Abstract
Geotrichum citri-aurantii is the causal agent of citrus sour rot, and the fungicide iminoctadine tris (albesilate) (ITA) is highly effective and thus widely used to control this disease. However, the fungicidal actions of ITA against G. citri-aurantii are still unclear. In the present study, the baseline sensitivity was established based on the distribution of the effective concentration for 50% inhibition (EC50) values and fungicidal actions of ITA were explored. The distribution of EC50 values of ITA against G. citri-aurantii was discontinuous, and the average EC50 value for the 193 sensitive isolates of G. citri-aurantii was 0.0925 ± 0.0554 (SD) mg/L. ITA in potato dextrose agar (PDA) reduced the branching of mycelia. ITA at low concentrations delayed while at high concentrations inhibited germination of arthrospores. Compared with the non-treated control, ITA at 0.12 mg/L disrupted cell membrane integrity of arthrospores, reduced the total content of lipid in mycelia, and significantly increased the content of malondialdehyde (MDA). ITA at 0.12 mg/L increased the content of superoxide anion (O2-) by 38.9% but had no significant effect on the content of hydrogen peroxide (H2O2) in mycelia. ITA increased the activity of superoxide dismutase (SOD) by 131.8% whereas reduced the activity of peroxidase (POD) by 59.7%. These studies will advance our understanding of the fungicidal action of ITA and thus promote the application of this fungicide to control citrus sour rot.
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This work was supported by the China Agriculture Research System of MOF and MARA.
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Kunyu Zhang: Investigation, Data curation. Chaoan Long: Resources. Yanping Fu: Funding acquisition, Supervision. Fuxing Zhu: Methodology, Validation, Conceptualization.
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Zhang, K., Fu, Y., Long, C. et al. Baseline sensitivity and fungicidal action of iminoctadine tris (albesilate) against Geotrichum citri-aurantii. Eur J Plant Pathol 168, 635–647 (2024). https://doi.org/10.1007/s10658-023-02787-9
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DOI: https://doi.org/10.1007/s10658-023-02787-9