One DNA letter change helps watermelon stems outgrow floodwater
Guan X, Wang Y, Xu T, Lei A, Zhang Y
Climate Adaptation
If you've ever watched a garden watermelon or squash vine wilt after a heavy rainstorm flooded the bed, this research points to the exact gene switch that decides whether the plant can stretch above the water or drowns trying.
Watermelon plants hate wet feet, but some varieties handle flooding better than others by rapidly growing their stems taller to escape the water. Researchers compared 122 watermelon varieties and traced this ability to a single letter change in the DNA near a gene called ClPrx53, which works together with a growth-regulating protein to control how fast the stem elongates when flooded. This discovery gives breeders a precise genetic marker to develop watermelon varieties that survive flash floods and waterlogged fields.
Key Findings
A genome-wide association study of 122 watermelon accessions identified ClPrx53, a class III peroxidase gene, as a positive regulator of waterlogging-induced shoot elongation.
A single G-to-T SNP in the ClPrx53 promoter boosts its transcriptional activity and explains natural variation in waterlogging tolerance among watermelon varieties.
The SNP changes how strongly the DELLA protein ClGAI-LIKE binds the ClPrx53 promoter, linking gibberellin (GA) hormone signaling to reactive oxygen species control and stem escape growth.
chevron_right Technical Summary
Scientists found a gene switch in watermelon that lets it quickly stretch its stems above floodwater, and a single tiny DNA change controls how well different watermelon varieties can do this, opening a path to breed flood-tolerant crops.
Abstract Preview
Original paper
ClGAI-LIKE-ClPrx53 module regulates waterlogging-induced shoot elongation in watermelon.
Waterlogging is a major abiotic stress that severely constrains plant growth and development. While studies on waterlogging tolerance have predominantly focused on wetland plants, the molecular ada...
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The watermelon is a species of flowering plant in the family Cucurbitaceae, that has a large, edible fruit. It is a scrambling and trailing vine-like plant, and is widely cultivated worldwide, with more than 1,000 varieties.