Environmentally induced and (epi-)genetically based physiological trait differentiation between Heliosperma pusillum and its polytopically evolved ecologically divergent descendent, H.veselskyi (Caryophyllaceae: Sileneae)
Environmentally induced and (epi-)genetically based physiological trait differentiation between Heliosperma pusillum and its polytopically evolved ecologically divergent descendent, H.veselskyi (Caryophyllaceae: Sileneae)
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DOI：
10.1111/boj.12467
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发表时间：
2016-11-01
影响因子：
2.4
通讯作者：
Neuner, Gilbert
中科院分区：
文献类型：
--
作者：
Bertel, Clara;Buchner, Othmar;Neuner, Gilbert
进化是由自然选择驱动的，有利于个体在形态和生理上适应其生长地点的环境条件。在这里，我们研究了环境诱导和（epi）遗传为基础的组件的光合作用的分歧，在响应辐照度和温度和细胞特征，反映水的可用性在两个非单系，parapatric和interfertile，但形态和生态上强烈分歧的物种在其自然栖息地，并在一个共同的花园。Heliosperma pusillum出现在高山潮湿的岩石栖息地，而H.veselskyi仅限于山区阴凉的栖息地，在悬垂的岩石下面有干燥的土壤。自然生境的小气候差异在光合有效光子通量密度和叶温上表现明显。光合光响应与辐照气候的差异一致，表明不同的光合参数有利于在特定的生长地点。光合作用适应较低的日最低温度在高山网站，但在高温下没有什么不同。在公共花园中，两个物种都调整了它们的功能特性，以应对环境条件的变化。光合作用的不同光响应表明影响光合参数的基于（表观）遗传的组件。小刺山蚂蝗和小刺山蚂蝗的早期物种形成可能是环境诱导的，因为性状值和小气候条件之间的密切联系表明，功能分化是适应性的。这符合不同地区相似生态条件下相似表型的独立进化。
Evolution is driven by natural selection, favouring individuals adapted in morphology and physiology to the environmental conditions at their growing site. Here, we studied environmentally induced and (epi-)genetically based components of divergence of photosynthesis in response to irradiance and temperature and cellular characteristics reflecting water availability in two reciprocally non-monophyletic, parapatric and interfertile, but morphologically and ecologically strongly divergent species in their natural habitat and in a common garden. Heliosperma pusillum occurs in alpine wet rocky habitats, whereas H.veselskyi is restricted to montane shady habitats with dry soils below overhanging rocks. Microclimatic divergence of natural habitats was evident in photosynthetically active photon flux density and leaf temperature. Photosynthetic light response was in agreement with differences in irradiance climate, suggesting that different photosynthetic parameters are favoured at particular growing sites. Photosynthesis was adapted to lower daily minimum temperatures at the alpine site, but did not differ at high temperatures. In the common garden, both species adjusted their functional traits in response to the shift in environmental conditions. The different light response of photosynthesis suggests an (epi-)genetically based component affecting photosynthetic parameters. Early-stage speciation between H.pusillum and H.veselskyi is probably environmentally induced, as the close connection between trait values and microclimatic conditions suggests that functional differentiation is adaptive. This is in line with the independent evolution of similar phenotypes under similar ecological conditions in different regions.