Inferred chromosome morphology of the ancestral genome of Triticum

J. Dvořák, P. E. McGuire, S. Mendlinger

    Research output: Contribution to journalArticlepeer-review

    23 Scopus citations

    Abstract

    The lengths of the A, B, and D genomes of common wheat, Triticum aestivum, were measured from the karyotype. Relative to the B genome, standardized as length 1.000, the lengths of the A and D genomes were 0.835 and 0.722, respectively. The lengths of the chromosome arms in the A and D genomes were then multiplied by the appropriate constants so that the total lengths of each genome also equalled 1.000. These calculations revealed that homoeologous chromosomes in wheat, with a few exceptions, have similar sizes and arm ratios. The arm lengths of the three homoeologues in each homoeologous group were then averaged. These average chromosomes turned out to be remarkably similar, in size and arm ratio, to their homoeologues in the E genome of Elytrigia elongata. This evidence and data on cross-compatibility and morphological characteristics suggested that the genus Triticum is a result of adaptive radiation from the perennial genus Elytrigia, specifically from the complex of species possessing the E genome or one closely related to it.

    Original languageEnglish
    Pages (from-to)209-220
    Number of pages12
    JournalPlant Systematics and Evolution
    Volume144
    Issue number3-4
    DOIs
    StatePublished - 1 Sep 1984

    Keywords

    • Angiosperms
    • Elytrigia
    • Evolution
    • Poaceae
    • Triticum
    • genome
    • karyotype
    • wheat

    ASJC Scopus subject areas

    • Ecology, Evolution, Behavior and Systematics
    • Plant Science

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