Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 68, Issue 34, Pages 9120-9130Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.0c03690
Keywords
Didymella bryoniae; pydiflumetofen; resistance risk; resistance mechanism; SdhB gene
Funding
- National Key Research and Development Program of China [2018YFD0200503]
- National Natural Science Foundation of China [31772191]
- Jiangsu Agriculture Science and Technology Innovation Fund [CX(18)1003]
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Gummy stem blight (GSB), caused by Didymella bryoniae, is a devastating disease on watermelon. Pydiflumetofen belongs to succinate dehydrogenase inhibitor (SDHI) fungicide, which is effective in controlling many plant diseases. The EC50 values of 69 D. bryoniae isolates to pydiflumetofen ranged from 0.0018 to 0.0071 mu g/mL, and the minimal inhibitory concentration (MIC) value of all strains to pydiflumetofen was <0.05 mu g/mL. Eight pydiflumetofen-resistant mutants were obtained, and the level of resistance was stable. The mycelial growth, dry weight of mycelia, hyphal morphology, and pathogenicity of most resistant mutants did not change significantly compared with their parental strains, which indicated that the resistance risk of D. bryoniae to pydiflumetofen would be medium to high. Sequencing alignment showed that five resistant mutants presented a mutation at codon 277 (H277Y) in the SdhB gene. The point mutants FgSdhB(H)(248)(Y/R )exhibited decreased sensitivity to pydiflumetofen in Fusarium graminearum, which indicated that the point mutants of SdhB could reduce sensitivity to pydiflumetofen. These results further increase our understanding about the mode of action and the resistance mechanism of pydiflumetofen.
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