. "\"Any process in which callose is transported to, and/or maintained in, a specific location during the defense response. Callose is a linear 1,3-beta-d-glucan formed from UDP-glucose and is found in certain plant cell walls.\" [GOC:mtg_pamgo_17jul06]" . . "defense response by callose deposition" . . . "callose deposition during defense response" . "callose localization during defense response" .