Researchers Elucidate the Molecular Mechanism of Cold Tolerance in Pepper

Scientists from the Northwest A&F University have uncovered the molecular pathway that aids pepper plants in fighting off cold stress that normally disrupts cellular balance and causes harmful oxidative damage. By showing how the enzyme CaSNF1 works with the CaHD-ZIP inside the cell nucleus, a protective switch that could help breeders grow hardier crops in colder climates was unlocked.

Molecular and cellular assays revealed that the protein CaHD-ZIP directly interacts with and is activated by the enzyme CaSNF1 within the cell nucleus. Additionally, the suppression of the CaSNF1 activity increased cold sensitivity, weakened antioxidant defenses, and lowered the activation of cold-defense genes in pepper. Conversely, cellular damage is reduced, and cold survival is significantly improved when CaSNF1 is overexpressed.

These findings demonstrate how the SNF1–CaHD-ZIP team works together to protect pepper plants from freezing temperatures. Identifying this protein pair provides scientists with a roadmap and a clear target for breeding peppers that can thrive amidst cold stress.

Learn more by reading the full study in Theoretical and Applied Genetics.