Natural variation for fertile triploid F1 hybrid formation in allohexaploid wheat speciation |
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Authors: | Yoshihiro Matsuoka Shigeo Takumi Taihachi Kawahara |
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Institution: | (1) Fukui Prefectural University, Matsuoka, Eiheiji, Yoshida, Fukui 910-1195, Japan;(2) Department of Biological and Environmental Science, Faculty of Agriculture, and Graduate School of Science and Technology, Kobe University, Kobe Hyogo, 657-8501, Japan;(3) Graduate School of Agriculture, Kyoto University, Muko Kyoto, 617-0001, Japan |
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Abstract: | The tempo, mode, and geography of allopolyploid speciation are influenced by natural variation in the ability of parental
species to express postzygotic reproductive phenotypes that affect hybrid fertility. To shed light on the impact of such natural
variations, we used allohexaploid Triticum aestivum wheats’ evolution as a model and analyzed the geographic and phylogenetic distributions of Aegilops tauschii (diploid progenitor) accessions involved in the expression of abnormality and fertility in triploid F1 hybrids with Triticum turgidum (tetraploid progenitor). Artificial-cross experiments and chloroplast-DNA-based evolutionary analyses showed that hybrid-abnormality-causing
accessions had limited geographic and phylogenetic distributions, indicative that postzygotic hybridization barriers are underdeveloped
between these species. In contrast, accessions that are involved with fertile triploid F1 hybrid formation have wide geographic and phylogenetic distributions, indicative of a deep evolutionary origin. Wide-spread
hybrid-fertilizing accessions support the theory that T. aestivum speciation occurred at multiple sites within the species range of Ae. tauschii, in which existing conditions enabled natural hybridization with T. turgidum. Implications of our findings on how natural variation in the ability of Ae. tauschii to express those postzygotic reproductive phenotypes diversified and contributed to the speciation of T. aestivum are discussed.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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