Chlorophyll a fluorescence responses of temperate Phaeophyceae under submersion and emersion regimes: a comparison of rapid and steady-state light curves
Chlorophyll a fluorescence responses of temperate Phaeophyceae under submersion and emersion regimes: a comparison of rapid and steady-state light curves
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DOI：
10.1007/s11120-012-9776-z
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发表时间：
2012-08
影响因子：
3.7
通讯作者：
U. Nitschke;S. Connan;D. B. Stengel
中科院分区：
文献类型：
--
作者：
U. Nitschke;S. Connan;D. B. Stengel
藻类适应环境胁迫的潜力通常使用叶绿素荧光进行评估，其中光合作用与辐照度（P/E）曲线的参数变化测量为快速光曲线（RLC）或稳态光曲线（LC）。本文采用RLC和LC两种方法，比较了出水对四种大型褐藻（瘤叶藻、墨角藻、海藻和海带）初级光合作用的影响。当使用LC时，在A. nodosumandF.锯齿状突起表现为qP、rETRmax和Ek的增加。与此相反，出苗对S.穆蒂库曼湖毛地黄在A组，NPQ-rETR关系的相对变化降低。nodosum、F. serratusandS.而L.毛地黄由于没有一种物质产生其潜在的NPQmax，因此无法从RLC确定相应的值。利用RLC技术，观察了F.锯叶藓属足趾在露出时减少，而NPQ max值增加。只有来自LC的结果提供证据的潜在的生理适应褐藻的自然栖息地，建议使用LC协议来检测环境对光合作用的影响。
The potential of algae to acclimate to environmental stress is commonly assessed using chlorophyllafluorescence, with changes in parameters of photosynthesis versus irradiance (P/E) curves measured either as rapid light curves (RLC) or steady-state light curves (LC). Here, effects of emersion on primary photosynthesis of four brown macroalgae (Ascophyllum nodosum,Fucus serratus,Sargassum muticum,Laminaria digitata) were compared by applying both RLC and LC. When LC were used, photosynthetic performance was enhanced during emersion inA. nodosumandF. serratusas shown by increases in qP, rETRmaxandEk. By contrast, emersion had no impact on photosynthetic parameters ofS. muticumandL. digitata. Relative changes in the NPQ–rETR relationship were reduced inA. nodosum,F. serratusandS. muticum, but remained unaffected inL. digitata. As none of the species developed their potential NPQmax, corresponding values could not be determined from RLC. Using RLC, observed photosynthetic performance ofF. serratusandL. digitatawas reduced upon emersion, whilst values for NPQmaxwere enhanced. Only results derived from LC provide evidence for a potential physiological adaptation of brown macroalgae to their natural habitat; it is recommended using the LC protocol to detect environmental impacts on photosynthesis.