Abstract
Photosensitization is a novel, non-thermal and effective technology to inactivate microorganisms. The inhibitory effect and its mechanism of curcumin-based photosensitization on plant pathogen B. cinerea are investigated in this study. Significant changes have been observed upon photosensitization, which include a reduction of 96.2% in spore germination when spores were mixed with 0.5 mM curcumin and exposed for 5 min, a complete control on lesion enlargement of gray mold in apple fruit after 10 min. Morphological changes, losses of membrane integrity and variations of cell wall polysaccharide deposition in treated B. cinerea cells were observed. Furthermore, after photosensitization, a series of apoptotic characteristics, such as the accumulation of ROS and Ca2+, the decrease of mitochondrial membrane potential (MMP) and nuclear fragmentation were observed. Collectively, these data provided evidence that curcumin-based photosensitization is an effective method to control the plant pathogen B. cinerea.
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