Reticulate evolution and phylogeography in Asarum sect.: Asiasarum (Aristolochiaceae) documented in internal transcribed spacer sequences (ITS) of nuclear ribosomal DNA
Reticulate evolution and phylogeography in Asarum sect.: Asiasarum (Aristolochiaceae) documented in internal transcribed spacer sequences (ITS) of nuclear ribosomal DNA
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DOI：
10.1016/j.ympev.2007.01.011
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发表时间：
2007-08-01
影响因子：
4.1
通讯作者：
Maki, Masayuki
中科院分区：
文献类型：
--
作者：
Yamaji, Hiroki;Fukuda, Tatsuya;Maki, Masayuki
利用核糖体DNA内部转录间隔序列（ITS）对分类复杂类群细辛节（Asarum sect. Asiasarum）进行了系统发育分析。对共14个分类群和地理种族的99个样本进行直接测序，并对其中32个样本进行克隆分析，为该群体发生了广泛的网状进化提供了新的见解。8个类群ITS序列有轻微多态性或无多态性。另一方面，其他5个分类群的多态性ITS序列与分类群中识别的两种核糖型完全相同或几乎相同，只有轻微或没有多态性，可能是二倍体杂交起源，并保留了亲本核糖型。在生物地理意义上，假定日本列岛和大陆之间至少有四次相互作用，包括迁移、杂交和渗透，两次通过南部路线，从朝鲜半岛，两次通过北部路线，从库页岛或直接从欧亚大陆。(c) 2007爱思唯尔公司版权所有。
Phylogenetic analyses were performed for the taxonomically complicated group, Asarum sect. Asiasarum, using internal transcribed spacers (ITS) of nuclear ribosomal DNA. Direct sequences for 99 samples of a total of 14 taxa and geographic races and cloning analyses for 32 of these samples provided new insights that extensive reticulate evolution has occurred in this group. Eight taxa had slight or no polymorphism of the ITS sequences. On the other hand, the other five taxa had polymorphic ITS sequences composed of two ribotypes that were completely the same or almost the same as the sequences recognized in the taxa with only slight or no polymorphism, and were probably of diploid hybrid origin and to have retained their parental ribotypes. In terms of biogeographic implications, at least four interactions including migration, hybridization, and introgression, were presumed between the Japanese Archipelago and the continents, two times via a southern route, from the Korean Peninsula, and two times via a northern route, from Sakhalin or directly from the Eurasian continent. (c) 2007 Elsevier Inc. All rights reserved.