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题名: Cryptic and repeated "allopolyploid" speciation within Allium przewalskianum Regel. (Alliaceae) from the Qinghai-Tibet Plateau
作者: Liang, QL; Hu, XX; Wu, GL; Liu, JQ(刘建全)
收录类别: SCIE
出版日期: 2015-06
刊名: ORGANISMS DIVERSITY & EVOLUTION
卷号: 15, 期号:2, 页码:265-276
出版者: SPRINGER
出版地: HEIDELBERG
英文摘要: Polyploidization has contributed greatly to current plant diversity. Allopolyploid speciation, which can rapidly overcome meiosis abnormalities, is a common and repeated process in numerous genera. However, most polyploids within a single morphological/taxonomic species have been considered autopolyploids, which were assumed to arise through spontaneous genome doubling and/or following the fusion of unreduced diploid gametes. It remains untested whether these intraspecific polyploids may also be the result of 'allopolyploid' hybridizations between differentiated diploid populations and whether such speciation has also occurred repeatedly. In this study, we examined the diploid-tetraploid species Allium przewalskianum on the Qinghai-Tibet Plateau (QTP) to test this cryptic speciation hypothesis under morphological stasis, based on three sets of nuclear genetic data (AFLP, ITS, and CHS) and niche modeling. Our analyses of the three datasets together revealed that the diploid populations across the northeastern to southeastern QTP exhibit strong geographical differentiation. Based on the shared nuclear lineages fixed in the different diploids, three tetraploid groups in the northern, southern, and eastern QTP were identified as having originated independently, through "allopolyploid" hybridization between the differentiated diploids. Ecological niche modeling based on ecological variables suggested distinct niche differentiation between two tetraploid groups in the northern and southern QTP and also between these and the diploid populations. Furthermore, they also differed in their responses to past climate changes. These findings together suggested that at least two tetraploid groups had originated independently through hybridizations between the differentiated diploid populations. Our results highlight the cryptic allopolyploid speciation underlying a single morphological species, which mirrors well the repeated allopolyploid speciations within the genus. This allopolyploid speciation may prevail within the diploid-polyploid species complex that is classified as a single morphological species; indeed, the underlying cryptic speciation and evolutionary dynamics are certainly more complex than previously assumed.
关键词: Allium przewalskianum ; Allopolyploid speciation ; Cryptic divergence ; Niche modeling ; Qinghai-Tibet Plateau
作者部门: [Liang, Qianlong ; Liu, Jianquan] Sichuan Univ, Coll Life Sci, MOE Key Lab Bioresources & Ecoenvironm, Chengdu 610065, Peoples R China ; [Hu, Xiaoxiao ; Wu, Guili ; Liu, Jianquan] Lanzhou Univ, Sch Life Sci, State Key Lab Grassland Ecosyst, Lanzhou 730000, Peoples R China
通讯作者: Liu, JQ (reprint author), Sichuan Univ, Coll Life Sci, MOE Key Lab Bioresources & Ecoenvironm, Chengdu 610065, Peoples R China.
学科分类: Evolutionary Biology; Zoology
文章类型: Article
所属项目编号: National Key Project for Basic Research [2014CB954100] ; Sichuan Province Youth Science and Technology Innovation Team [2014TD003] ; National Natural Science Foundation of China [30725004]
所属项目名称: 国家杰出青年科学基金项目 ; 国家重点基础研究发展计划以及国家重大科学研究计划(973计划)
项目资助者: NSFC ; MOST
语种: 英语
DOI: 10.1007/s13127-014-0196-0
ISSN号: 1439-6092
WOS记录号: WOS:000355833700004
IR记录号: WOS:000355833700004
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内容类型: 期刊论文
URI标识: http://ir.lzu.edu.cn/handle/262010/181830
Appears in Collections:生命科学学院_期刊论文

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Recommended Citation:
Liang, QL,Hu, XX,Wu, GL,et al. Cryptic and repeated "allopolyploid" speciation within Allium przewalskianum Regel. (Alliaceae) from the Qinghai-Tibet Plateau[J]. ORGANISMS DIVERSITY & EVOLUTION,2015,15(2):265-276.
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