孵化
生物
草甘膦
胚胎
人类受精
胚胎发生
幼虫
毒性
达尼奥
发育毒性
毒理
施肥
斑马鱼
男科
解剖
植物
动物科学
生态学
细胞生物学
化学
生殖技术
生物化学
有机化学
基因
医学
怀孕
遗传学
妊娠期
作者
Laíse da Silva Durante,Gabriela Hollmann,Evelise Maria Nazari
摘要
Abstract Glyphosate‐based herbicides (GBH) have been commonly used in agriculture to inhibit weed growth and increase yields. However, due to the high solubility of these herbicides in water, they can reach aquatic environments, by infiltration, erosion, and/or lixiviation, affecting non target organisms. Thus, this study aimed to characterize the toxicity of GBH Roundup WG® (RWG®) during the embryonic and larval development of Danio rerio . Embryos (3 hours post fertilization, hpf–until hatching) and larvae (3 days post fertilization, dpf to 6 dpf) were exposed to concentrations of 0.065 and 6.5 mg L −1 . They were evaluated for survival, hatching, spontaneous movements, heartbeat, morphology, and morphometry by in vivo photographs in microscope, cell proliferation and apoptosis by immunohistochemistry, and exploratory behavior and phototropism by video recording. Our results showed an increase in embryo and larvae mortality in those exposed to 0.065 mg L −1 , as well as a reduction in spontaneous embryo movements. The larval heartbeats showed a decrease at 4 dpf in the group exposed to 0.065 mg L −1 and an increase at 5 and 6 dpf in both exposed groups. Cell proliferation was reduced in both groups exposed in embryos and only in the 0.065 mg L −1 group in larvae, while cell death increased in embryos exposed to 6.5 mg L −1 . These results demonstrated the toxic effect of low concentrations of the herbicide RWG® during embryonic and larval development of non target organisms, as well as the importance of constantly reviewing acceptable limits for exposure in natural environments.
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