被子植物重要疑难类群的进化历史重建——以豆目的系统发育基因组学研究为例

被子植物重要疑难类群的系统关系和进化历史重建是植物分类学和被子植物进化研究领域的重大挑战之一。本项目以豆目植物为研究对象，利用最新的hyb-seq/浅层基因组测序技术同时获取线粒体基因组、质体基因组和核基因组序列，在片段分区方案选择、分子进化模型、碱基替换饱和性检测、直系同源基因筛选的基础上，利用最大似然法和贝叶斯法分别构建线粒体基因树、质体基因树和核基因树，对不同方法下获得的树形结构进行评估并构建基因树以及物种树，结合化石证据推算豆目早期起源和分化历史以及重要形态性状的演化模式。本研究有望为重建被子植物疑难类群的进化历史提供一个创新性的研究案例。

Resolving the recalcitrant groups in the angiosperm tree of life has long been an attractive challenge in plant taxonomy and plant evolutionary biology. Herein we studied the ecologically and economically important order Fabales using the cut-edge technology of hyb-seq or genome skimming to generate both mitochondria genomes, plastomes and nuclear genomes of Fabales to reconstruct gene trees and species trees. We propose here to test different tree construction methods for phylogenomics based on substitution saturation test, high confidence homologies identification, and partition scheme and modeling. Based on the molecular phylogeny and fossil records, we aim to reconstruct the early evolutionary history of Fabales and to reconstruct the evolution of key morphological characters.