Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.2c04824
Keywords
anthracnose; Colletotrichum acutatum; tebuconazole; resistance mechanism; CaCYP51 genes
Funding
- Agricultural Science and Technology Projects of Jiangsu province, China [CX (18) 2005, CX [19] 3003, PZCZ201715]
- Chinese Key R D Plans [2016 Y E D 0201007, 2018 Y F D 0201201, 2018YFD0201002]
- China Agriculture System [CARS-24-C-01]
- China Postdoctoral Science Foundation [2022M711400]
- Jiangsu Funding Program for Excellent Postdoctoral Talent [2022ZB767]
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This study first reported that mutations at CaCYP51A and/or overexpression of CaCYP51s conferred resistance to Teb in C. acutatum. CaCYP51A and CaCYP51B are functionally redundant but differentially regulated in DMI resistance.
Colletotrichum acutatum, the main pathogen causing anthracnose on chili worldwide, is controlled by tebuconazole [a sterol C14-demethylation inhibitor (DMI) fungicide, abbreviated as Teb] with excellent efficacy. Our previous study exhibited that all C. acutatum isolates were sensitive to Teb while the Colletotrichum gloeosporioides population had developed resistance to Teb on the same fungicide-pressure selection. Therefore, the assessment of Teb-resistance in C. acutatum is impending. Twenty Tebresistant (Teb) mutants obtained by fungicide domestication and ultraviolet (UV)-mutagenesis displayed similar fitness compared to parental isolates. Data in the current study exhibited that mutations at CaCYP51A and/or overexpression of CaCYP51s were responsible for Teb-resistance. Furthermore, the deletion mutants Delta CaCYP51A and Delta CaCYP51B played different roles in sensitivities to DMIs. Taken together, this study first reported that mutations at CaCYP51A and/or overexpression of CaCYP51s conferred resistance to Teb in C. acutatum, CaCYP51A and CaCYP51B are functionally redundant, but differentially regulated in DMI resistance.
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