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Allopolyploidization-accommodated genomic sequence changes in triticale.

Xue-Feng Ma1, J Perry Gustafson

  • 1Department of Agronomy, University of Missouri-Columbia, MO 65211, USA.

Annals of Botany
|February 7, 2008
PubMed
Summary
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Triticale (x Triticosecale) exhibits extensive genomic changes, with the rye genome showing more variation than wheat. Most modifications occur before chromosome doubling, highlighting rapid genome evolution in this artificial allopolyploid.

Area of Science:

  • Plant genomics
  • Evolutionary biology
  • Crop science

Background:

  • Allopolyploidization is a key driver of plant speciation.
  • Genetic and epigenetic changes shape allopolyploids, with varying rates across species.
  • Triticale (x Triticosecale) serves as a model for studying complex allopolyploid evolution due to its recent origin and diverse germplasm.

Purpose of the Study:

  • To review recent genomics studies in hexaploid and octoploid triticales.
  • To discuss mechanisms driving genomic changes in triticale.
  • To compare genomic changes in triticale with other allopolyploid species.

Main Methods:

  • Genomics studies in hexaploid and octoploid triticales.
  • Analysis of genetic and epigenetic modifications.

Related Experiment Videos

  • Comparative genomics of allopolyploid species.

    • Main Results:

    • Triticale shows extensive non-additive sequence changes, exceeding those in other allopolyploids.
    • The rye genome undergoes more changes than the wheat genome.
    • Sequence modification and elimination are major forces of genome variation, with most changes occurring pre-chromosome doubling.

    Conclusions:

    • Triticale exhibits rapid and extensive genomic variation, particularly in the rye genome.
    • Sequence changes are influenced by genome relationships, ploidy, and sequence types.
    • Cytoplasm and parental genome relationships are critical factors in the timing and extent of genomic variation during allopolyploidization.