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题名: Accumulation and phytotoxicity of technical hexabromocyclododecane in maize
作者: Wu, Tong; Huang, Honglin; Zhang, Shuzhen
刊名: JOURNAL OF ENVIRONMENTAL SCIENCES
出版日期: 2016-04
卷号: 42, 期号:0, 页码:97-104
关键词: Technical hexabromocyclododecane ; (HBCD) ; Plant uptake ; Oxidative toxicity ; DNA damage
DOI: 10.1016/j.jes.2015.06.018
部门归属: 环境化学与生态毒理学国家重点实验室
英文摘要: To investigate the accumulation and phytotoxicity of technical hexabromocyclododecane (HBCD) in maize, young seedlings were exposed to solutions of technical HBCD at different concentrations. The uptake kinetics showed that the HBCD concentration reached an apparent equilibrium within 96 hr, and the accumulation was much higher in roots than in shoots. HBCD accumulation in maize had a positive linear correlation with the exposure concentration. The accumulation of different diastereoisomers followed the order gamma-HBCD > beta-HBCD > alpha-HBCD. Compared with their proportions in the technical HBCD exposure solution, the diastereoisomer contribution increased for beta-HBCD and decreased for alpha-HBCD in both maize roots and shoots with exposure time, whereas the contribution of beta-HBCD increased in roots and decreased in shoots throughout the experimental period. These results suggest the diastereomer-specific accumulation and translocation of HBCD in maize. Inhibitory effects of HBCD on the early development of maize followed the order of germination rate > root biomass >= root elongation > shoot biomass >= shoot elongation. Hydroxyl radical (center dot OH) and histone H2AX phosphorylation (gamma-H2AX) were induced in maize by HBCD exposure, indicative of the generation of oxidative stress and DNA double-strand breaks in maize. An center dot OH scavenger inhibited the expression of gamma-H2AX foci in both maize roots and shoots, which suggests the involvement of center dot OH generation in the HBCD-induced DNA damage. The results of this study will offer useful information for a more comprehensive assessment of the environmental behavior and toxicity of technical HBCD. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35795
Appears in Collections:环境化学与生态毒理学国家重点实验室_期刊论文

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