• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>other >Chloroplast variation is incongruent with classification of the Australian bloodwood eucalypts (genus Corymbia family Myrtaceae)
【2h】

Chloroplast variation is incongruent with classification of the Australian bloodwood eucalypts (genus Corymbia family Myrtaceae)

机译：叶绿体的变化与澳大利亚血木桉树（Corymbia属桃金娘科）的分类不一致

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Previous molecular phylogenetic analyses have resolved the Australian bloodwood eucalypt genus Corymbia (~100 species) as either monophyletic or paraphyletic with respect to Angophora (9–10 species). Here we assess relationships of Corymbia and Angophora using a large dataset of chloroplast DNA sequences (121,016 base pairs; from 90 accessions representing 55 Corymbia and 8 Angophora species, plus 33 accessions of related genera), skimmed from high throughput sequencing of genomic DNA, and compare results with new analyses of nuclear ITS sequences (119 accessions) from previous studies. Maximum likelihood and maximum parsimony analyses of cpDNA resolve well supported trees with most nodes having >95% bootstrap support. These trees strongly reject monophyly of Corymbia, its two subgenera (Corymbia and Blakella), most taxonomic sections (Abbreviatae, Maculatae, Naviculares, Septentrionales), and several species. ITS trees weakly indicate paraphyly of Corymbia (bootstrap support <50% for maximum likelihood, and 71% for parsimony), but are highly incongruent with the cpDNA analyses, in that they support monophyly of both subgenera and some taxonomic sections of Corymbia. The striking incongruence between cpDNA trees and both morphological taxonomy and ITS trees is attributed largely to chloroplast introgression between taxa, because of geographic sharing of chloroplast clades across taxonomic groups. Such introgression has been widely inferred in studies of the related genus Eucalyptus. This is the first report of its likely prevalence in Corymbia and Angophora, but this is consistent with previous morphological inferences of hybridisation between species. Our findings (based on continent-wide sampling) highlight a need for more focussed studies to assess the extent of hybridisation and introgression in the evolutionary history of these genera, and that critical testing of the classification of Corymbia and Angophora requires additional sequence data from nuclear genomes.
机译：以前的分子系统发育分析已将澳大利亚阔叶桉树桉属（Corymbia）（约100种）解析为与Angophora（9–10种）相比为单系或近缘。在这里，我们使用大量叶绿体DNA序列数据集（121,016个碱基对；代表55个Corymbia和8个按物种种的90个种，加上相关属的33个种），评估了Corymbia和Angophora的关系，并从基因组DNA的高通量测序中剔除了将结果与以前研究中对ITS序列的新分析（119个登录）进行比较。 cpDNA的最大似然和最大简约分析可解析得到良好支持的树，其中大多数节点具有> 95％的引导程序支持。这些树木强烈排斥科林比亚，其两个亚属（科林比亚和布拉克拉），大多数分类学部分（Abbreviatae，Maculatae，Naviculares，Septentrionales）的单系。 ITS树微弱地表明了Corymbia的属植物（自举支持率<50％，最大似然性，简约性支持率71％），但是与cpDNA分析高度不一致，因为它们支持单属属和Corymbia的某些分类学部分。 cpDNA树与形态分类学和ITS树之间惊人的不一致之处，主要是由于分类组之间叶绿体进化枝在地理上的共享，从而导致分类群之间的叶绿体渗入。在有关桉属的研究中已广泛推断出这种渗入。这是关于其可能在 Corymbia 和 Angophora 中盛行的第一份报道，但这与以前物种间杂交的形态学推断是一致的。我们的发现（基于全洲范围的采样）强调了需要进行更侧重的研究，以评估这些属的进化史中杂交和渗入的程度，以及对 Corymbia 和 Angophora 需要来自核基因组的其他序列数据。

著录项

相似文献

  • 外文文献
  • 中文文献
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号