一种毒性较低的Microcystis aeruginosa菌株真的毒性更低吗?
Jun Xu1, Xuexiu Chang2, Hugh J MacIsaac3
1Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, School of Ecology and Environmental Science, Yunnan University, Kunming 650091, China.
Aquatic toxicology (Amsterdam, Netherlands)
|September 30, 2023
概括
蓝藻细菌的繁殖带来了超越微囊的风险. 这项研究表明,Microcystis排泄物对Daphnia magna有毒,静止阶段细胞和较低的微囊素菌株更有害.
科学领域:
- 环境毒理学环境毒理学
- 水生生态学 水生生态学
- 微生物学 微生物学
背景情况:
- 像Microcystis aeruginosa这样的开花的蓝藻细菌产生有毒的代谢物,如微囊 (MCs).
- 蓝藻细菌排泄物的毒性及其对生长阶段的依赖性仍然不太清楚.
- 蓝藻细菌排泄物中的其他生物活性化学物质可能会导致毒性.
研究的目的:
- 为了比较Microcystis aeruginosa从不同生长阶段和微囊素 (MC) 生产水平的排泄物 (MaE) 的毒性.
- 调查MaE对大夫尼亚大的生理影响,包括线粒体功能障碍,氧化应激和过活动.
- 评估花期和菌株特异性毒素对水生生态系统的影响.
主要方法:
- 从两个产生MC的Microcystis aeruginosa菌株的排泄物在指数增长和静止增长阶段收集.
- 在Daphnia magna上进行了毒性实验,使用急性和慢性暴露于MaE.
- 评估的生理反应包括线粒体膜潜力,氧化应激,脂质过氧化,过率和心率.
主要成果:
- 所有的MAE治疗都在Daphnia magna中诱导了线粒体功能障碍和心率异常.
- 静态相细胞的排泄物比指数相细胞的排泄物更有毒.
- 一个MC产量较低的Microcystis菌株表现出比MC产量较高的菌株有更高的毒性.
结论:
- 微囊的开花可以根据生长阶段和菌株特定的化学特征对水生无脊椎动物产生不同的影响.
- 毒性不仅仅取决于微囊素水平;排泄物中的其他生物活性化合物也起着重要作用.
- 监测工作应考虑具有较低MC产生能力的Microcystis菌株,因为其可能释放其他有害物质.
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