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Penicillium digitatum  is a widespread pathogen among Rutaceae species that causes severe fruit decay symptoms on infected citrus fruit (known as citrus green mold). The employment of fungicides can effectively control the citrus green mold, significantly reducing agricultural economic loss. In this study, we found that the X33 antifungal extract produced by  Streptomyces lavendulae  strain X33 inhibited the hyphae polarization of  P. digitatum . Additionally, physiological and proteomic analysis strategies were applied to explore the inhibitory mechanism of the X33 antifungal extract of the  S. lavendulae  strain X33 on the mycelial growth of  P. digitatum . A total of 277 differentially expressed proteins, consisting of 207 upregulated and 70 downregulated, were identified from the comparative proteomics analysis. The results indicated that the X33 antifungal extract induced mitochondrial membrane dysfunction and cellular integrity impairment, which can affect energy metabolism, oxidative stress, and transmembrane transport. The improved alkaline phosphatase activity and extracellular conductivity, increased H 2 O 2  and malondialdehyde contents, and inhibition of energy, amino acid, and sugar metabolism indicated that the oxidative stress of  P. digitatum  is induced by the X33 antifungal extract. These findings provided insight into the antifungal mechanism of the X33 antifungal extract against  P. digitatum  by suggesting that it may be an effective fungicide for controlling citrus postharvest green mold.

Physiological and Proteomic Analysis of Penicillium digitatum in Response to X33 Antifungal Extract Treatment