Callose

Its production is due to the glucan synthase-like gene (GLS) in various places within a plant.It is produced to act as a temporary cell wall in response to stimuli such as stress or damage.Callose is produced in response to wounding, infection by pathogens,[3] aluminium, and abscisic acid.When there is wounding in the plant tissue, it is fixed by the deposition of callose at the plasmodesmata and cell wall; this process happens within minutes after damage.[5] Callose also forms immediately around the developing meiocytes and tetrads of sexually reproducing angiosperms but is not found in related apomictic taxa.
CAS NumberChemical formulastandard statepolysaccharideglucoseβ-glucancell wallglucanasesplasmodesmatacell platecytokinesispollenaluminiumabscisic acidsieve platesmeiocytesangiospermsapomicticdifferentiatenucellar embryosNucellar embryonyCurdlan