Phylogeny and evolutionary history of Leymus (Triticeae; Poaceae) based on a single-copy nuclear gene encoding plastid acetyl-CoA carboxylase.
Phylogeny and evolutionary history of Leymus (Triticeae; Poaceae) based on a single-copy nuclear gene encoding plastid acetyl-CoA carboxylase.
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基于编码质体乙酰辅酶A羧化酶的单拷贝核基因的羊草（小麦科；禾本科）的系统发育和进化史
DOI：
10.1186/1471-2148-9-247
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发表时间：
2009-10-08
影响因子：
3.4
通讯作者：
Zhou YH
中科院分区：
文献类型：
--
作者：
Fan X;Sha LN;Yang RW;Zhang HQ;Kang HY;Ding CB;Zhang L;Zheng YL;Zhou YH
背景单拷贝和低拷贝基因不太可能发生协同进化，因此是研究多倍体类群起源和进化的理想工具。赖草属植物的基因组组成为NsXm，其中Ns可能起源于新麦草属（Psathyrostachys），而Xm代表一个未知来源的基因组。此外，赖草属植物的进化史也知之甚少。结果利用等位基因特异性引物，从几乎所有的赖草属植物中分离到两个Acc 1基因的同源序列，并与小麦族18个基本基因组的35个二倍体类群的同源序列进行了比较分析。序列多样性分析和系统发育分析表明：（1）赖草属与新麦草属、冰草属和旱麦草属亲缘关系较近，新麦草是赖草属的祖先Ns基因组供体，（3）赖草属的Xm基因组可能来自冰草属和小偃麦草属的祖先，（4）青藏高原赖草属的Acc 1序列在进化上存在差异，（5）青藏高原赖草属的Acc 1序列可能与新麦草属的同源性较高。（5）北美赖草属物种可能起源于白令陆桥的定殖，（6）赖草属物种起源于欧亚大陆的时间约为11- 12 MYA，在3.7- 4.3MYA和1.7- 2.1MYA的时间里，赖草属物种可能发生了适应性辐射。推测赖草属植物的适应性辐射可能是由青藏高原的隆升和随后的气候振荡所触发的。适应性辐射可能促进了赖草属物种的快速形成，以及独特形态特征的固定。这些结果为我们理解赖草属植物Xm基因组的起源、多倍化事件和进化历史提供了新的线索，从而解释了赖草属植物丰富的多样性和生态适应性。
BackgroundSingle- and low- copy genes are less likely subject to concerted evolution, thus making themselves ideal tools for studying the origin and evolution of polyploid taxa.Leymusis a polyploid genus with a diverse array of morphology, ecology and distribution in Triticeae. The genomic constitution ofLeymuswas assigned as NsXm, where Ns was presumed to be originated fromPsathyrostachys, while Xm represented a genome of unknown origin. In addition, little is known about the evolutionary history ofLeymus. Here, we investigate the phylogenetic relationship, genome donor, and evolutionary history ofLeymusbased on a single-copy nuclearAcc1gene.ResultsTwo homoeologues of theAcc1gene were isolated from nearly all the sampledLeymusspecies using allele-specific primer and were analyzed with those from 35 diploid taxa representing 18 basic genomes in Triticeae. Sequence diversity patterns and genealogical analysis suggested that (1)Leymusis closely related toPsathyrostachys,Agropyron, andEremopyrum; (2)Psathyrostachys junceais an ancestral Ns-genome donor ofLeymusspecies; (3) the Xm genome inLeymusmay be originated from an ancestral lineage ofAgropyronandEremopyrum triticeum; (4) theAcc1sequences ofLeymusspecies from the Qinghai-Tibetan plateau are evolutionarily distinct; (5) North AmericaLeymusspecies might originate from colonization via the Bering land bridge; (6)Leymusoriginated about 11-12MYA in Eurasia, and adaptive radiation might have occurred inLeymusduring the period of 3.7-4.3 MYA and 1.7-2.1 MYA.ConclusionLeymusspecies have allopolyploid origin. It is hypothesized that the adaptive radiation ofLeymusspecies might have been triggered by the recent upliftings of the Qinghai-Tibetan plateau and subsequent climatic oscillations. Adaptive radiation may have promoted the rapid speciation, as well as the fixation of unique morphological characters inLeymus. Our results shed new light on our understanding of the origin of Xm genome, the polyploidization events and evolutionary history ofLeymusthat could account for the rich diversity and ecological adaptation ofLeymusspecies.
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影响因子：
10.7
作者：
Kilian, B.;Ozkan, H.;Salamini, F.
通讯作者：
Salamini, F.
DOI：
10.1046/j.1471-8286.2002.00313.x
发表时间：
2002-12-01
期刊：
MOLECULAR ECOLOGY NOTES
影响因子：
--
作者：
Filatov, DA
通讯作者：
Filatov, DA
影响因子：
5.2
作者：
Huang, SX;Su, XJ;Gornicki, P
通讯作者：
Gornicki, P
影响因子：
3
作者：
Anamthawat-Jónsson, K;Bödvarsdóttir, SK
通讯作者：
Bödvarsdóttir, SK
影响因子：
3.1
作者：
Bödvarsdóttir, SK;Anamthawat-Jónsson, K
通讯作者：
Anamthawat-Jónsson, K