Gene co-option across scales shapes plant diversity.
Di Stilio VS, Garcia AGK
Plant Evolution
Every bizarre flower shape, carnivorous trap, or prickly stem you've ever marveled at in a botanical garden likely evolved by rewiring ancient genes that once did something entirely different — meaning evolution is less about inventing new parts and more about creatively reusing old ones.
Plants didn't need to invent new genes to become wildly different from each other — they just kept repurposing the genes they already had for brand-new jobs. The same core set of genetic instructions gets reshuffled across millions of years to produce everything from pitcher plants that eat insects to orchids that trick bees into fake mating. Scientists are now finding that distantly related plants often independently hit upon the same genetic solutions, like different engineers arriving at the same design.
Key Findings
Gene co-option — reusing existing genes for new developmental functions — is now recognized as a central driver of plant morphological diversity, not a rare exception.
Distantly related plant lineages independently recruit similar 'molecular toolkits' to build analogous structures, revealing deep shared genetic heritage underlying traits like carnivory, prickles, and sexual deception in flowers.
The explosion of available plant genome sequences is rapidly uncovering how the same ancestral genes get rewired into new networks across the entire land plant tree of life.
chevron_right Technical Summary
Plants repeatedly reuse the same ancient genes for completely different jobs throughout evolution — the same genetic toolkit that makes one flower stinky can be repurposed to make another plant carnivorous. This 'gene co-option' turns out to be a primary engine behind the stunning variety of plant forms on Earth.
Abstract Preview
Of the different modes of evolution affecting plant diversification - novel genes, expansion and co-option - the latter holds an especially powerful framework for integrative biology. Beyond the in...
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