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Comparative Genome Analysis Reveals Divergent Genome Size Evolution in a Carnivorous Plant Genus
Giang T H Vu1,2, Thomas Schmutzer1, Fabian Bull1
1Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstrasse 3, 06466, Gatersleben, Germany.
The Plant Genome
|November 24, 2020
Summary
Genome size in the Genlisea genus evolved bidirectionally, with some species shrinking via deletion and others expanding through whole-genome duplication (WGD). These evolutionary changes may be selectively neutral.
Area of Science:
- Evolutionary Biology
- Genomics
- Plant Science
Background:
- The C-value paradox, unexplained genome size variation, is prominent in flowering plants (2,350-fold range).
- The carnivorous plant genus Genlisea exhibits significant genome size variation (25-fold), making it a model for studying evolutionary genome dynamics.
Purpose of the Study:
- To investigate the mechanisms and consequences of genome size evolution in the genus Genlisea.
- To understand the evolutionary trajectory of genome size in Genlisea using genomic, phylogenetic, and cytogenetic methods.
Main Methods:
- Genomic analysis to assess genome size and repeat content.
- Phylogenetic analysis to establish evolutionary relationships.
- Cytogenetic approaches to investigate genome structure and duplication events.
Main Results:
- Genome size evolution in Genlisea is bidirectional: G. nigrocaulis genome shrunk significantly, while G. hispidula expanded via whole-genome duplication (WGD) and retrotransposition.
- G. hispidula is an allotetraploid, and G. pygmaea is a recent (auto)tetraploid.
- A common ancestor with an intermediate genome size (400-800 Mbp) is inferred, with subsequent rapid divergence.
Conclusions:
- Recurrent WGD may prevent essential gene loss during genome shrinkage.
- The observed genome size changes might be selectively neutral, as no consistent correlation with habitat or life strategy was found.
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