MYB3 — Oryza sativa Japonica

Summary

OsMYB3 (also known as MYB3, OsMYB42, and OsMYB99) on rice chromosome 1 encodes a plant R2R3-MYB transcription factor with DNA-binding and protein phosphatase activity. It is localized to the nucleus and is associated with the regulation of secondary growth, secondary cell wall biogenesis, cellulose and lignin anabolism, phenylpropanoid metabolism, and the shikimate pathway. The gene has been linked to pigment accumulation, seed maturation, shoot development, and responses to iron starvation and phosphate homeostasis. Agronomically, OsMYB3 is associated with grain number and size, leaf angle and shape, hull color, flowering time, heat and cold tolerance, salt and osmotic stress responses, disease tolerance, root morphology, and anthocyanin content. Studies of related genes in other species link the family to flavonol and phenylpropanoid biosynthesis, abiotic stress responses, and Verticillium wilt resistance.