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Phylogenetic Systematics of the Mesa Mints: Pogogyne (Lamiaceae)

机译：梅萨薄荷的系统发育系统学：Pogogyne（唇形科）

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摘要

Pogogyne (Lamiaceae) is a small genus of annual plants, occurring almost entirely in vernal pool habitats. To infer the phylogenetic relationships of this group, DNA sequence data from the trnQ-rps16 chloroplast spacer and both ETS and ITS nuclear regions were obtained from all seven extant species and several outgroups and analyzed using both parsimony and Bayesian phylogeny reconstruction methods. Ancestral state reconstructions were performed for morphological characters that have been used to separate groups within Pogogyne. This study indicates that subgenus Hedeomoides is monophyletic with good support and can be diagnosed by two apomorphies: a reduction in stamen number and a reduced corolla size. Subgenus Pogogyne is paraphyletic, but with poor support. Several clades within the genus Pogogyne have discrete biogeographic distributions. The Pogogyne genus clade has a relatively long stem lineage, but its crown clade has quite short branches. Our estimate for the mean divergence time of the stem node is 5.1-7.7 million years ago and for that of the crown node is 0.9-1.9 million years ago, the latter overlapping with ages of vernal pool ecosystems. These results support the hypothesis that the members of Pogogyne underwent a rapid diversification in response to specialization to a periodically inundated habitat.
机译：Pogogyne（唇形科）是一年生植物的一小类，几乎完全在春季池生境中发生。为了推断该类群的亲缘关系，从所有七个现存物种和几个外群中获得了来自trnQ-rps16叶绿体间隔区以及ETS和ITS核区的DNA序列数据，并使用简约和贝叶斯系统发育重建方法进行了分析。对形态学特征进行了祖先状态重建，这些形态学特征已用于分离Pogogyne中的组。这项研究表明，Heodeomoides亚属是单系的，并具有良好的支持，可以通过两种无性型来诊断：雄蕊数量减少和花冠大小减少。 Pogogyne亚属是共生的，但支持不佳。 Pogogyne属中的几个进化枝具有不连续的生物地理分布。 Pogogyne属进化枝具有相对较长的茎谱系，但其冠状进化枝具有相当短的分支。我们对茎节的平均发散时间的估计是5.1-770万年前，对冠状节的平均发散时间的估计是0.9-190万年前，后者与春季池生态系统的年龄重叠。这些结果支持了以下假设：Pogogyne的成员经历了快速的多样化，以应对周期性淹没的栖息地的专门化。

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