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Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.
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Grass genome structure and evolution.

Joachim Messing1, Jeffrey L Bennetzen

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Genome Dynamics
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Plant genome plasticity is driven by

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Last Updated: Jul 2, 2026

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Area of Science:

  • Plant genomics
  • Evolutionary biology
  • Molecular genetics

Background:

  • Comparative sequencing of orthologous plant genome regions aids in understanding chromosomal evolution.
  • The Poaceae family, including cereal crops, has been a key focus for such studies.
  • Genome size variation among related species presents unique research opportunities.

Purpose of the Study:

  • To review the current understanding of plant genome plasticity.
  • To highlight the mechanisms driving chromosomal rearrangements.
  • To emphasize maize as a model organism for studying genome evolution.

Main Methods:

  • Sequencing of orthologous regions from related plant species.
  • Alignment of sequences to analyze chromosomal evolution.
  • Comparative genomics approaches.

Main Results:

  • Chromosomal evolution is characterized by 'cut and paste' and 'copy and paste' rearrangement mechanisms.
  • 'Copy and paste' mechanisms, mainly transposon amplification, drive genome expansion.
  • Deletions via recombination counteract expansion in certain regions.

Conclusions:

  • Plant genomes exhibit significant plasticity, influenced by duplication and deletion processes.
  • Transposon activity and recombination are key drivers of genome size and structure changes.
  • Maize serves as a valuable model for dissecting these complex genomic dynamics.