PAP3 — Cucumis sativus

Summary

CsPAP3 (CSA_3G622450) on cucumber chromosome 3 encodes a PIF3-like basic helix-loop-helix (bHLH) protein with DNA-binding transcription activator activity, phytochrome binding, and nuclear import signal receptor activity. It is associated with positive and negative regulation of phytochrome signaling, thermomorphogenesis, seed maturation, photosynthesis light reaction, and responses to far-red and red light stimuli. The gene has been connected to numerous agronomic traits including grain yield, fruit quality and set, flower diameter, leaf area, vegetative vigor, root system morphology, carotenoid content, chlorophyll ratio, seedling greening, drought stress tolerance, and responses to UV-A/B light, submergence, nematodes, glyphosate, and salinity. It localizes to plastid RNA polymerase complex, chloroplast nucleoid, nuclear ubiquitin ligase complex, chromatin, and cell wall. Studies of related genes in other species link the family to fruit ripening, lycopene content, cold tolerance, shade avoidance, and circadian regulation.