Abstract
Dickeya zeae is a globally important bacterial pathogen that has been reported to cause severe soft rot diseases in several essential food crops, including bananas, rice, maize, and potatoes. Carvacrol, a hydrophobic terpene component, is found in aromatic plants of the Labiatae family and various essential oils. However, little work has been done on its antimicrobial potential against D. zeae. This study aimed to evaluate the antimicrobial activity and the functional mechanism of carvacrol against D. zeae. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of carvacrol against D. zeae were 0.1 mg/mL and 0.2 mg/mL, respectively. Carvacrol affected the cell membrane of D. zeae, as revealed by decreased intracellular ATP concentration, nucleic acid leakage, and decreased membrane potential. Scanning electron microscopy (SEM) micrographs confirmed that D. zeae cell membranes were damaged by carvacrol. Furthermore, a significant inhibition of D. zeae swimming motility and biofilm formation was observed following treatments with carvacrol at sub-inhibitory concentrations, indicating a significantly negative effect on these virulence factors. Accordingly, the tissue infection test revealed that carvacrol significantly reduced the pathogenicity of D. zeae. In a pot experiment, inoculated banana seedlings displayed remarkably lesser disease symptoms following treatment with carvacrol, and the control efficiency for banana soft rot was 32.0% at 14 days post-inoculation. To summarize, carvacrol exhibits strong antimicrobial activity against D. zeae and great potential applications in the control of D. zeae-associated crop diseases.
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This research was supported by Grants from the Natural Science Foundation of Guangdong province (2015A030312002), the Science and Technology Project of Guangzhou city (201704030120), National Natural Science Foundation of China (31300118), Science and Technology Project of Guangdong province (2016B020202003), and the Special fund for scientific innovation strategy-construction of high level Academy of Agriculture Science (R2017PY-QY004, R2018QD-056).
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BL conceived and designed the experiments; SJ conducted the experiments and wrote the manuscript; JZ designed the experiments and revised the paper; ZW and QL designed the experiments; DS provided materials; QY, HS, and XP analyzed the data.
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This research was supported by Grants from the Natural Science Foundation of Guangdong province (2015A030312002), the Science and Technology Project of Guangzhou city (201704030120), National Natural Science Foundation of China (31300118), Science and Technology Project of Guangdong province (2016B020202003), and the Special fund for scientific innovation strategy-construction of high level Academy of Agriculture Science (R2017PY-QY004, R2018QD-056).
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Jiang, S., Zhang, J., Yang, Q. et al. Antimicrobial Activity of Natural Plant Compound Carvacrol Against Soft Rot Disease Agent Dickeya zeae. Curr Microbiol 78, 3453–3463 (2021). https://doi.org/10.1007/s00284-021-02609-3
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DOI: https://doi.org/10.1007/s00284-021-02609-3