Moreover, based on the knowledge about the variability of the AGP structure during the ripening process, mainly the carbohydrate chains, an attempt was made to examine whether changes in the glycan content affect the growth of the Penicillium. Both, our previous observations of the cellular distribution of AGPs in fruit undergoing fungal infection and the current study allow concluding that the interactions between all cell wall constituents are responsible for crucial changes in the cell wall assembly during a pathogen attack. The gene discussed is AGPS; the disease is fungal infectious disease.