Expanded phylogenetic and dating analyses of the apples and their relatives (Pyreae, Rosaceae)
Expanded phylogenetic and dating analyses of the apples and their relatives (Pyreae, Rosaceae)
复制标题
DOI：
10.1016/j.ympev.2011.10.005
复制
发表时间：
2012-05-01
影响因子：
4.1
通讯作者：
Donoghue, Michael J.
中科院分区：
文献类型：
--
作者：
Lo, Eugenia Y. Y.;Donoghue, Michael J.
尽管以前曾努力阐明菊科(蔷薇科)内部的关系，但主要亚谱系之间的关系、属的界限和分歧时间仍然不确定。本研究利用11个叶绿体区域和来自27个属331个种的486个个体的核糖体ITS序列，极大地扩展了黄腐亚科的系统发育分析。最大似然法和贝叶斯分析大体上支持现有的属界，尽管如先前所界定的那样，花椒属显然不是单系的。在叶绿体和它的系统发育之间发现了两个重要的冲突，这表明杂交在小蜂属和假性红细胞增多症的起源中起到了作用。此外，我们还提供了主要谱系的分歧时间的估计。我们的发现支持这样一种观点，即主要的Pyreae谱系是在始新世-渐新世建立的，但大多数现代多样性直到中新世才开始形成。至少检测到五次早期旧大陆-新大陆的重大分离，这些交替事件通常与通过Beringia的运动最一致。(C)2012 Elsevier Inc.保留所有权利。
Despite previous efforts to elucidate relationships within the Pyreae (Rosaceae), relationships among the major sub-lineages, generic limits, and divergence times have remained uncertain. The present study greatly expands phylogenetic analyses of the Pyreae by using a combination of 11 chloroplast regions plus nuclear ribosomal ITS sequences from 486 individuals representing 331 species and 27 genera. Maximum likelihood and Bayesian analyses generally support existing generic boundary, although Sorbus, as previously circumscribed, is clearly non-monophyletic. Two significant conflicts were detected between the chloroplast and ITS phylogenies, suggesting that hybridization played a role in the origins of Micromeles and Pseudocydonia. In addition, we provide estimates of the divergence times of the major lineages. Our findings support the view that the major Pyreae lineages were established during the Eocene-Oligocene period, but that most of the modern diversity did not originate until the Miocene. At least five major, early Old World-New World disjunctions were detected and these vicariance events are generally most consistent with movement through the Beringia. (C) 2012 Elsevier Inc. All rights reserved.