학술논문
Triazole resistance in Aspergillus fumigatu s isolated from a tomato production environment exposed to propiconazole.
Document Type
Academic Journal
Author
M Jimenez Madrid A; Department of Plant Pathology, The Ohio State University College of Food, Agricultural and Environmental Sciences-Wooster, Wooster, Ohio, USA.; Paul RA; Department of Plant Pathology, The Ohio State University College of Food, Agricultural and Environmental Sciences-Wooster, Wooster, Ohio, USA.; Rotondo F; Department of Plant Pathology, The Ohio State University College of Food, Agricultural and Environmental Sciences-Wooster, Wooster, Ohio, USA.; Deblais L; Department of Animal Sciences, Center for Food Animal Health, The Ohio State University College of Food, Agricultural and Environmental Sciences-Wooster, Wooster, Ohio, USA.; Rajashekara G; Department of Animal Sciences, Center for Food Animal Health, The Ohio State University College of Food, Agricultural and Environmental Sciences-Wooster, Wooster, Ohio, USA.; Miller SA; Department of Plant Pathology, The Ohio State University College of Food, Agricultural and Environmental Sciences-Wooster, Wooster, Ohio, USA.; Ivey MLL; Department of Plant Pathology, The Ohio State University College of Food, Agricultural and Environmental Sciences-Wooster, Wooster, Ohio, USA.
Source
Publisher: American Society for Microbiology Country of Publication: United States NLM ID: 7605801 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1098-5336 (Electronic) Linking ISSN: 00992240 NLM ISO Abbreviation: Appl Environ Microbiol Subsets: MEDLINE
Subject
Language
English
Abstract
The emergence of azole-resistant Aspergillus fumigatus (AR Af ) across the world is an important public health concern. We sought to determine if propiconazole, a demethylase inhibitor (DMI) fungicide, exerted a selective pressure for AR Af in a tomato production environment following multiple exposures to the fungicide. A tomato field trial was established in 2019 and propiconazole was applied weekly until harvest. Soil, leaf, and fruit (when present) samples were collected at baseline and after each propiconazole application. A. fumigatus isolates ( n , 178) were recovered and 173 were tested for susceptibility to itraconazole, posaconazole, voriconazole, and propiconazole in accordance with CLSI M38 guidelines. All the isolates were susceptible to medical triazoles and the propiconazole MIC ranged from 0.25 to 8 mg/L. A linear regression model was fitted that showed no longitudinal increment in the log 2 -fold azole MIC of the isolates collected after each propiconazole exposure compared to the baseline isolates. AsperGenius real-time multiplex assay ruled out TR34/L98H and TR46/Y121F/T289A cyp 51A resistance markers in these isolates. Sequencing of a subset of isolates ( n , 46) demonstrated widespread presence of F46Y/M172V/E427K and F46Y/M172V/N248T/D255E/E427K cyp 51A mutations previously associated with reduced susceptibility to triazoles.
Importance: The agricultural use of azole fungicides to control plant diseases has been implicated as a major contributor to ARAf infections in humans. Our study did not reveal imposition of selection pressure for ARAf in a vegetable production system. However, more surveillance studies for ARAf in food crop production and other environments are warranted in understanding this public and One Health issue.
Competing Interests: The authors declare no conflict of interest.
Importance: The agricultural use of azole fungicides to control plant diseases has been implicated as a major contributor to ARAf infections in humans. Our study did not reveal imposition of selection pressure for ARAf in a vegetable production system. However, more surveillance studies for ARAf in food crop production and other environments are warranted in understanding this public and One Health issue.
Competing Interests: The authors declare no conflict of interest.