HY3 — Cucumis sativus

Summary

CsHY3 (CSA_7G031720) on cucumber chromosome 7 encodes a phytochrome family member, containing phytochrome, GAF, PAS, and histidine kinase domains, and is associated with tetrapyrrole binding. This gene is linked to regulation of responses to red and far-red light, detection of light, and positive regulation of the phytochrome signaling pathway. It has been connected to numerous agronomically important traits including grain yield, panicle number, flower diameter, fruit set, leaf area, plant dry weight, vegetative vigor, photoperiod sensitivity, far-red and blue light sensitivity, chlorophyll ratio, and copper and glyphosate sensitivity. CsHY3 is also associated with phenotypes such as delayed flowering, hypocotyl elongation, shoot regeneration, anthocyanin synthesis, cold and drought stress responses, disease resistance, and carbon assimilation. Studies of related genes in other species link the family to fruit ripening, tuberization, senescence, and biotic and abiotic stress tolerance.