Phylogenomics resolves the deep phylogeny of seed plants and indicates partial convergent or homoplastic evolution between Gnetales and angiosperms
Phylogenomics resolves the deep phylogeny of seed plants and indicates partial convergent or homoplastic evolution between Gnetales and angiosperms
复制标题
系统发育学解决了种子植物的深层系统发育，并表明买麻藤目和被子植物之间的部分趋同或同质进化
DOI：
10.1098/rspb.2018.1012
复制
发表时间：
2018-06-27
影响因子：
4.7
通讯作者：
Wang, Xiao-Quan
中科院分区：
文献类型：
--
作者：
Ran, Jin-Hua;Shen, Ting-Ting;Wang, Xiao-Quan
经过几十年的分子系统学研究，裸子植物的深层系统发育问题仍未得到解决，买麻藤目的系统位置仍然是种子植物进化中最具争议的问题之一。为了解决种子植物的深层系统发育和解决系统发育冲突的来源，我们进行了一个转录组学研究的所有13个科的裸子植物和被子植物的主要谱系。多个数据集包含多达1296042个网站在1308个位点进行了分析，使用连接和合并的方法。我们的研究产生了一个一致的和良好的解决种子植物，这地方买麻藤作为姐妹松科，从而支持买麻藤假说。苏铁加银杏是姐妹其余裸子植物。我们还发现买麻藤目植物和被子植物具有相似的分子进化速率，远高于其他裸子植物。这意味着买麻藤目和被子植物在进化史上可能经历过类似的选择压力。趋同的分子进化或同源性是种子植物系统发育冲突的部分原因。我们的研究提供了一个强大的重建骨干系统发育，是重要的种子植物，特别是裸子植物，在未来的分子和形态学研究的进化。
After decades of molecular phylogenetic studies, the deep phylogeny of gymnosperms has not been resolved, and the phylogenetic placement of Gnetales remains one of the most controversial issues in seed plant evolution. To resolve the deep phylogeny of seed plants and to address the sources of phylogenetic conflict, we conducted a phylotranscriptomic study with a sampling of all 13 families of gymnosperms and main lineages of angiosperms. Multiple datasets containing up to 1 296 042 sites across 1308 loci were analysed, using concatenation and coalescence approaches. Our study generated a consistent and well-resolved phylogeny of seed plants, which places Gnetales as sister to Pinaceae and thus supports the Gnepine hypothesis. Cycads plus Ginkgo is sister to the remaining gymnosperms. We also found that Gnetales and angiosperms have similar molecular evolutionary rates, which are much higher than those of other gymnosperms. This implies that Gnetales and angiosperms might have experienced similar selective pressures in evolutionary histories. Convergent molecular evolution or homoplasy is partially responsible for the phylogenetic conflicts in seed plants. Our study provides a robustly reconstructed backbone phylogeny that is important for future molecular and morphological studies of seed plants, in particular gymnosperms, in the light of evolution.