可能致毒机制是氧化胁迫。结果表明：Sb（Ⅲ）和Sb（Ⅴ）对水稻根伸长均有抑制作用，且Sb（Ⅲ）的抑制作用大于Sb（Ⅴ）的抑制作用。 |
| 英文摘要: |
| This study was conducted to investigate the ecotoxicity of Sb (Ⅲ) and Sb (Ⅴ) on rice by relative root elongation experiments using a hydroponic culture system containing solution. In the present study, the toxicity of antimonite and antimonate on the selected 44 varieties of rice was studied by their relative root elongations, and two varieties of rice sensitive and tolerant to antimonite and antimonate were selected to explore the mechanism of Sb toxicity. The results showed that the toxicity of Sb (Ⅲ) to rice root elongation was significantly greater than that of Sb (Ⅴ). In the 44 kinds of rice, the value of EC50, Sb (Ⅲ) was in the range of 0.82 to 100.24 mg·L-1, while, the value of EC50, Sb (Ⅴ) was in the range of 13.34 to 766.78 mg·L-1. Yangjing 687 was more sensitive to Sb (Ⅲ) with an EC50 of 0.82 mg·L-1, and Xuhan 1 was more obtuse to Sb (Ⅲ) and the EC50 value was 100.27 mg·L-1, the difference between the tolerant and sensitive rice being 122 folds. Shenliangyou 5183 was more sensitive to Sb (Ⅴ) and the EC50 value was 13.34 mg·L-1, and Zixiangmi was more obtuse to Sb (Ⅴ) and the EC50 value was 776.78 mg·L-1, the difference between the tolerant and sensitive rice being 58 folds. The SOD and MDA contents of the 4 kinds of rice were measured, and it was found that the SOD enzyme activity and MDA contents were higher in the roots of rice plants exposed to Sb, which indicated that the roots were poisoned by Sb, and the mechanism of toxicity might be oxidative stress. The results suggested that the rice plant might be subdued by Sb (Ⅲ) and Sb (Ⅴ), and that the inhibitory effect of Sb (Ⅲ) was greater than that of Sb (Ⅴ). |
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