Combined Reproductive Effects of Imidacloprid, Acetochlor and Tebuconazole on Zebrafish (Danio rerio)
文献类型: 外文期刊
第一作者: Yang, Jin
作者: Yang, Jin;Chang, Yiming;Zhang, Yanning;Zhu, Lizhen;Mao, Liangang;Zhang, Lan;Liu, Xingang;Jiang, Hongyun
作者机构:
关键词: combined exposure; reproductive toxicity; pesticides
期刊名称:AGRICULTURE-BASEL ( 影响因子:3.408; 五年影响因子:3.459 )
ISSN:
年卷期: 2022 年 12 卷 12 期
页码:
收录情况: SCI
摘要: Pesticides usually occur as mixtures of multiple chemicals in the natural aquatic ecosystem, so research based on the toxicity data of a single compound on aquatic organisms is not enough to accurately assess the actual toxicity risk of pesticides. There is still a gap in the research on the reproductive toxicity of combined insecticides, herbicides and fungicides on zebrafish (Danio rerio). In this study, zebrafish were used to systematically investigate the separate and combined reproductive toxicity of imidacloprid (IMI), acetochlor (ACT) and tebuconazole (TBZ), which are commonly used in rice fields. Adult zebrafish were exposed to the three pesticides individually and in combination for 28 days, and the number, heartbeat, deformation rate, body length, and swim bladder development of F1 offspring embryos were observed and the reproductive hormones testosterone (T), estradiol (E2), and vitellogenin (VTG) contents and the expressions of nine reproductive genes (ar, esr2a, vtg1, gr, star, fshr, hmgcrb, 3 beta hsd and vasa) in the testes of the male and the ovaries of the female F0 zebrafish adults were measured to evaluate the individual and combined effects. The results showed that exposure to the mixtures of IMI, ACT and TBZ resulted in a decrease in heartbeat, body length and swim bladder development and an increase in the deformity rate of F1 offspring embryos compared to the individual exposure groups. In the combined exposure group, the content of T decreased significantly and the content of VTG increased significantly in the testes of the males; the content of T significantly increased, while the content of E2 and VTG significantly decreased in the ovaries of the females, indicating that combined exposure showed a more obvious endocrine-disrupting effect compared to the individual exposures. In addition, the expression of nine reproductive genes was significantly altered compared to the individual exposure groups. Therefore, our results indicated that the mixture of IMI, ACT and TBZ caused fewer number of F1 embryos, higher developmental defects of F1, greater disruption in the content of reproductive hormones and the expression of reproductive genes compared to the individual pesticides at the corresponding doses. Therefore, the presence of pesticides in mixtures in the real water environment is likely to increase the toxic reproductive effects on zebrafish and cause more serious impacts on aquatic ecosystems.
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