Evolution at the tips: Asclepias phylogenomics and new perspectives on leaf surfaces
Evolution at the tips: Asclepias phylogenomics and new perspectives on leaf surfaces
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DOI：
10.1002/ajb2.1062
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发表时间：
2018-03-01
影响因子：
3
通讯作者：
Liston, Aaron
中科院分区：
文献类型：
--
作者：
Fishbein, Mark;Straub, Shannon C. K.;Liston, Aaron
研究前提：叶表面性状，如毛状体密度和蜡的生产，调解重要的生态过程，如抗草食性防御和水分利用效率。我们提出了一个系统发育分析的马利筋的塑性体作为一个框架，用于分析毛状体密度和存在epicuticular waxes.METHODS的演变：我们产生了最大似然性的103种马利筋的塑性体的同源性。我们重建祖先的状态，并使用模型比较的可能性框架来分析字符进化Asclepias.Key结果：我们解决了骨干Asclepias.Key结果，把索诺兰沙漠分支和Incarnatae分支作为连续的姐妹篇，其余的物种。我们提出了新的发现有关叶表面进化的Asclepias的祖先是重建为无蜡和稀疏的毛，支持macroevolutionary最佳毛状体密度，毛状体密度的进化速度加快。结论：增加采样和选择最佳拟合模型的进化提供了更解决和强大的估计比在以前的研究中获得的发育和性格的进化。进化推理对字符编码比模型选择更敏感。
PREMISE OF THE STUDY: Leaf surface traits, such as trichome density and wax production, mediate important ecological processes such as anti-herbivory defense and water-use efficiency. We present a phylogenetic analysis of Asclepias plastomes as a framework for analyzing the evolution of trichome density and presence of epicuticular waxes.METHODS: We produced a maximum-likelihood phylogeny using plastomes of 103 species of Asclepias. We reconstructed ancestral states and used model comparisons in a likelihood framework to analyze character evolution across Asclepias.KEY RESULTS: We resolved the backbone of Asclepias, placing the Sonoran Desert clade and Incarnatae clade as successive sisters to the remaining species. We present novel findings about leaf surface evolution of Asclepias-the ancestor is reconstructed as waxless and sparsely hairy, a macroevolutionary optimal trichome density is supported, and the rate of evolution of trichome density has accelerated.CONCLUSIONS: Increased sampling and selection of best-fitting models of evolution provide more resolved and robust estimates of phylogeny and character evolution than obtained in previous studies. Evolutionary inferences are more sensitive to character coding than model selection.