PAP3 (BJUB04G28560S) — Brassica juncea

Summary

BJUB04G28560S (BjPAP3, also known as BjPIF3) on chromosome B04 encodes a PIF3-like basic helix-loop-helix transcription regulator with phytochrome-binding, nuclear import signal receptor, and red/far-red light photoreceptor activities. It is associated with positive regulation of phytochrome signaling, seed maturation, thermomorphogenesis, and gibberellin biosynthesis, as well as regulation of auxin biosynthesis and photosynthesis light reactions. The gene has been connected to numerous agronomic traits including grain yield, flower diameter, fruit set, leaf angle, leaf area, vegetative vigor, photoperiod sensitivity, seed set percent, and responses to light quality, UV-A, far-red, and blue light. It localizes to plastids, chloroplast nucleoids, nuclear speckles, and the cell wall. Studies of related genes in other species link the family to shade avoidance, circadian clock regulation, drought stress response, and defense signaling.