HY3 — Daucus carota subsp. sativus

Summary

DCAR_030471 (HY3, also known as PHYB) on carrot chromosome 9 encodes a protein with PAS, GAF, and histidine kinase domains, and is associated with tetrapyrrole binding. In carrot, this gene is linked to the regulation of responses to red and far-red light, detection of light, and the positive regulation of phytochrome signaling. It is connected to the conversion of active and inactive PHYB forms and its translocation from the cytosol to the nucleoplasm. Associations include traits such as photoperiod sensitivity, far-red and blue light sensitivity, chlorophyll ratio, flower diameter, grain yield, and vegetative vigor. The gene is also linked to phenotypes including delayed flowering, drought stress response, cold stress response, and disease resistance. Related genes in other species are associated with fruit ripening, carotenoid accumulation, senescence, and biotic stress resistance.