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Genome Evolution in Plants: Complex Thalloid Liverworts (Marchantiopsida).
Anna-Malin Linde1, Shilpi Singh2, John L Bowman2
1Department of Plant Ecology and Evolution, Evolutionary Biology Centre, Uppsala University, Sweden.
Genome Biology and Evolution
|February 2, 2023
Summary
Liverwort genomes are small and stable due to low gene duplication, transposable element (TE) activity, and chromosomal rearrangements, unlike other plants. Lunularia cruciata shows larger genome size primarily from Ty3/Gypsy retrotransposons.
Area of Science:
- Plant genomics
- Evolutionary biology
- Comparative genomics
Background:
- Liverworts (Marchantiophyta) exhibit unusually small and stable genomes compared to angiosperms and gymnosperms.
- Understanding the evolutionary mechanisms behind these genomic characteristics is crucial for plant evolution studies.
Purpose of the Study:
- To investigate the genomic factors contributing to the small genome size and stability in liverworts.
- To compare genome evolution across five liverwort species, focusing on gene characteristics, transposable elements, collinearity, and sex chromosomes.
Main Methods:
- Quantification of genome evolution metrics including gene characteristics and transposable element (TE) landscape.
- Analysis of chromosomal collinearity and sex chromosome evolution across five liverwort species.
- Comparative genomic analysis to identify factors influencing genome size and stability.
Main Results:
- No significant genome duplications were found in the examined liverworts, with low levels of duplicated genes.
- Lunularia cruciata displayed a genome size nearly double that of other species, mainly due to Ty3/Gypsy retrotransposon activity.
- Intrachromosomal rearrangements were frequent but slower than in angiosperms; a translocation involving a sex chromosome was identified.
Conclusions:
- Low gene duplication, controlled transposable element activity, and reduced chromosomal rearrangement rates likely explain the small and stable genomes of liverworts.
- These factors may also contribute to the observed slow rate of morphological evolution in liverworts.
- Genomic stability in liverworts is maintained through a combination of reduced duplication, TE regulation, and slower rearrangement dynamics.
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