A three-step model for the establishment of polyploid plants.
Bonte D, Van de Peer Y
Polyploidy
Many of the vegetables and fruits in your garden — strawberries, potatoes, wheat — are polyploids, and understanding why some of these genome-doubled plants persist while most vanish could reshape how breeders develop the next generation of resilient crops.
Some plants accidentally end up with double the normal number of chromosomes — a bit like getting a second copy of every book in a library at once. This can give them a short-term boost, helping them pop up in disturbed or stressful places. But the new research shows that most of these 'doubled' plants eventually disappear; only a rare few manage to carve out their own niche and stick around for the long haul.
Key Findings
Polyploid plants (those with doubled genomes) form more readily under stressful environmental conditions, when plants more often produce unreduced gametes and ecological filtering is relaxed.
Two distinct bridging pathways exist: a rare short-term route where genome doubling generates phenotypic variation that occasionally fits a new environment, and a longer-term route where population dynamics allow polyploids to persist despite early disadvantages.
Despite frequent short-term establishment success, only a small fraction of polyploid lineages persist over macroevolutionary timescales, meaning adaptation typically follows establishment rather than causing it.
chevron_right Technical Summary
Scientists propose a three-step framework called Supply-Bridging-Consolidation to explain why plants that double their entire genome often thrive briefly but rarely survive over millions of years. The model reframes success as a matter of timing and opportunity rather than immediate adaptation.
Abstract Preview
Polyploidy, the result of whole genome duplication, is widespread in plants. Over long timescales, polyploids seem to go extinct more often than diploids. Clear genomic signs of long-term polyploid...
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