Stiller John W
Department of Biology, Howell Science Complex, N108, East Carolina University, Greenville, NC 27858, USA.
Trends Plant Sci. 2007 Sep;12(9):391-6. doi: 10.1016/j.tplants.2007.08.002. Epub 2007 Aug 16.
Evolutionary relationships among complex, multicellular eukaryotes are generally interpreted within the framework of molecular sequence-based phylogenies that suggest green plants and animals are only distantly related on the eukaryotic tree. However, important anomalies have been reported in phylogenomic analyses, including several that relate specifically to green plant evolution. In addition, plants and animals share molecular, biochemical and genome-level features that suggest a relatively close relationship between the two groups. This article explores the impacts of plastid endosymbioses on nuclear genomes, how they can explain incongruent phylogenetic signals in molecular data sets and reconcile conflicts among different sources of comparative data. Specifically, I argue that the large influx of plastid DNA into plant and algal nuclear genomes has resulted in tree-building artifacts that obscure a relatively close evolutionary relationship between green plants and animals.
复杂多细胞真核生物之间的进化关系通常在基于分子序列的系统发育框架内进行解释，该框架表明绿色植物和动物在真核生物树上的关系较为疏远。然而，在系统发育基因组分析中已报道了一些重要的异常情况，其中包括一些与绿色植物进化特别相关的情况。此外，植物和动物共享分子、生化和基因组水平的特征，这表明这两组生物之间存在相对密切的关系。本文探讨了质体共生对核基因组的影响，以及它们如何解释分子数据集中不一致的系统发育信号，并调和不同比较数据源之间的冲突。具体而言，我认为质体DNA大量涌入植物和藻类的核基因组导致了构建系统发育树时的假象，从而掩盖了绿色植物和动物之间相对密切的进化关系。
