文献类型：期刊文献

英文题名：Resolving the Speciation Patterns and Evolutionary History of the Intercontinental Disjunct Genus Corylus (Betulaceae) Using Genome-Wide SNPs

作者：Yang, Zhen[1] Zhao, Tian-Tian[1] Ma, Qing-Hua[1] Liang, Li-Song[1] Wang, Gui-Xi[1]

第一作者：杨振

通信作者：Zhao, TT[1];Wang, GX[1]

机构：[1]Chinese Acad Forestry, Key Lab Tree Breeding & Cultivat, State Forestry & Grassland Adm, Res Inst Forestry, Beijing, Peoples R China

年份：2018

卷号：9

外文期刊名：FRONTIERS IN PLANT SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000448238200001)】；

基金：This study was supported by the National Natural Science Foundation of China (Grant No. 31500555), and the Special Fund for Basic Scientific Research Business of Central Public Research Institutes (Grant Nos. CAFYBB2016QB003 and CAFYBB2017ZA004-9).

语种：英文

外文关键词：Corylus; speciation; recombination; hybridization; divergence time estimation; ancestral area reconstruction; genome-wide SNPs

摘要：Understanding the underlying mechanisms of species origin, divergence, and distribution patterns of the intercontinental disjunct taxa has long fascinated botanists. Based on 4,894 genome-wide single-nucleotide polymorphism dataset, we present a molecular phylogenetic reconstruction of genus Corylus (Betulaceae), which have a disjunct distribution between Eurasia and North America (NA). The aim is to explore the speciation patterns and evolutionary relationships of Corylus species by establishing a general phylogenetic framework with extensive sampling. Both the molecular phylogeny inferred from recombination-free dataset and structure analysis support the division of Corylus into four major clades (A-D). Recombination tests and hybridization detection reveal extensive recombination and hybridization events among different clades, which have potentially influenced the speciation process of Corylus. Divergence time estimation indicates that recent common ancestor (MRCA) of Corylus occurred in late Eocene (similar to 36.38 Ma) and subsequent rapid diversification began during Miocene. Ancestral area reconstruction shows that Corylus originated from southwest China. The arrival of two clades (Clades B and C) to NA was well supported by the long distance dispersal crossing the Bering land bridge. The Himalayas, European-Mediterranean area, and other distribution regions are primarily the recipients of dispersal taxa. Vicariance after dispersal plays an important role in speciation.