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  • 1.
    Cardoni, Simone
    et al.
    Department of Agricultural and Forestry Science (DAFNE) Università degli studi della Tuscia Viterbo 01100 Italy.
    Piredda, Roberta
    Department of Veterinary Medicine University of Bari ‘Aldo Moro’ Valenzano 70010 Italy.
    Denk, Thomas
    Swedish Museum of Natural History, Department of Paleobiology.
    Grimm, Guido W.
    Unaffiliated, Orléans France.
    Papageorgiou, Aristotelis C.
    Department of Molecular Biology and Genetics Democritus University of Thrace Alexandroupolis Greece.
    Schulze, Ernst‐Detlef
    Max‐Planck Institute for Biogeochemistry Jena 07701 Germany.
    Scoppola, Anna
    Department of Agricultural and Forestry Science (DAFNE) Università degli studi della Tuscia Viterbo 01100 Italy.
    Salehi Shanjani, Parvin
    Natural Resources Gene Bank, Research Institute of Forests and Rangelands Agricultural Research, Education and Extension Organization Tehran Iran.
    Suyama, Yoshihisa
    Graduate School of Agricultural Science Tohoku University Osaki Miyagi 989‐6711 Japan.
    Tomaru, Nobuhiro
    Graduate School of Bioagricultural Sciences Nagoya University Nagoya Aichi 464‐8601 Japan.
    Worth, James R. P.
    Ecological Genetics Laboratory Forestry and Forest Products Research Institute (FFPRI) Tsukuba Ibaraki 305‐8687 Japan.
    Cosimo Simeone, Marco
    Department of Agricultural and Forestry Science (DAFNE) Università degli studi della Tuscia Viterbo 01100 Italy.
    5S‐IGS rDNA in wind‐pollinated trees ( Fagus L.) encapsulates 55 million years of reticulate evolution and hybrid origins of modern species2021In: The Plant Journal, ISSN 0960-7412, E-ISSN 1365-313X, Vol. 109, no 4, p. 909-926Article in journal (Refereed)
    Abstract [en]

    Standard models of plant speciation assume strictly dichotomous genealogies in which a species, theancestor, is replaced by two offspring species. The reality in wind-pollinated trees with long evolutionaryhistories is more complex: species evolve from other species through isolation when genetic drift exceeds gene flow; lineage mixing can give rise to new species (hybrid taxa such as nothospecies and allopolyploids). The multi-copy, potentially multi-locus 5S rDNA is one of few gene regions conserving signal from dichotomous and reticulate evolutionary processes down to the level of intra-genomic recombination. Therefore, it can provide unique insights into the dynamic speciation processes of lineages that diversified tens of millions of years ago. Here, we provide the first high-throughput sequencing (HTS) of the 5S intergenic spacers (5S-IGS) for a lineage of wind-pollinated subtropical to temperate trees, the Fagus crenata – F.sylvatica s.l. lineage, and its distant relative F. japonica. The observed 4963 unique 5S-IGS variants reflect acomplex history of hybrid origins, lineage sorting, mixing via secondary gene flow, and intra-genomic competition between two or more paralogous-homoeologous 5S rDNA lineages. We show that modern species are genetic mosaics and represent a striking case of ongoing reticulate evolution during the past 55 million years.

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