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首页> 外文期刊>European Journal of Phycology >Effects of UV radiation on five marine microphytobenthic Wadden sea diatoms, isolated from the Solthorn tidal flat (Lower Saxony, southern North Sea) - Part II: changes in carbohydrate, amino acid and fatty acid composition
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Effects of UV radiation on five marine microphytobenthic Wadden sea diatoms, isolated from the Solthorn tidal flat (Lower Saxony, southern North Sea) - Part II: changes in carbohydrate, amino acid and fatty acid composition

机译：紫外线对从索尔索德海潮滩（北萨克森州下萨克森州）分离的五个海洋微底栖瓦登海硅藻的影响-第二部分：碳水化合物，氨基酸和脂肪酸组成的变化

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Benthic diatoms inhabiting intertidal flats face highly variable environmental conditions, due to changing water levels and exposure during low tide. The present study is the second part of a more extensive study of the adaptive potential of these species in response to varying UV radiations in the Solthorn tidal flat (Lower Saxony, southern North Sea). Five isolates (Achnanthes exigua, Amphora exigua, Cocconeis peltoides, Diploneis littoralis and Navicula digitoradiata), which were found in this area in high cell numbers in summer 2008, were used in semi-continuous cultures to study the physiological effects of UV-radiation (PAR [photosynthetically active radiation], PAR+UV-A, PAR+UV-B, PAR+UV-B+UV-A). For short- and long-term exposures (6 h, 30 days), the composition of intercellular carbohydrates, amino and fatty acids were analysed in exponential-phase cultures grown at a salinity of 30 in a 12:12 h light:dark cycle at 20 degrees C. Although all tested species showed distinct differences in their initial carbohydrate, amino and fatty acid compositions and in their responses to the different UV treatments, general response patterns could be identified. Overall physiological responses to short- and long-term UV treatments included the accumulation of proline as well as an increase in total carbohydrates and lipids, whereas significant differences in the composition of carbohydrates, amino and fatty acids occurred after long-term exposure to the UV treatments (P < 0.05). While UV-A exposure led to higher accumulations of phenylalanine, aspartic acid and saturated fatty acids, the response to UV-B long-term exposure included increases of galactose, mannose and unsaturated fatty acids in the cells. In both UV experiments there was a noteworthy accumulation of the amino acid tryptophan in most species. The combined UV-A+UV-B experiment showed a significant (P < 0.05) increase of aspartic acid, phenylalanine, galactose and saturated fatty acids in a majority of species. Overall, the results indicated significant differences in the physiological responses of the five diatom taxa during UV exposure, which suggests species-specific acclimation strategies that may explain the growth insensitivity towards at least short-term UV.
机译：由于潮水变化和退潮期间的暴露，居住在潮间带的底栖硅藻面临着高度变化的环境条件。本研究是这些物种对Solthorn潮滩（下萨克森州，北海南部）中不断变化的紫外线辐射的适应潜力的更广泛研究的第二部分。在半连续培养中使用了五种分离株（Achnanthes exigua，Exphora exigua，Cocconis peltoides，Diploneis littoralis和Navicula digitoradiata），它们在该区域以高细胞数被发现，并在半连续培养中用于研究紫外线辐射的生理效应（ PAR [光合有效辐射]，PAR + UV-A，PAR + UV-B，PAR + UV-B + UV-A）。对于短期和长期暴露（6小时30天），在盐度为30的指数阶段培养物中，在12:12 h的光：暗循环下，以18:12的盐浓度对指数相培养物中的细胞间碳水化合物，氨基酸和脂肪酸的组成进行了分析。 20摄氏度。尽管所有测试物种在其初始碳水化合物，氨基酸和脂肪酸组成以及对不同紫外线处理的响应中均表现出明显差异，但仍可以确定一般的响应模式。短期和长期紫外线治疗的总体生理反应包括脯氨酸的积累以及总碳水化合物和脂质的增加，而长期暴露于紫外线后，碳水化合物，氨基酸和脂肪酸的组成存在显着差异治疗（P <0.05）。 UV-A暴露导致苯丙氨酸，天冬氨酸和饱和脂肪酸的积累更高，而对UV-B长期暴露的响应包括细胞中半乳糖，甘露糖和不饱和脂肪酸的增加。在两个紫外线实验中，大多数物种中氨基酸色氨酸都有明显的积累。 UV-A + UV-B组合实验表明，大多数物种中的天冬氨酸，苯丙氨酸，半乳糖和饱和脂肪酸显着增加（P <0.05）。总体而言，结果表明五个硅藻类群在紫外线照射期间的生理反应存在显着差异，这表明特定物种的适应策略可能解释了至少短期紫外线对生长不敏感。

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