DNA test predicts seedless muscadines at 99.7% accuracy
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- Worthington's team validated KASP genetic markers that predicted flower sex with 100% accuracy and seedlessness with 99.7% accuracy across more than 1,100 grape samples, including over 900 Vitis–Muscadinia hybrids from the Arkansas program and roughly 200 cultivated and wild grapes.
- The diagnostic markers let breeders screen seedlings years before vines bear fruit — the Arkansas program has been culling seedlings this way since 2024 and is now in its third year of applied use, according to Worthington.
- Crossing muscadines with Vitis vinifera is inherently difficult because the two are in different grape subgenera — "like a horse and a donkey," per Worthington — and crosses between them often yield sterile offspring.
- The publicly available markers cut the number of plants needing field evaluation roughly in half, freeing resources for more crosses and deeper testing of promising candidates, though the markers don't predict flavor, skin thickness, or productivity.
- Commercial seedless muscadines are already on the market: Gardens Alive!'s Jeff Bloodworth developed RazzMatazz in 2017, followed by Oh My! in 2022, which is also powdery-mildew resistant.
- The study, published in the Journal of the American Society for Horticultural Sciences, was a collaboration with Cornell University, the U.S. Department of Agriculture, Gardens Alive!, and E&J Gallo Winery, with graduate student Isabella Vaughn as first author.
Why it matters: For muscadine breeders, the markers shift the bottleneck from waiting years to see if a vine bears seedless fruit to a leaf-sample DNA test at the seedling stage, roughly halving the plants they need to grow out for field evaluation. The publicly available markers give the global grape-breeding community the same predictive tool, accelerating the path to seedless, self-pollinating varieties that could expand muscadine consumption beyond the U.S. South.
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