Genotypic and environmental variation in specific leaf area in a widespread Alpine plant after transplantation to different altitudes
Genotypic and environmental variation in specific leaf area in a widespread Alpine plant after transplantation to different altitudes
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DOI：
10.1007/s00442-010-1650-0
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发表时间：
2010-09-01
期刊：
影响因子：
2.7
通讯作者：
Stoecklin, Juerg
中科院分区：
文献类型：
--
作者：
Scheepens, J. F.;Frei, Eva S.;Stoecklin, Juerg
比叶面积（SLA）是重要的植物功能性状，因为它是相对生长速率、胁迫耐受性和叶片寿命等生态生理特征的指标。 SLA 的显着种内变异很常见，并且通常与环境条件相关。例如，SLA 随着海拔的增加而降低，这被理解为对温度的调整。一般认为，种内变异主要是环境引起的表型可塑性的结果，但由于局部适应或遗传漂变，也可能存在遗传效应。在这项研究中，通过将植物移植到海拔不同（海拔 600、1,235 和 1,850 米）的三个常见花园中，对广泛分布的高山铃花风铃草 SLA 的基因型和环境影响进行了实验分离。种子采样自欧洲阿尔卑斯山四个系统发育地理区域的 18 个种群。观察到强烈的塑料反应：SLA 随着普通花园海拔的增加而降低（变化的 22.0%）。常见花园中 SLA 的系统发育地理区域存在差异（变异为 10.1%），表明 SLA 至少部分是由遗传决定的。最东部六个种群的植物经历了亚地中海气候，与西部种群相比，三个常见花园中的 SLA 值降低，这可能是为了适应干旱。在这些地中海以南地区的种群中，三分之二的常见花园中的 SLA 随着原产地海拔高度的增加而降低。总之，SLA 显示出很强的表型可塑性以及显着的遗传效应，后者可能是适应当地条件而不是遗传漂变的结果。
Specific leaf area (SLA) is an important plant functional trait as it is an indicator of ecophysiological characteristics like relative growth rate, stress tolerance and leaf longevity. Substantial intraspecific variation in SLA is common and usually correlates with environmental conditions. For instance, SLA decreases with increasing altitude, which is understood as adjustment to temperature. It is generally assumed that intraspecific variation is mostly the result of environmentally induced phenotypic plasticity, but genetic effects may also be present, due to local adaptation or genetic drift. In this study, genotypic and environmental effects on SLA were experimentally separated for the widespread Alpine bell flower Campanula thyrsoides by transplanting plants to three common gardens at contrasting altitudes (600, 1,235 and 1,850 m a.s.l.). Seeds were sampled from 18 populations in four phylogeographic regions within the European Alps. A strong plastic response was observed: SLA decreased with increasing altitude of the common gardens (22.0% of variation). The phylogeographic regions were differentiated in SLA in the common gardens (10.1% of variation), indicating that SLA is at least partly genetically determined. Plants from the six easternmost populations experienced a submediterranean climate and showed decreased SLA values in the three common gardens compared to populations to the west, which may be explained as adaptation to drought. Within these submediterranean populations, SLA decreased with altitude of origin in two out of three common gardens. Concluding, SLA shows strong phenotypic plasticity as well as substantial genetic effects, the latter probably being the result of adaptation to local conditions rather than genetic drift.