Responses of a marine red tide alga Skeletonema costatum (Bacillariophyceae) to long-term UV radiation exposures.
Responses of a marine red tide alga Skeletonema costatum (Bacillariophyceae) to long-term UV radiation exposures.
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海洋赤潮藻中肋骨条藻（硅藻纲）对长期紫外线辐射暴露的反应。
DOI：
10.1016/j.jphotobiol.2008.10.005
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发表时间：
2009-02
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已知紫外线辐射(280-400 nm)对浮游植物的影响有负的、中性的和正的，这取决于辐射能量的种类或水平。然而，关于赤潮藻类的光合作用生理和生长在长期内如何响应紫外线的报道很少。用UV-A(320-400 nm)或UV-A+UV-B(295-400 nm)模拟太阳辐射，对海洋赤潮硅藻中肋骨条藻细胞进行了为期6天的光合作用和生长变化的研究。UV-B的存在不断降低PSII的有效光合量子效率，导致细胞完全生长抑制和死亡。当UV-B或UV-B+UV-A被屏蔽后，生长速度开始下降，但随后又恢复。紫外线吸收化合物和类胡萝卜素随着紫外线照射的增加而增加。然而，在持续暴露于恒定水平的UV-B(0.09WmDNA加权的−2)下，与增加的类胡萝卜素或紫外线吸收化合物相关的光保护机制并不充分。相比之下，在太阳辐射屏蔽UV-B的情况下，光保护首先是通过增加类胡萝卜素，然后增加紫外线吸收化合物来实现的。这种赤潮藻类对持续的紫外线暴露的总体反应表明，中肋骨条藻是一个对UV-B敏感的物种，UV-B辐射的增加会影响其水华的形成。
UV radiation (280–400nm) is known to affect phytoplankton in negative, neutral and positive ways depending on the species or levels of irradiation energy. However, little has been documented on how photosynthetic physiology and growth of red tide alga respond to UVR in a long-term period. We exposed the cells of the marine red tide diatom Skeletonema costatum for 6 days to simulated solar radiations with UV-A (320–400nm) or UV-A+UV-B (295–400nm) and examined their changes in photosynthesis and growth. Presence of UV-B continuously reduced the effective photosynthetic quantum yield of PSII, and resulted in complete growth inhibition and death of cells. When UV-B or UV-B+UV-A was screened off, the growth rate decreased initially but regained thereafter. UV-absorbing compounds and carotenoids increased in response to the exposures with UVR. However, mechanisms for photoprotection associated with the increased carotenoids or UV-absorbing compounds were not adequate under the continuous exposure to a constant level of UV-B (0.09Wm−2, DNA-weighted). In contrast, under solar radiation screened off UV-B, the photoprotection was first accomplished by an initial increase of carotenoids and a later increase in UV-absorbing compounds. The overall response of this red tide alga to prolonged UV exposures indicates that S. costatum is a UV-B-sensitive species and increased UV-B irradiance would influence the formation of its blooms.
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