Abstract

This work aims to produce and purify antifungal lipopeptides from fermentation by B. amyloliquefaciens MG3, and verify antifungal mechanism on C. gloeosporioides. Using Quadrupole-Time of Flight Mass Spectrometry (Q-TOF-MS) analysis, the component with antifungal activity in the fermentation supernatant of the MG3 strain was determined to be the lipopeptide antibiotic iturin A (C14-C15). Antagonistic tests showed that iturin A could inhibit the mycelia growth and spore germination of C. gloeosporioides. The minimal inhibitory concentration (MIC), half maximal inhibitory concentration (IC50) and minimal fungicidal concentration (MFC) of iturin A against C. gloeosporioides were 36.47, 74.95 and 110 μg/mL, respectively. Iturin A induced an increase of cell membrane permeability and MDA content and a decrease of protein content in the fungal cell. It was observed that iturin A treatment resulted in smaller C. gloeosporioides lesion diameters on loquat fruit compared with the control group. Overall, the results of this study show that iturin A from B. amyloliquefaciens MG3 may be a potential biological control agent for postharvest preservation of loquat fruit.

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