HY3 — Daucus carota subsp. sativus

Summary

DcHY3 (DCAR_003036) on carrot chromosome 1 encodes a protein with a histidine kinase domain, GAF and PAS folds, and tetrapyrrole binding activity. The gene is associated with detection of light, regulation of response to red or far red light, positive regulation of phytochrome signaling, and protein-phycocyanobilin linkage. It is linked to numerous agronomic traits including grain yield, panicle number, flower diameter, leaf area, root system morphology, fruit set, vegetative vigor, plant dry weight, subterranean shoot axis tuber size, photoperiod sensitivity, and responses to far red, blue and continuous light. Associations also include chlorophyll ratio, phenolic compound content, copper and glyphosate sensitivity, hybrid incompatibility, and traits related to shoot regeneration, anthocyanin synthesis, nitrogen and phosphorus utilization, cold and drought stress responses, disease resistance, and heat shock tolerance. Related genes in other species are associated with tuberization, fruit ripening, carotenoid accumulation, senescence, and biotic and abiotic stress resistance.