XA4 — Oryza sativa Japonica

Summary

OsXA4 (also known as XA4 and WAK17) on rice chromosome 11 encodes a transmembrane receptor protein serine/threonine kinase with calcium ion binding, polysaccharide binding, and ATP binding activities, belonging to the wall-associated kinase (WAK) family. The gene is associated with innate immune response signaling, detection of fungal molecules, and positive regulation of the hypersensitive response. It is linked to blast disease resistance, defense responses, and cell wall-related processes, as well as cold tolerance and chlorophyll content. Additional associations include regulation of stomatal complex development, brassinosteroid-mediated signaling, embryo sac development, nodulation, and salinity response activation. The encoded protein localizes to the external side of the plasma membrane. Related genes in other species are linked to disease resistance, growth, root development, and sterility traits.