Researchers studying plant roots found a molecular on-off switch that responds to nitric oxide, a signaling gas. A protein called PERIANTHIA can be chemically tagged by the gas, which stops it from binding DNA. Another protein removes the tag, turning the switch back on and letting root stem cells keep working.
Roots decide how deep and wide a plant grows, which shapes water use and crop yields. Knowing the exact gas-sensing mechanism behind root stem cell maintenance gives plant breeders a specific target when developing crops with stronger, more efficient root systems.
✦ A root's shape may trace back to one gas-sensitive protein switch.