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首页> 外文学位 >The molecular systematics and evolution of Euphorbiaceae sensu lato.
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The molecular systematics and evolution of Euphorbiaceae sensu lato.

机译：大戟科的分子系统学和进化。

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摘要

Euphorbiaceae sensu lato, a large, diverse and economically important family of flowering plants, are here subject to molecular phylogenetic analyses using DNA sequences from six loci. Analyses of plastid rbcL and atpB, along with nuclear small subunit (18 S) sequence data from 80 exemplars of the rosid order Malpighiales, reveal a polyphyletic Euphorbiaceae s. l. and support the recognition of six monophyletic lineages (Euphorbiaceae sensu stricto, Pandaceae, Paradrypetes, Phyllanthaceae, Picrodendraceae, and Putranjivaceae). Relationships of these lineages with the 28 other Malpighiales families are poorly resolved with the exception of a supported sister group relationship between Paradrypetes and the red mangroves (Rhizophoraceae). Further sampling within specific Euphorbiaceae s.l. clades using rbcL (180 taxa), trnL-F region (140 taxa), or ITS (25 taxa) examined finer scale relationships proposed by Webster (1994). Although tribal relationships largely agree with those of Webster, the subfamilies of Euphorbiaceae s.s. must be recircumscribed.;Mitochondrial intron evolution of Malpighiales was also investigated. A nad1-bc intron phylogeny for 60 taxa of Malpighiales is poorly resolved. A proiscuous homing group I intron in cox1 was found to be present in at least 15 families in the order. Putative co-conversion tract differences in the 3' exon adjacent to the site of insertion suggest there are additional cryptic horizontal gains within intron-containing clades. Euphorbiaceae s.s. were identified as the largest known cox1 intron-saturated clade of angiosperms, and incongruence between intron and organismal phylogenies suggests complex patterns of horizontal and vertical transmission and sporadic intron-encoded endonuclease degeneration. Co-conversion evidence is complicated by RNA editing sites and intron-containing taxa that appear to lack co-conversion tracts. The cox1 introns in one clade of Euphorbia (Euphorbiaceae s.s.) contained a 2.1 kb insertion from a portion of the plastid inverted repeat. Phylogenetic analysis of plastid and mitochondrial copies is consistent with one inter-organelle transposition event followed by vertical transmission of this resident insertion with the cox1 intron.
机译：大戟科（Euphorbiaceae sensu lato）是一个庞大，多样且在经济上重要的开花植物科，在这里使用来自六个基因座的DNA序列进行分子系统发育分析。质体rbcL和atpB的分析，以及来自80个红锈病菌Malpighiales的核小亚基（18 S）序列数据，揭示了多系大戟科。 l。并支持对六种单系谱系的识别（严格的Euphorbiaceae sensu，Pandaceae，Paradrypetes，Phyllanthaceae，Picrodendraceae和Putranjivaceae）。这些谱系与其他28个Malpighiales家族的关系解决得很差，除了Paradrypetes和红树林（Rhizophoraceae）之间受支持的姐妹群体关系。在特定的大戟科中进一步取样。使用rbcL（180个分类单元），trnL-F区（140个分类单元）或ITS（25个分类单元）的进化枝检查了Webster（1994）提出的更精细的比例关系。尽管部落关系在很大程度上与韦伯斯特的关系一致，但大戟科的亚科。必须重新划定。；还研究了马鞭草的线粒体内含子进化。一个Nad1-bc内含子系统发育的60个分类科的Malpighiales。发现该顺序中至少有15个家庭中存在cox1的近亲归巢I类内含子。邻近插入位点的3'外显子的假定的共转化谱差异表明，在含内含子的进化枝中还有隐秘的水平增益。大戟科被认为是被子植物中最大的已知cox1内含子饱和进化枝，内含子和有机体系统发育之间的不一致说明水平和垂直传播以及散发的内含子编码的核酸内切酶变性的复杂模式。 RNA转换位点和含内含子的类群似乎缺乏协同转化区，使得协同转化证据变得复杂。大戟属（Euphorbiaceae s.s.）的一个进化枝中的cox1内含子包含从质体反向重复序列的一部分插入的2.1 kb插入片段。质体和线粒体复制的系统发生分析与一个细胞间转座事件相一致，随后该居留插入物与cox1内含子垂直传递。

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  • 作者

    Wurdack, Kenneth John.;

  • 作者单位

    The University of North Carolina at Chapel Hill.;

  • 授予单位 The University of North Carolina at Chapel Hill.;
  • 学科 Botany.;Genetics.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 157 p.
  • 总页数 157
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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