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Natural variation for fertile triploid F1 hybrid formation in allohexaploid wheat speciation

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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.

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Acknowledgments

We thank J. Valkoun (ICARDA), J. Konopka (ICARDA), H. Bockelman (USDA), A. Graqner (IPK), and L. Visser (CGN) for the Ae. tauschii accession seeds. This work was supported by a Green Technology Project grant (GD-2006) from the Ministry of Agriculture, Forestry, and Fishery of Japan to YM and, in part, by a grant from the Ministry of Education, Culture, Sports, Science and Technology, Japan (Basic Research A, No. 17201045).

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Authors and Affiliations

  1. Fukui Prefectural University, Matsuoka, Eiheiji, Yoshida, Fukui, 910-1195, Japan

    Yoshihiro Matsuoka

  2. Department of Biological and Environmental Science, Faculty of Agriculture, and Graduate School of Science and Technology, Kobe University, Kobe, Hyogo, 657-8501, Japan

    Shigeo Takumi

  3. Graduate School of Agriculture, Kyoto University, Muko, Kyoto, 617-0001, Japan

    Taihachi Kawahara

Authors
  1. Yoshihiro Matsuoka
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  2. Shigeo Takumi
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  3. Taihachi Kawahara
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Correspondence to Yoshihiro Matsuoka.

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Communicated by R. Waugh.

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Matsuoka, Y., Takumi, S. & Kawahara, T. Natural variation for fertile triploid F1 hybrid formation in allohexaploid wheat speciation. Theor Appl Genet 115, 509–518 (2007). https://doi.org/10.1007/s00122-007-0584-3

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