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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Analysis of 81 genes from 64 plastid genomes resolves relationships in angiosperms and identifies genome-scale evolutionary patterns
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Analysis of 81 genes from 64 plastid genomes resolves relationships in angiosperms and identifies genome-scale evolutionary patterns

机译：分析来自64个质体基因组的81个基因可解决被子植物中的关系并鉴定基因组规模的进化模式

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摘要

Angiosperms are the largest and most successful clade of land plants with >250,000 species distributed in nearly every terrestrial habitat. Many phylogenetic studies have been based on DNA sequences of one to several genes, but, despite decades of intensive efforts, relationships among early diverging lineages and several of the major clades remain either incompletely resolved or weakly supported. We performed phylogenetic analyses of 81 plastid genes in 64 sequenced genomes, including 13 new genomes, to estimate relationships among the major angiosperm clades, and the resulting trees are used to examine the evolution of gene and intron content. Phylogenetic trees from multiple methods, including model-based approaches, provide strong support for the position of Amborella as the earliest diverging lineage of flowering plants, followed by Nymphaeales and Austrobailey-ales. The plastid genome trees also provide strong support for a sister relationship between eudicots and monocots, and this group is sister to a clade that includes Chloranthales and magnoliids. Resolution of relationships among the major clades of angiosperms provides the necessary framework for addressing numerous evolutionary questions regarding the rapid diversification of angiosperms. Gene and intron content are highly conserved among the early diverging angiosperms and basal eudicots, but 62 independent gene and intron losses are limited to the more derived monocot and eudicot clades. Moreover, a lineage-specific correlation was detected between rates of nucleotide substitutions, indels, and genomic rearrangements.
机译：被子植物是陆地植物中最大，最成功的分支，几乎在每个陆地生境中分布着超过250,000种。许多系统发育研究都基于一个到几个基因的DNA序列，但是，尽管经过数十年的艰苦努力，早期分歧谱系与几个主要进化枝之间的关系仍未得到完全解决或得到了较弱的支持。我们对64个测序的基因组中的81个质体基因（包括13个新基因组）进行了系统发育分析，以估计主要被子植物进化枝之间的关系，并将所得的树用于检查基因和内含子含量的演变。来自多种方法的系统发生树，包括基于模型的方法，为Amborella作为开花植物最早分化谱系的地位提供了有力支持，其次是Nymphaeales和Austrobailey-ales。质体基因组树也为双子叶植物和双子叶植物之间的姐妹关系提供了有力的支持，并且该群体是包括绿藻和木兰属的进化枝的姐妹。解决被子植物主要进化枝之间的关系为解决有关被子植物快速多样化的众多进化问题提供了必要的框架。在早期分化的被子植物和基底双子叶植物中，基因和内含子的含量高度保守，但是62个独立的基因和内含子的损失仅限于衍生得更多的单子叶植物和双子叶植物进化枝。此外，在核苷酸取代率，插入缺失和基因组重排之间检测到谱系特异性相关性。

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