Callosin is involved in plant cell biology, particularly in the formation and regulation of callose, a polysaccharide that plays a critical role in plant defense and development. It is applied in agricultural research to study plant responses to stress, pathogens, and wounding. By modulating callose deposition at cell walls, callosin helps scientists understand mechanisms of cellular sealing, pollen development, and plasmodesmatal regulation. Its function is leveraged in developing resilient crop varieties with enhanced pathogen resistance and improved reproductive success under environmental stress.