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Control of Citrus Green and Blue Molds by Chinese Propolis
Shuzhen Yang,Litao Peng,Yunjiang Cheng,Siyi Pan,Feng Chen 한국식품과학회 2010 Food Science and Biotechnology Vol.19 No.5
Green and blue molds, caused by Penicillium digitatum and Penicillium italicum, respectively, are economically important postharvest diseases of citrus fruits. In this study, Chinese propolis ethyl acetate extract (PEAE) was evaluated to control P. digitatum and P. italicum on postharvest citrus fruits. The results indicated PEAE strongly inhibited mycelia growth and induced hyphae prominent abnormal morphological alterations. Also, PEAE had strong detrimental effect on spore germination of the tested pathogens in a concentrationdependent manner. For in vivo tests, PEAE could both reduce decay caused by P. digitatum and P. italicum respectively in wound-inoculated fruit and naturally infected fruit; meanwhile, no negative influences on the overall quality of the citrus fruits were observed with PEAE treatment. Therefore, PEAE could be used as a natural antifungal agent to control citrus blue and green mold.
Antifungal Activity and Action Mode of Pinocembrin from Propolis against Penicillium italicum
Litao Peng,Shuzhen Yang,Yunjiang Cheng,Feng Chen,Siyi Pan,Gang Fan 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.6
The antifungal activity and possible mode of action of pinocembrin isolated from propolis against Penicillium italicum were investigated. Pinocembrin exhibited strong antifungal activity against P. italicum in a dosedependent manner. Respiration rates of P. italicum during spore germination and mycelial growth were significantly inhibited when exposure to pinocembrin. The respirations of mitochondria in state 2 and state 3 from mycelia were significantly inhibited in the presence of this compound. The phosphorylated adenosine nucleotides levels in hyphae of P. italicum treated with pinocembrin were significantly low and energy charge value became unstable. Unltrastructure of hyphae was seriously damaged with pinocembrin incubation for 24 h, which was further confirmed by the increase of relative ionic leakage and soluble protein loss of P. italicum mycelia treated with pinocembrin. It was concluded that pinocembrin inhibited the mycelial growth of P. italicum by interfering energy homeostasis and cell membrane damage of the pathogen. Pinocembrin would be a promising bioactive compound for treatment of P. italicum infections on postharvest citrus fruit.