Phylogeographic breaks within Asian butternuts indicate the existence of a phytogeographic divide in East Asia
Phylogeographic breaks within Asian butternuts indicate the existence of a phytogeographic divide in East Asia
复制标题
亚洲白胡桃的系统发育地理断裂表明东亚存在植物地理鸿沟
DOI：
10.1111/nph.13711
复制
发表时间：
2016-03-01
期刊：
影响因子：
9.4
通讯作者：
Zhang, Da-Yong
中科院分区：
文献类型：
--
作者：
Bai, Wei-Ning;Wang, Wen-Ting;Zhang, Da-Yong
东亚被假设为分为两个不同的北方和南方地区，被一条在第三纪早期更为严重但至今仍然存在的干燥气候带隔开。然而，这一地理学假说很少用分子生物地理学方法进行检验。（胡桃组）的遗传数据一致地确定了两个分支，一个是北方分支，另一个是中国胡桃分支。包括胡桃楸（Juglans mandshurica）和胡桃楸（Juglans ailantifolia），以及一种南方的，包括胡桃楸（Juglans cathayensis）。这两个分支分歧，通过气候引起的vicariance的祖先北方范围在中新世中期，并保持大部分独立之后，与地理隔离的日本群岛和避难所隔离或二次接触，在更新世晚期产生进一步细分内的北方分支。但除此之外，我们还发现了环境适应在维持和/或加强南北差异方面的作用。亚洲胡桃为新近纪和更新世期间东亚北方和南方之间存在地理分界提供了强有力的证据。
East Asia has been hypothesized to be subdivided into two distinct northern and southern areas, separated by a band of dry climate that was far more severe in the early Tertiary but still exists today. However, this biogeographic hypothesis has rarely been tested using a molecular phylogeographic approach.We genotyped 70 populations throughout the distributional range of Asian butternuts (Juglans section Cardiocaryon) using eight chloroplast DNA regions, one single-copy nuclear gene, and 17 nuclear microsatellite loci, supplemented with paleodistribution modeling of the major genetic clades.The genetic data consistently identified two clades, one northern, comprising Juglans mandshurica and Juglans ailantifolia, and one southern, comprising Juglans cathayensis. The two clades diverged through climate-induced vicariance of an ancestral northern range during the mid-Miocene and remained mostly separate thereafter, with geographical isolation of the Japanese Islands and refugial isolation or secondary contacts in the late Pleistocene producing further subdivision within the northern clade. But beyond all that, we also discovered a role of environmental adaptation in maintaining and/or reinforcing the north-south divergence.Asian butternuts offer a strong case for the existence of a biogeographic divide between the northern and southern parts of East Asia during the Neogene and into the Pleistocene.