在海洋藻类中对DMSP和DMS具有抗氧化作用
W Sunda1, D J Kieber, R P Kiene
1Beaufort Laboratory, National Oceanic and Atmospheric Administration, Beaufort, North Carolina 28516, USA. bill.sunda@noaa.gov
Nature
|July 19, 2002
概括
甲基硫烯酸盐 (DMSP) 和其分解产物甲基硫化物 (DMS) 在藻类中起到抗氧化作用. 环境压力因素增加DMSP和DMS,可能通过海洋-大气反循环影响气候.
科学领域:
- 海洋生物学 海洋生物学
- 生物地质化学生物地质化学
- 化学海洋学 化学海洋学
背景情况:
- 甲基硫胺 (DMSP) 和甲基硫化物 (DMS) 是全球硫循环中的关键化合物.
- 藻类中DMSP和DMS的确切生理作用在很大程度上仍未确定.
研究的目的:
- 研究DMSP及其分解产物的生理功能.
- 探索DMSP及其衍生物在海洋藻类中的潜在抗氧化作用.
- 了解环境压力因素如何影响植物浮游生物中的DMSP和DMS动态.
主要方法:
- 在各种压力条件下分析DMSP及其分解产物.
- 测量反应性氧物种的清理能力.
- 在受控的实验室条件下培养海藻.
主要成果:
- DMSP及其分解产物 (DMS,烯酸,二甲基硫氧化物,甲硫酸) 显示出大量的基基和活性氧物种的清除.
- 氧化应激因素,包括太阳紫外线辐射,二氧化碳限制,铁限制,高Cu2+和H2O2,发现在海洋藻类培养物中增加细胞DMSP和/或其溶解为DMS.
- 观察到这些压力因素与海洋浮游植物中DMSP和DMS的动态之间存在直接相关性.
结论:
- DMSP及其分解产物可能在藻类中起到抗氧化系统的作用,部分受酶DMSP裂变的调节.
- 环境压力因素直接影响植物中的DMSP和DMS水平,影响DMS的产生和大气释放.
- 这些发现表明氧化应激因素可能会调解影响全球气候和水文循环的海洋-大气反循环.
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