Hd2 — Oryza sativa Japonica

Summary

Rice gene Hd2 (PRR37) on chromosome 7 encodes a DNA-binding transcription factor with an ARR-like receiver domain, a CCT domain, and a CheY-like superfamily domain. It is associated with circadian rhythm, photoperiodism, and flowering time, including downregulation of long-day flowering, as well as red/far-red light phototransduction, cytokinin signaling, histidyl-aspartyl phosphorelay, and innate immunity. The protein localises to the nucleus. Hd2 is associated with days to heading, anthesis time, grain number, grain yield, panicle length, plant height, and spikelet number per panicle. Related genes in other species link the CCT domain-containing protein group to photoperiodic flowering control.