DMSO在海洋浮游植物中具有潜在的光保护和抗氧化功能
Brandon J McNabb1, Philippe D Tortell1,2
1Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada.
PloS one
|February 6, 2025
概括
在海洋浮游植物中,二甲基硫氧化物 (DMSO) 降解为二甲基硫化物 (DMS) 起到抗氧化作用. 这一过程清除了多余的光能,并在光应激下减轻了反应性氧物种 (ROS).
科学领域:
- 海洋生物地质化学海洋生物地质化学
- 植物浮游生物生理学 生理学
- 大洋硫循环的海洋硫循环.
背景情况:
- 二甲基硫氧化物 (DMSO) 是海洋中主要的减少有机硫化合物.
- DMSO降解为二甲基硫化物 (DMS) 的生理作用和环境驱动因素尚未完全理解.
- DMS是一种气候活性气体,对大气化学和云形成有影响.
研究的目的:
- 研究DMSO减少在海洋浮游植物中的生理作用.
- 确定控制DMSO降解途径的环境因素.
- 阐明光应激与植物浮游生物中DMSO减少之间的联系.
主要方法:
- 在自然植物浮游生物组合上进行了同位素追踪器实验.
- 植物浮游生物暴露在不同的光线条件下 (适应低光照射,然后是高辐射).
- 测量包括DMSO减少率,非光化学火,以及光合作用抑制剂 (DCMU) 的作用.
主要成果:
- 在低光适应后,暴露于高辐射的植物浮游生物中,DMSO的减少率显著增加.
- 增加的DMSO减少与非光化学火有负相关性,这表明了另一种能量消耗途径.
- 通过DCMU抑制光合作用电子传输,显著降低了DMSO的降解率,将该过程与光合作用衍生的电子联系起来.
结论:
- 将DMSO减少为DMS,通过清除多余的光能,在植物浮游生物中起到抗氧化作用.
- 这一途径有助于在光应激条件下减轻反应性氧物种 (ROS) 的形成.
- 由辐射和垂直混合驱动的光应激增强了DMSO的减少,将DMS生产与光的可用性和海洋动态联系起来.
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