BG1 — Oryza sativa Japonica

Summary

OsBG1 (OS01G0946700) on rice chromosome 1 encodes a glycoside hydrolase family 17 protein with glucan exo-1,3-beta-glucosidase, endo-1,3-beta-D-glucosidase, cellulase, and lichenase activities. The gene is associated with biotic stress and drought responses, as well as the downregulation and regulation of photosynthesis, cytokinin transport, MAPK cascade signaling, stomatal movement, lateral root development, and chlorophyll fluorescence. It has been linked to numerous grain and yield traits including grain weight, grain length, grain number, grain size, amylose content, protein content, panicle length, plant height, and grain filling period, as well as seed size, embryoless seed, brittle culm, and sucrose content. The product localizes to the apoplast, plant-type cell wall, vacuole, secretory vesicle, ER, Golgi, and plasmodesmata. Studies of related genes in other species link the family to plasmodesmal conductivity, callose degradation, and defense responses.