HY3 — Cucumis sativus

Summary

CsHY3 (CSA_6G403570) on cucumber chromosome 6 encodes a phytochrome family member, containing phytochrome A-E, PAS, GAF, PHY, and histidine kinase domains, and is associated with tetrapyrrole binding. The gene is linked to regulation of red and far-red light responses, positive regulation of phytochrome signaling, and protein-phycocyanobilin linkage. It has been connected to numerous agronomic traits including grain yield, panicle number, flower diameter, fruit set, leaf area, branch angle, plant dry weight, vegetative vigor, photoperiod sensitivity, and responses to light quality, far-red and blue light. Associations also include chlorophyll ratio, copper and glyphosate sensitivity, phenolic compound content, and traits related to root system morphology, seedling cotyledon size, carpel number, and inflorescence length. Studies of related genes in other species link the family to fruit ripening, tuberization, senescence, and stress tolerance.