PAP3 — Cucumis sativus

Summary

CsPAP3 (CSA_4G615240) on cucumber chromosome 4 encodes a PIF3-like basic helix-loop-helix (bHLH) protein with transcription activator activity, phytochrome binding, and nuclear import signal receptor activity. The gene is associated with positive and negative regulation of the phytochrome signaling pathway, positive regulation of gibberellin biosynthesis and thermomorphogenesis, internode patterning, plastid transcription, and responses to light stimuli, water immersion, and biotic stress. It localizes to plastid RNA polymerase complexes, chloroplast nucleoids, nuclear ubiquitin ligase complexes, and chromatin. CsPAP3 is linked to agronomically important traits including grain yield, fruit quality and set, seed protein content, leaf area, vegetative vigor, light sensitivity, and carotenoid content. Studies of related genes in other species connect the family to shade avoidance, circadian period, and drought stress response.