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Research article - Peer-reviewed, 2009

Evolutionary process of Hordeum brachyantherum 6x and related tetraploid species revealed by nuclear DNA sequences

Komatsuda, Takao; Salomon, Bjoern; von Bothmer, Roland


A hexaploid form of Hordeum brachlyantherum ssp. brachyantherum was discovered in California in 1980, and its origin has since been studied over the past three decades. We applied EF-G, a nuclear DNA sequence, to infer the parents of the hexaploid form. In polyploid taxa, amplified DNAs were cloned into a vector, and EF-G copies were amplified from the colonies by PCR and digested with restriction enzymes to separate different types. Phylogenetic analysis was performed based on the DNA sequences. The result showed that H. brachyantherum ssp. brachyantherum 6x and 4x carried one identical DNA sequence of 910 bp, and had closely related DNA sequences of 931 bp. H. brachyantherum ssp. brachyantherum 6x and H. marinum ssp. gussoneanum 2x shared one identical DNA sequence of 915 bp. From these results we hypothesized that H. brachyantherum ssp. brachyantherum 6x has evolved by an outcrossing between H. marinum ssp. gussoneanum 2x and H. brachyantherum ssp. brachyantherum 4x, followed by a chromosome doubling. Our results also indicate that H. marinum was involved in the polyploidization of H. secalinum, H. capense, and H. marinum. The origins of H. jubatum and H. depressum are discussed.


Polyploidization; chloroplast translation elongation factor-G (EF-G); speciation; evolution; Triticeae

Published in

Breeding Science
2009, Volume: 59, number: 5, pages: 611-616

    SLU Authors

    • Salomon Dödsbo, Björn

      • Department of Crop Science, Swedish University of Agricultural Sciences
    • UKÄ Subject classification

      Landscape Architecture
      Agricultural Science
      Environmental Sciences related to Agriculture and Land-use
      Forest Science

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