Phylogenetic relationships and Y genome origin in Elymus L. sensu lato (Triticeae; Poaceae) based on single-copy nuclear Acc1 and Pgk1 gene sequences
Phylogenetic relationships and Y genome origin in Elymus L. sensu lato (Triticeae; Poaceae) based on single-copy nuclear Acc1 and Pgk1 gene sequences
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基于单拷贝核 Acc1 和 Pgk1 基因序列的披碱草（小麦科；禾本科）的系统发育关系和 Y 基因组起源
DOI：
10.1016/j.ympev.2013.06.012
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发表时间：
2013-12-01
影响因子：
4.1
通讯作者：
Zhou, Yong-Hong
中科院分区：
文献类型：
--
作者：
Fan, Xing;Sha, Li-Na;Zhou, Yong-Hong
目的：探讨梭梭属多倍体物种的起源和基因组亲缘关系。从广义上讲，我们分析了小麦族18个基本基因组的35个二倍体分类群和18个四倍体（StH和StY基因组）和14个六倍体（StStH、StYP、StYH和StYW基因组）的两个不连锁的单拷贝核基因（Acc 1和Pgk 1）序列。序列分析和系统发育分析表明：（1）St、H、W和P基因组分别来源于拟鹅观草属、大麦属、南方古猿属和冰草属，而Y基因组与圣围带草属的Xp基因组关系密切;（2）不同的六倍体Escherichus s.l.（3）由于不完全的谱系分类和/或杂交事件，两个基因树之间的谱系冲突表明，一些Escherichus s.l.（4）StH基因组种为Escherichus sensu stricto，StY基因组种为鹅观草属，StYW基因组种为Anthosachne，StYH基因组种为Campeiostachys，StYP基因组种为仲彬草属。多源和渐渗现象的发生是造成该属丰富多样性和生态适应性的重要原因。物种(C)2013 Elsevier Inc. All rights reserved.
To estimate the origin and genomic relationships of the polyploid species within Elymus L. sensu lato, two unlinked single-copy nuclear gene (Acc1 and Pgk1) sequences of eighteen tetraploids (StH and StY genomes) and fourteen hexaploids (StStH, StYP, StYH, and StYW genomes) were analyzed with those of 35 diploid taxa representing 18 basic genomes in Triticeae. Sequence and phylogenetic analysis suggested that: (1) the St, H, W, and P genomes were donated by Pseudoroegneria, Hordeum, Australopyrum, and Agropyron, respectively, while the Y genome is closely related to the Xp genome in Peridictyon sanctum; (2) different hexaploid Elymus s.l. species may derived their StY genome from different StY genome tetraploid species via independent origins; (3) due to incomplete lineage sorting and/or hybridization events, the genealogical conflict between the two gene trees suggest introgression involving some Elymus s.l. species, Pseudoroegneria, Agropyron and Aegilops/Triticum; (4) it is reasonable to recognize the StH genome species as Elymus sensu stricto, the StY genome species as Roegneria, the StYW genome species as Anthosachne, the StYH genome species as Campeiostachys, and the StYP genome species as Kengyilia. The occurrence of multiple origin and introgression could account for the rich diversity and ecological adaptation of Elymus s.l. species. (C) 2013 Elsevier Inc. All rights reserved.