The study, led by Catherine Collins, Dr. Luke Dunning and Dr. Lara Pereira from the University of Sheffield in collaboration with researchers from Yale and Bangor Universities, examined how grasses "steal" DNA from other species.
Published in Molecular Biology and Evolution, the research reveals that while thousands of genes may be transferred between species, the overwhelming majority of them end up on the cutting room floor - truncated, broken, or chemically "erased" . Much like email spam, many of the genetic “messages” don’t provide the plant with any benefit.
So is it all junk? Some of these genes actually enable plants to adapt faster. By analysing the grass Alloteropsis, the researchers identified that the useful genes usually have autonomous switches to maintain their function after they move, helping the recipient plant gain new traits almost instantly.
For instance, some grasses have stolen genes that allow them to thrive in hot, high-light environments by completely taking over the plant's metabolic workload, while the original, native genes are "demoted" to basic housekeeping tasks.
The findings indicate that gene swapping is a major engine for innovation in the plant world. This shift in understanding highlights how the architecture of a gene - not just its code - determines whether a plant can successfully "borrow" its way to a more resilient future.
Our research expands our understanding of how genes move between plants - not just from parents, but from different species that grow close together. A lot of this transferred DNA doesn’t do anything useful, but occasionally a plant keeps a gene that gives it an advantage. This gives plants extra genetic “tools,” which can help them adapt more quickly when their environment changes.
Catherine Collins