RR4 — Medicago truncatula

Summary

MTR_5G036480 (MtRR4) encodes a response regulator protein with histidine phosphotransfer kinase, phosphorelay response regulator, and red/far-red light photoreceptor activities, and belongs to the ARR-like family. It is associated with cytokinin-mediated signalling, nitrogen fixation, circadian regulation, abscisic acid metabolism, and responses to red light, hydrogen peroxide, and photoacclimation. The gene has been linked to traits including yield, biomass, photosynthetic ability, leaf angle, root phototropism, iron and cadmium content, phosphorus uptake, and sensitivities to glyphosate, nitrate, jasmonic acid, and UV-B light. It localises to the nucleus, cytosol, plastid, plasmalemma, and plasmodesmata. Related genes in other species are associated with elongated petioles, altered cytokinin sensitivity, red light hypersensitivity, and circadian period changes.