PAP3 (CSA_2G035330) — Cucumis sativus

Summary

CsPAP3 (CSA_2G035330) on cucumber chromosome 2 encodes a PIF3-like basic helix-loop-helix transcription regulator with transcription activator activity, phytochrome binding, and nuclear import signal receptor activity. It is associated with positive and negative regulation of phytochrome signaling, thermomorphogenesis, gibberellin biosynthesis, internode patterning, and response to far-red and UV light. The gene is linked to traits including fruit set, fruit quality, grain yield, seed protein content, flower diameter, leaf area, vegetative vigor, root system morphology, photoperiod sensitivity, and stress responses such as drought tolerance, nematode damage, and glyphosate sensitivity. It localizes to plastid RNA polymerase complexes, chloroplast nucleoids, nuclear ubiquitin ligase complexes, and chromatin. Studies of related genes in other species connect the family to fruit ripening, lycopene content, cold tolerance, shade avoidance, and circadian regulation.