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首页> 外文期刊>Polar biology >Response of dimethylsulfoniopropionate (DMSP) and dimethylsulfoxide (DMSO) cell quotas to salinity and temperature shifts in the sea-ice diatom Fragilariopsis cylindrus
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Response of dimethylsulfoniopropionate (DMSP) and dimethylsulfoxide (DMSO) cell quotas to salinity and temperature shifts in the sea-ice diatom Fragilariopsis cylindrus

机译：二甲基磺基丙酸酯（DMSP）和二甲基磺酰甲醚（DMSO）细胞配额对盐度和温度变化的响应 - 冰硅藻岩岩体

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摘要

Sea ice is an extreme environment known to host microbial communities which produce high concentrations of the metabolites dimethylsulfoniopropionate (DMSP) and dimethylsulfoxide (DMSO). These two compounds are involved in the cycling of the climate-cooling gas dimethylsulfide. Despite decades of research, the drivers of these large concentrations in sea ice remain largely unknown. In this study, we use a cell culture approach to quantify for the first time the DMSP and DMSO cell quotas for the diatom Fragilariopsis cylindrus under combined shifts of temperature and salinity typically encountered in the sea-ice brine habitat. In doing so, we investigate two suggested potential metabolic functions for DMSP and DMSO: osmoregulation and cryoprotection. We observed an increase of both DMSP:Chl-a and DMSO:Chl-a in multiple experiments with salinities of 75 and 100 at constant temperature, which suggest osmoregulation for both compounds in the diatom cell. Stronger salinity shifts to 150 induced lethal osmotic shock resulting in massive cell death. Interestingly, combining salinity shifts with temperature shifts (as low as - 7.4 degrees C) did not modify drastically the DMSP and DMSO cell quotas, which may indicate that the cryoprotectant function of DMSP and DMSO in our diatom cultures was not-relevant. Also, decreasing the salinity to 20 at constant temperature suggested no cellular adaptation in terms of DMSP and DMSO cell quotas.
机译：海冰是寄宿过宿主的极端环境，其产生高浓度的代谢物二甲基磺基丙酸（DMSP）和二甲基磺酰氧化物（DMSO）。这两种化合物参与了气候冷却气体二甲基硫化物的循环。尽管有数十年的研究，但海冰中这些大浓度的司机仍然很大程度上。在这项研究中，我们使用细胞培养方法来定量DIATOM Fragilariopsis圆柱体的第一次DMSP和DMSO细胞配额在海冰盐水栖息地中遇到的温度和盐度的综合变化下。在这样做时，我们调查DMSP和DMSO的两个建议的潜在代谢功能：OSMOREGULACULE和CREYOOLCONACT。我们观察到DMSP：CHL-A和DMSO的增加：CHL-A在多个实验中，在恒定温度下具有75和100的盐度，这表明硅藻土中两种化合物的OSMORICULICULIC。盐度较强转变为150诱导的致命渗透冲击，导致巨大的细胞死亡。有趣的是，将盐度与温度偏移（低至7.4摄氏度）的组合性偏移没有急剧改变DMSP和DMSO细胞配额，这可能表明DMSP和DMSO在我们的硅藻培养中的冷冻保护功能不相关。此外，在恒定温度下降低盐度至20，表明在DMSP和DMSO细胞配额方面没有细胞适应。

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