Particulate dimethyl sulphoxide in seawater:production by microplankton
Particulate dimethyl sulphoxide in seawater:production by microplankton
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DOI：
10.3354/meps167291
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发表时间：
1998-06
影响因子：
2.5
通讯作者：
R. Simó;A. Hatton;G. Malin;P. Liss
中科院分区：
文献类型：
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作者：
R. Simó;A. Hatton;G. Malin;P. Liss
二甲基亚砜（DMSO）是海水中溶解的二甲基硫的主要来源。然而，这种化合物在海洋环境中的来源和归宿及其在二甲基硫醚生物地球化学循环中的作用仍不清楚。在含氧海水中形成DMSO的唯一既定途径是DMS的光化学氧化。目前尚不清楚是否存在重要的生物生产途径。在北海沿海沃茨和海洋单细胞藻类培养物中甲基化硫形态的研究中，我们分别测量了纳摩尔和微摩尔浓度的微粒DMSO（DMSO（p））池。大小分级的海水颗粒物和培养实验的分析提供的证据表明，DMSO（p）与微生物相关。对数期培养的前沟藻和Emiliania huxleyi表现出细胞内二甲基磺基丙酸酯（DMSP）DMSO的摩尔比分别为25和8。我们的研究结果有力地表明，存在的生物生产和释放的DMSO在真核浮游生物。
Dimethyl sulphoxide (DMSO) represents a major pool of dissolved dimethylated sulphur in seawater. However, the origin and fate of this compound in the marine environment, and its role in the biogeochemical cycle of dimethyl sulphide (DMS), remain unclear. The only established route for the formation of DMSO in oxygenated seawater is photochemical oxidation of DMS. It is not known whether significant biotic production pathways exist. In a study of methylated sulphur speciation in coastal North Sea waters and cultures of marine unicellular algae, we measured pools of particulate DMSO (DMSO(p)) at nanomolar and micromolar concentrations, respectively. Analyses of size-fractionated seawater particulates and incubation experiments provided evidence that DMSO(p) was associated with microplanktonic organisms. Log-phase cultures of Amphidinium carterae and Emiliania huxleyi exhibited intracellular dimethylsulphoniopropionate (DMSP) to DMSO molar ratios of 25 and 8, respectively. Our results strongly suggest the existence of biological production and release of DMSO in eukaryotic microplankton.