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Inferred chromosome morphology of the ancestral genome ofTriticum

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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 ofElytrigia elongata. This evidence and data on cross-compatibility and morphological characteristics suggested that the genusTriticum is a result of adaptive radiation from the perennial genusElytrigia, specifically from the complex of species possessing the E genome or one closely related to it.

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Authors and Affiliations

  1. Department of Agronomy & Range Science, University of California, 95616, Davis, CA, USA

    J. Dvořák & P. E. McGuire

  2. Research and Development Authority, Ben Gurion University, Beer Sheva, Israel

    S. Mendlinger

Authors
  1. J. Dvořák
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  2. P. E. McGuire
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  3. S. Mendlinger
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Dvořák, J., McGuire, P.E. & Mendlinger, S. Inferred chromosome morphology of the ancestral genome ofTriticum . Pl Syst Evol 144, 209–220 (1984). https://doi.org/10.1007/BF00984134

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  • DOI: https://doi.org/10.1007/BF00984134

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