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首页> 外文期刊>Diatom Research >Compatible solutes and fatty acid composition of five marine intertidal microphytobenthic Wadden Sea diatoms exposed to different temperature regimes
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Compatible solutes and fatty acid composition of five marine intertidal microphytobenthic Wadden Sea diatoms exposed to different temperature regimes

机译：暴露于不同温度下的五种海洋潮间微底栖瓦登海硅藻的相容性溶质和脂肪酸组成

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摘要

Microphytobenthic organisms inhabiting marine intertidal areas are subjected to strongly changing temperature and surface light regimes due to evaporation at low tide. In addition, seasonal fluctuations in temperatures significantly influence the taxonomic composition of benthic diatom communities in intertidal flats. In order to determine the physiological responses of marine benthic diatoms to temperature changes, five common species (Achnanthes brevipes C.A. Agardh, Amphora arenaria Donkin,Cocconeis peltoides Hustedt, Navicula digitoradiata (Gregory) Ralfs and N. gregaria Donkin), isolated from the Solthorn tidal flats, were chosen to study the effect of different temperatures (4, 18 and 35 degrees C) on the composition of intercellular free amino and fatty acids as well as the accumulation of polyols, saccharides and quaternary ammonium compounds (QUARCs) during short- (24h) and long-term (30d) exposures. Although the growth response of the five diatom taxa was hardly affected by temperatures in short-term temperature treatments, the growth rates were significantly lower after long-term treatments maintained at 4 and 35 degrees C. Significant differences were found in physiological responses to temperature treatments of the species tested. In experimental temperature treatments, species accumulated proline, glycerol and glucose, whereas the species in high-temperature treatments also accumulated short-chain fatty acids. By contrast, the responses to low-temperature treatments comprised accumulation of the QUARCs homarine and glycine-betaine as well as -dimethylsulfoniopropionate (DMSP) and polyunsaturated fatty acids (PUFAs). In conclusion, these results showed common resistance mechanisms to temperature stresses in marine benthic diatoms, with species-specific differences in compound composition (e.g., proline). The significant differences in osmolyte compositions of the five diatom taxa during high- and low-temperature exposure suggest a species-specific physiological acclimation that may explain their growth-insensitivity towards short-term temperature variations.
机译：由于潮汐下的蒸发，居住在潮间带地区的微底栖生物受到温度和表面光的强烈变化。此外，温度的季节性波动显着影响潮间带底栖硅藻群落的分类学组成。为了确定海洋底栖硅藻对温度变化的生理反应，从Solthorn潮汐中分离出五个常见物种（Achnanthes brevipes CA Agardh，Amphora arenaria Donkin，Cocconeis peltoides Hustedt，Navigula digitoradiata（Gregory）Ralfs和N. gregaria Donkin）。选择平地来研究不同温度（4、18和35摄氏度）对短时（-）期间细胞间游离氨基酸和脂肪酸组成以及多元醇，糖和季铵化合物（QUARCs）积累的影响24小时）和长期（30天）暴露。尽管在短期温度处理中，五个硅藻类群的生长反应几乎不受温度的影响，但在将长期处理温度保持在4和35摄氏度后，生长速率明显降低。对温度处理的生理反应存在显着差异测试的物种。在实验温度处理中，物质积累了脯氨酸，甘油和葡萄糖，而在高温处理中的物质也积累了短链脂肪酸。相比之下，对低温处理的响应包括QUARCs松氨酸和甘氨酸-甜菜碱以及-二甲基磺基丙酸酯（DMSP）和多不饱和脂肪酸（PUFA）的积累。总之，这些结果表明了海洋底栖硅藻对温度应力的常见抵抗机制，且化合物成分（例如脯氨酸）的物种特异性不同。高温和低温暴露期间，五个硅藻类群的渗透液成分的显着差异表明特定物种的生理适应性可能解释了它们对短期温度变化的不敏感性。

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