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タイトル: | Intraspecific lineage divergence and its association with reproductive trait change during species range expansion in central Eurasian wild wheat Aegilops tauschii Coss. (Poaceae) Phylogenetics and phylogeography |
著者: | Matsuoka, Yoshihiro Takumi, Shigeo Kawahara, Taihachi |
著者名の別形: | 河原, 太八 |
キーワード: | Adaptation Dispersal Flowering time Life history Natural variation Phenology Spike and spikelet traits Species range expansion |
発行日: | 30-Sep-2015 |
出版者: | BioMed Central Ltd. |
誌名: | BMC Evolutionary Biology |
巻: | 15 |
論文番号: | 213 |
抄録: | Background: How species ranges form in landscapes is a matter of long-standing evolutionary interest. However, little is known about how natural phenotypic variations of ecologically important traits contribute to species range expansion. In this study, we examined the phylogeographic patterns of phenotypic changes in life history (seed production) and phenological (flowering time) traits during the range expansion of Aegilops tauschii Coss. from the Transcaucasus and Middle East to central Asia. Results: Our comparative analyses of the patterns of natural variations for those traits and their association with the intraspecific lineage structure showed that (1) the eastward expansion to Asia was driven by an intraspecific sublineage (named TauL1b), (2) high seed production ability likely had an important role at the initial dispersal stage of TauL1b's expansion to Asia, and (3) the phenological change to early flowering phenotypes was one of the key adaptation events for TauL1b to further expand its range in Asia. Conclusions: This study provides for the first time a broad picture of the process of Ae. tauschii's eastward range expansion in which life history and phenological traits may have had respective roles in its dispersal and adaptation in Asia. The clear association of seed production and flowering time patterns with the intraspecific lineage divergence found in this study invites further genetic research to bring the mechanistic understanding of the changes in these key functional traits during range expansion within reach. |
著作権等: | © 2015 Matsuoka et al. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
URI: | http://hdl.handle.net/2433/212523 |
DOI(出版社版): | 10.1186/s12862-015-0496-9 |
PubMed ID: | 26419628 |
出現コレクション: | 学術雑誌掲載論文等 |
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