- (-) is one of the most important postharvest pathogens leading to a postharvest loss of citrus by causing sour rot. In this study, the antifungal activity of -2-hexenal, a natural component of essential oil, against - was evaluated. -2-hexenal treatment inhibited the mycelia growth of - with a minimum inhibitory concentration and minimum fungicidal concentration of -2-hexenal at 0.50 and 1.00 μL/mL, respectively. Moreover, -2-hexenal efficiently reduced the incidence of sour rot of Satsuma fruit inoculated with -. Ultrastructural observations and Fourier transform infrared (FT-IR) results showed that -2-hexenal treatment affected the cell wall and cell membrane instructions of -. The content of -1,3-glucan was significantly decreased after -2-hexenal treatment, but the cell wall permeability was not changed. The decrease in lipid and ergosterol contents might be responsible for this antifungal activity. Several important genes, , , , and , showed decreasing expression levels after -2-hexenal treatment. Molecule-docking results also indicated that -2-hexenal could join with the protein of FKS1, ERG1, ERG7, and ERG11 to impact enzyme activities. These results demonstrated that -2-hexenal is a promising fungicide for controlling sour rot of harvested citrus fruit by damaging the membrane integrity of -
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| http://dx.doi.org/10.3390/jof9090930 | DOI Listing |
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