PIF5 (AT3G59060) — Arabidopsis thaliana

Summary

AT3G59060, designated PIF5 (PHYTOCHROME-INTERACTING FACTOR 5) and also known as PIL6 or bHLHb1, encodes a basic helix-loop-helix transcription factor that acts as a DNA-binding transcription activator and binds phytochrome. In Arabidopsis thaliana, PIF5 is associated with the regulation of shade avoidance, morphogenesis, and sleep, and has been linked to auxin signaling, nitrogen stress tolerance, and carbon dioxide response. The gene is connected to numerous traits including stem number, seedling height, flower diameter, fruit set, grain yield, leaf area index, drought recovery, and responses to UV-A and far-red light. Studies of related genes in other species link the family to fruit ripening, lycopene content, cold tolerance, grain yield, and gibberellin response.