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首页> 外文期刊>Marine biology >Compensation of lack of UV screening by cellular tolerance in green macroalgae (Ulvophyceae) from the upper eulittoral
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Compensation of lack of UV screening by cellular tolerance in green macroalgae (Ulvophyceae) from the upper eulittoral

机译：通过上容区绿色大型藻类（Uulvophyceae）中的细胞耐受来补偿缺乏紫外线的情况

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摘要

Living side by side in the upper eulittoral of the Baltic different species of green macroalgae can be assumed to require similar resistance against solar ultraviolet-B radiation (UVB, 280-315 nm). Avoidance of UVB absorption by UV-screening pigments acts as a fundamental UVB resistance mechanism in the majority of phototrophs, including green macroalgae from the order Cladophorales. Contrastingly, other orders of green macroalgae, like the Ulvales, Ulotrichales, or Bryopsidales, lack UV screening. Field grown thalli of coexisting species representative for all four orders were exposed to experimental UVB radiation and photosystem II (PSII) and DNA damage and its repair were assessed. UV-screening Cladophora sp. showed only half as much UVB-induced damage in comparison with the non-screening species Acrosiphonia sp., Bryopsis hypnoides, and Ulva intestinalis. However, intrinsic UVB sensitivity of PSII and DNA was very similar in all species. We hypothesized that the non-screening species would compensate the lack of protection by increased repair rates. UVA-driven CPD removal was more than twice as fast in non-UV screening as in screening species. Recovery of PSII was very efficient in Acrosiphonia sp. and U. intestinalis but not in B. hypnoides or Cladophora sp.. We conclude that DNA and PSII repair are important cellular tolerance mechanisms which compensate for the lack of UV-screening compounds in the green macroalgae Acrosiphonia sp. and U. intestinalis. Bryopsis hypnoides turned out to be more sensitive than the other species and may avoid UVB damage by growing in greater depth.
机译：可以认为，在波罗的海的上岸并排生活，不同种类的绿色大型藻类需要对太阳紫外线-B辐射（UVB，280-315 nm）具有相似的抵抗力。紫外线屏蔽颜料可避免UVB吸收，这是大多数光养生物的基本抗UVB机理，包括Cladophorales订单中的绿色大型藻类。相反，其他的绿色大型藻类，如Ulvales，Ulotrichales或Bryopsidales，则没有进行紫外线屏蔽。代表所有四个订单的共存物种的田间生长thalli暴露于实验性UVB辐射和光系统II（PSII）中，并评估了DNA损伤及其修复。紫外线屏蔽Cladophora sp。与非筛选物种Acrosiphonia sp。，Bryopsis hypnoides和Ulva intestinalis相比，UVB诱导的伤害只显示一半。但是，PSII和DNA固有的UVB敏感性在所有物种中都非常相似。我们假设，非筛选物种将通过提高修复率来弥补缺乏保护的情况。 UVA驱动的CPD去除在非UV筛选中的速度是在筛选物种中的两倍以上。 PSII的恢复在Acrosiphonia sp。中非常有效。我们得出结论，DNA和PSII修复是重要的细胞耐受机制，可弥补绿色大型藻类Acrosiphonia sp。中缺少UV筛选化合物。和肠。催眠草比其他物种更敏感，可以通过更深的生长来避免对UVB的损害。

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    《Marine biology》 |2018年第8期|132.1-132.12|共12页
  • 作者

    Pescheck Frauke; Bilger Wolfgang;

  • 作者单位

    Christian Albrechts Univ Kiel, Bot Inst, Olshausenstr 40, D-24098 Kiel, Germany;

    Christian Albrechts Univ Kiel, Bot Inst, Olshausenstr 40, D-24098 Kiel, Germany;

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