ARF — Medicago truncatula

Summary

MTR_4G077640, designated MtARFB1B, encodes a small GTPase of the ARF family, possessing GTPase, GTP-binding, protein kinase, and blue light photoreceptor activities, along with phospholipase activator and FMN-binding functions. The gene is associated with diverse biological processes including chloroplast accumulation and avoidance movements, blue light signaling, lateral root development, nodulation, auxin signaling, circadian rhythm, organogenesis, geotropism, vesicle and protein transport, regulation of proton transport and stomatal movement, and protein breakdown. It localizes to the Golgi complex, cytoplasm, nucleus, plant-type vacuole, and internal side of the plasma membrane. MtARFB1B is linked to agronomically relevant traits such as biomass yield, water use efficiency, root length and mass density, lateral root length, days to flowering, leaf senescence, stomatal resistance, phenolic compound content, and responses to low temperature, light intensity, and viral disease. Related genes in other species are linked to phototropism, chloroplast relocation, stomatal aperture regulation, and lateral root growth.