Some plants have a genetic superpower that may help them survive a cataclysm

A new study published in *Cell* suggests polyploidy—a genetic trait where plants have more than two chromosome sets—may act as a survival mechanism during environmental crises. Led by Yves Van de Peer, a plant biologist at Ghent University in Belgium, the research analyzed 470 flowering plant genomes to track whole-genome duplication events over the last 150 million years. The findings indicate these duplications frequently occurred during periods of dramatic climate change, such as cooling or warming episodes, or mass extinctions. Polyploidy, though evolutionarily costly, appears to confer resilience under stress. For example, plants with duplicated genomes may better adapt to reduced light or temperature shifts by leveraging extra genes for photosynthesis. This contradicts earlier assumptions that extra chromosomes would hinder survival, instead revealing a paradox: why polyploid plants thrive despite their genetic burden. Van de Peer’s team identified clusters of genome duplications during Earth’s most turbulent events, including the asteroid impact 66 million years ago that wiped out the dinosaurs. Polyploid plants survived this cataclysm, suggesting their genetic flexibility provided a critical advantage. The study highlights how environmental stress can drive evolutionary leaps, even if they come with long-term trade-offs. The research also explains why polyploidy is rare in ancient plant lineages but common today. Most genome duplications fail over time, but those occurring during crises persist, shaping modern plant diversity. Van de Peer describes these polyploid plants as ‘hopeful monsters,’ capable of thriving in harsh conditions where other species falter. By mapping duplication events to fossil records, the team confirmed these genetic shifts were not random but tied to environmental upheaval. The work resolves a long-standing question: why polyploidy, despite its drawbacks, remains widespread. The answer lies in its role as a survival tool during Earth’s most extreme periods.