The research goal of our work was to determine the effects of NaHCO3 on pathogenicity of P. expansum, the causal organism of penicilliosis and patulin producing. Firstly, P. expasum was isolated from naturally infected pear fruits, and its genetic background was determined by rDNA-ITS (rDNA-internal transcribed spacer) analysis. Then, physiological and biochemical assays were carried out in order to determine the effects of NaHCO3 on development and pathogenicity of P. expansum. Further, the expression of four genes involved in patulin biosynthesis was evaluated by quantitative realtime
PCR (qRT-PCR) analysis. The results will provide novel insights into exploring the potential of NaHCO3 to control postharvest horticulture pathogens of fruit and vegetable