Ecophysiology and genetic structure of polar versus temperate populations of the lichen Cetraria aculeata
Ecophysiology and genetic structure of polar versus temperate populations of the lichen Cetraria aculeata
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DOI：
10.1007/s00442-013-2670-3
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发表时间：
2013-11-01
期刊：
影响因子：
2.7
通讯作者：
Printzen, C.
中科院分区：
文献类型：
--
作者：
Domaschke, S.;Vivas, M.;Printzen, C.
为了探讨光生物的遗传差异是否与全生地衣的生理特性有关，我们对极地和温带天竺葵地衣进行了研究。研究了不同温度（0 ~ 30℃）和光子通量密度(0 ~ 1200 μ mol m（-2) s(-1)）条件下4个种群的净光合作用和暗呼吸（DR）。样本来自南极海域、斯瓦尔巴群岛、德国和西班牙，代表了不同的气候情况。光生物的测序表明，所研究的样品属于Fernandez-Mendoza et al. （Mol Ecol 20:20 08-1232, 2011）所描述的极地和温带分支。地衣的光合作用温度、最大净光合作用、最大DR和叶绿素含量不同。南极和斯瓦尔巴群岛的最大净光合作用远低于德国和西班牙。以叶绿素含量表示速率时，差异较小。极地地衣（11℃）和温带地衣（15℃和17℃）的最佳温度也是如此。我们的研究结果表明，地衣分枝体可能通过从区域池中选择藻类或通过调节菌体内的藻类细胞数量（叶绿素含量）来适应或适应当地的环境条件。
We studied polar and temperate samples of the lichen Cetraria aculeata to investigate whether genetical differences between photobionts are correlated with physiological properties of the lichen holobiont. Net photosynthesis and dark respiration (DR) at different temperatures (from 0 to 30 A degrees C) and photon flux densities (from 0 to 1,200 mu mol m(-2) s(-1)) were studied for four populations of Cetraria aculeata. Samples were collected from maritime Antarctica, Svalbard, Germany and Spain, representing different climatic situations. Sequencing of the photobiont showed that the investigated samples fall in the polar and temperate clade described in Fernandez-Mendoza et al. (Mol Ecol 20:1208-1232, 2011). Lichens with photobionts from these clades differ in their temperature optimum for photosynthesis, maximal net photosynthesis, maximal DR and chlorophyll content. Maximal net photosynthesis was much lower in Antarctica and Svalbard than in Germany and Spain. The difference was smaller when rates were expressed by chlorophyll content. The same is true for the temperature optima of polar (11 A degrees C) and temperate (15 and 17 A degrees C) lichens. Our results indicate that lichen mycobionts may adapt or acclimate to local environmental conditions either by selecting algae from regional pools or by regulating algal cell numbers (chlorophyll content) within the thallus.