Scientists turned red lettuce green and something surprising happened
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- University of Tsukuba researchers used CRISPR/Cas9 to knock out the DFR gene in red leaf lettuce, eliminating its characteristic red anthocyanin pigmentation.
- The modified lettuce accumulated higher levels of other flavonoids, including quercetin, as the blocked anthocyanin pathway redirected biochemical precursors.
- The genome-edited plants showed no meaningful reduction in growth despite the significant shift in pigment and flavonoid composition.
- Ai Nagamine, Masaki Ono, Osuke Sato, Eiji Goto, and Hiroshi Ezura published the findings in Frontiers in Genome Editing (2026, DOI: 10.3389/fgeud.2026.1755922).
- The research team identified indoor plant factories as a promising deployment setting, since flavonoid production is highly sensitive to light intensity and temperature — factors that can be tightly controlled indoors.
- The work was funded by the Japan Science and Technology Agency's JSTOPERA program (JPMJOP1851).
Why it matters: Red lettuce already commands premium interest for its polyphenol content, and the demonstration that breeders can reroute its flavonoid pathway toward quercetin with no growth tradeoff gives plant scientists a concrete tool to engineer nutrient-dense varieties — particularly for controlled indoor farming systems.
