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首页> 外文期刊>Marine biology >Effects of increased seawater temperature on UV tolerance of Antarctic marine macroalgae
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Effects of increased seawater temperature on UV tolerance of Antarctic marine macroalgae

机译：海水温度升高对南极海洋大型藻类紫外线耐受性的影响

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摘要

Cold-adapted Antarctic marine macroalgae have different physiological strategies to tolerate the ultraviolet (UV) radiation at low seawater temperatures around 0 A degrees C. The warming of Antarctica's coasts driven by global climate change may alter the physiology such to influence their UV tolerance. This study examined the interactive effects of different seawater temperatures (2 vs. 7 A degrees C) and UV radiation on the physiological performance (primary photochemistry: F (v)/F (m), soluble and insoluble phlorotannins, radical scavenging capacity) of seven macroalgae, which are dominant in Antarctic coastal ecosystems. Four brown and three red macroalgae, collected from Fildes Bay (King George Island, South Shetland Islands) in January/February, were exposed to 6 h of UV/temperature stress, followed by a 16-h recovery. The brown macroalgae Desmarestia menziesii and Ascoseira mirabilis showed the highest UV tolerance at 2 A degrees C, followed by Desmarestia anceps, and the rhodophytes Iridaea cordata, Trematocarpus antarcticus, and Palmaria decipiens. Himantothallus grandifolius (Phaeophyceae) was sensitive to UV radiation at 2 A degrees C. At 7 A degrees C, UV tolerance was improved in UV-sensitive macroalgae probably due to a more efficient damage repair of the photosynthetic apparatus. Temperature, however, did not modulate UV tolerance in D. anceps, indicating an UV-sensitive repair process. Constitutively, high contents of soluble and insoluble phlorotannins and radical scavenging capacities remained unchanged in endemic Desmarestiales. UV induction of soluble phlorotannins along with an increased radical scavenging capacity can be responsible for A. mirabilis' high UV tolerance. This study suggests that UV tolerance in macroalgae, which are sensitive to UV radiation at 2 A degrees C, is modulated by temperature. Enhanced UV tolerance at 7 A degrees C can be apparently ascribed to the stimulation of damage repair of the photosynthetic apparatus rather than to an enhanced UV screening or radical scavenging.
机译：冷适应的南极海洋大型藻类具有不同的生理策略，可以耐受0 A左右的低海水温度下的紫外线（UV）辐射。受全球气候变化驱动的南极海岸变暖可能会改变生理机制，从而影响其耐紫外线性。这项研究检验了不同海水温度（2 vs. 7 A摄氏度）和紫外线辐射对鱼的生理性能（主要光化学：F（v）/ F（m），可溶和不可溶的邻苯二酚，自由基清除能力）的相互作用。七个大型藻类，在南极沿海生态系统中占主导地位。 1月/ 2月从菲尔德斯湾（南设得兰群岛的乔治岛）采集的四个棕色和三个红色大型藻类暴露于紫外线/温度胁迫6小时，然后恢复16小时。棕色大型藻类Desmarestia menziesii和Ascoseira mirabilis在2 A摄氏度下表现出最高的UV耐受性，其次是Desmarestia anceps，红藻类鸢尾科，南极拟南芥（Trematocarpus antarcticus）和Palmaria decipiens。大果喜马拉雅花（菊科）对2 A的紫外线辐射敏感。在7 A的温度下，对紫外线敏感的大型藻类的紫外线耐受性得到了改善，这可能是由于光合装置的损伤修复效率更高。然而，温度并不能调节D. anceps的紫外线耐受性，表明紫外线敏感的修复过程。从组成上讲，地方性海藻中的可溶性和不溶性邻苯二酚含量高，清除自由基的能力保持不变。紫外线诱导的可溶性邻苯二酚具有更高的自由基清除能力，这可能是奇异曲霉具有很高的紫外线耐受性的原因。这项研究表明，对温度在2 A时对紫外线辐射敏感的大型藻类，其紫外线耐受性受温度调节。明显地，在7 A摄氏度下增强的UV耐受性可以归因于光合作用设备损伤修复的刺激，而不是增强的UV屏蔽或自由基清除。

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  • 来源
    《Marine biology》 |2015年第5期|1087-1097|共11页
  • 作者

    Rautenberger Ralf; Huovinen Pirjo; Gomez Ivan;

  • 作者单位

    Univ Austral Chile, Inst Ciencias Marinas & Limnol, Valdivia, Chile;

    Univ Austral Chile, Inst Ciencias Marinas & Limnol, Valdivia, Chile;

    Univ Austral Chile, Inst Ciencias Marinas & Limnol, Valdivia, Chile;

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