Morphological and genetic variations of Potentilla matsumurae (Rosaceae) between fellfield and snowbed populations.
Morphological and genetic variations of Potentilla matsumurae (Rosaceae) between fellfield and snowbed populations.
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DOI：
10.3732/ajb.0800242
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发表时间：
2009-04
影响因子：
3
通讯作者：
Yoshiko Shimono;Mikio Watanabe;A. Hirao;N. Wada;G. Kudo
中科院分区：
文献类型：
--
作者：
Yoshiko Shimono;Mikio Watanabe;A. Hirao;N. Wada;G. Kudo
识别与种群局部分化相关的生态因子对于理解微进化过程非常重要。高山环境提供了一个独特的机会，调查栖息地特定的选择力和基因流限制在微观上的人口对当地的适应，因为在高山生态系统的异质性融雪模式提供了陡峭的环境变化的影响。我们调查了在日本北方分布沿着融雪梯度分布的高山草本植物松村委陵菜（Potentilla matsumurae）的形态特征和酶位点的变化。我们发现在北方分布区的荒地和雪床栖息地之间的形态特征的显着差异。当植物在温室中的均匀条件下生长时，这些差异得以维持。来自不同历史背景的15个地理上分离的地区的等位酶变异表明，种群之间的遗传分化的fellfield和雪床的栖息地在一个区域内比种群之间占据相同的栖息地类型在不同地区。这些结果表明，在融雪制度的变化可能是一个驱动力，创造当地的适应和高山植物种群的遗传分化。
Identifying ecological factors associated with local differentiation of populations is important for understanding microevolutionary processes. Alpine environments offer a unique opportunity to investigate the effects of habitat-specific selective forces and gene flow limitations among populations at a microscale on local adaptation because the heterogeneous snowmelt patterns in alpine ecosystems provide steep environmental changes. We investigated the variation in morphological traits and enzyme loci between fellfield and snowbed populations of Potentilla matsumurae, a common alpine herb with a wide distribution along snowmelt gradients in northern Japan. We found significant differences in morphological traits between fellfield and snowbed habitats in a northern distribution region. These differences were maintained when plants were grown under uniform conditions in a greenhouse. Allozyme variations among 15 populations from geographically separated regions with different historical backgrounds showed that the populations are more genetically differentiated between the fellfield and snowbed habitats within a region than between populations occupying the same habitat type in different regions. These results suggest that variation in snowmelt regimes could be a driving force creating local adaptation and genetic differentiation of alpine plant populations.