乙化对微藻和细菌之间的共生关系的影响
Zikang Wang1, Simin Yu1, Yufan Nie1
1Department of Applied Chemistry, China Agricultural University, Yuanmingyuan West Road 2, Beijing 100193, China.
Journal of hazardous materials
|November 4, 2023
概括
乙化 (ACT) 压力将共生细菌从互惠转向利用藻类,增强ACT降解,但增加藻类损害. 这影响了藻类-细菌互惠性和生态毒理学影响下的生存.
科学领域:
- 环境微生物学 环境微生物学
- 生态毒理学 生态毒理学
- 同生相互作用的交互.
背景情况:
- 藻类和细菌之间的共生关系在水生生态系统中至关重要.
- 酸盐 (ACT) 是一种被广泛使用的除草剂,可以影响水生生物.
- 了解除草剂对藻类-细菌共生的作用对于生态风险评估至关重要.
研究的目的:
- 为了研究酸盐 (ACT) 对Scenedesmus obliquus和共生细菌 (SOB-1,SOB-2) 之间的相互关系的影响.
- 确定共生细菌在压力条件下的ACT降解中的作用.
- 阐明细菌行为从相互主义转向在不同ACT度下进行利用的转变.
主要方法:
- 从Scenedesmus obliquus中分离出共生细菌 (SOB-1,SOB-2) 的研究结果.
- 在不同ACT度下建立藻类-细菌共同培养 (2.025.0μg/L).
- 评估ACT降解,藻类生理压力 (代谢,氧化,亡,溶解),生物圈碳水化合物减少以及藻类抗菌物质水平.
- 使用葡萄糖酶抑制剂确定细菌利用途径.
- 对物种间相互作用系数和人口动态建模的分析.
主要成果:
- 在7天内,共生细菌提高了ACT降解率,达到226.9% (SOB-1) 和193.0% (SOB-2).
- 较高的ACT度加剧了藻类的代谢压力,氧化损伤,亡和细胞溶解.
- ACT降低了自然界的碳水化合物 (高达31.5%) 和藻类的抗菌物质 (脂肪酸,化合物高达58.1%,56.6%).
- 在ACT度为7.9和25.0μg/L时,细菌从互惠转向利用.
- 人口动态表明,与在ACT压力下的藻相比,藻-细菌系统可能更早地灭绝.
结论:
- 酸盐 (ACT) 破坏了藻类-细菌共生的微妙平衡,导致从互惠转向细菌剥削.
- 虽然细菌可以降解ACT,但这是以增加藻类压力和损伤为代价的.
- ACT对藻类抗菌物质的生态毒理效应和植物圈的组成有助于细菌的利用.
- 在物种间相互作用中,ACT诱导的变化对藻类-细菌系统的稳定性和生存构成威胁.
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