XA21 — Oryza sativa Japonica

Summary

Os11g0569733, designated Xa21 on rice chromosome 11, encodes a transmembrane receptor serine/threonine kinase with leucine-rich repeats and a plant receptor-like S/T kinase domain. The protein exhibits transmembrane receptor protein serine/threonine kinase activity, signaling receptor activity, and steroid and SNARE binding. Xa21 is associated with bacterial blight resistance, disease resistance, and stress tolerance in rice, with observed links to pathogen response, drought tolerance, and plant growth. It is associated with immune response, detection of brassinosteroid stimulus, regulation of stomatal complex development, and cell growth regulation. The protein localizes to the plasma membrane, ER membrane, and endosome. Xa21 is also associated with grain yield and disease tolerance. Studies of related genes in other species link the family to bacterial leaf blight resistance.