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Njiru C, Saalwaechter C, Mavridis K, Vontas J, Geibel S, Wybouw N, Van Leeuwen T. The complex II resistance mutation H258Y in succinate dehydrogenase subunit B causes fitness penalties associated with mitochondrial respiratory deficiency. PEST MANAGEMENT SCIENCE 2023; 79:4403-4413. [PMID: 37394630 DOI: 10.1002/ps.7640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 05/31/2023] [Accepted: 07/03/2023] [Indexed: 07/04/2023]
Abstract
BACKGROUND The acaricides cyflumetofen, cyenopyrafen and pyflubumide inhibit the mitochondrial electron transport chain at complex II [succinate dehydrogenase (SDH) complex]. A target site mutation H258Y was recently discovered in a resistant strain of the spider mite pest Tetranychus urticae. H258Y causes strong cross-resistance between cyenopyrafen and pyflubumide, but not cyflumetofen. In fungal pests, fitness costs associated with substitutions at the corresponding H258 position that confer resistance to fungicidal SDH inhibitors have not been uncovered. Here, we used H258 and Y258 near-isogenic lines of T. urticae to quantify potential pleiotropic fitness effects on mite physiology. RESULTS The H258Y mutation was not associated with consistent significant changes of single generation life history traits and fertility life table parameters. In contrast, proportional Sanger sequencing and droplet digital polymerase chain reaction showed that the frequency of the resistant Y258 allele decreased when replicated 50:50 Y258:H258 experimentally evolving populations were maintained in an acaricide-free environment for approximately 12 generations. Using in vitro assays with mitochondrial extracts from resistant (Y258) and susceptible (H258) lines, we identified a significantly reduced SDH activity (48% lower activity) and a slightly enhanced combined complex I and III activity (18% higher activity) in the Y258 lines. CONCLUSION Our findings suggest that the H258Y mutation is associated with a high fitness cost in the spider mite T. urticae. Importantly, while it is the most common approach, it is clear that only comparing life history traits and life table fecundity does not allow to reliably estimate fitness costs of target site mutations in natural pest populations. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Christine Njiru
- Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | | | - Konstantinos Mavridis
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Heraklion, Greece
- Pesticide Science Laboratory, Department of Crop Science, Agricultural University of Athens, Athens, Greece
| | - John Vontas
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Heraklion, Greece
- Pesticide Science Laboratory, Department of Crop Science, Agricultural University of Athens, Athens, Greece
| | - Sven Geibel
- Crop Science Division, Bayer AG, Monheim, Germany
| | - Nicky Wybouw
- Terrestrial Ecology Unit, Department of Biology, Faculty of Science, Ghent University, Ghent, Belgium
| | - Thomas Van Leeuwen
- Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
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Tadatsu M, Sakashita R, Panteleri R, Douris V, Vontas J, Shimotsuma Y, Ishida T, Sudo M, Van Leeuwen T, Osakabe M. A mutation in chitin synthase I associated with etoxazole resistance in the citrus red mite Panonychus citri (Acari: Tetranychidae) and its uneven geographical distribution in Japan. PEST MANAGEMENT SCIENCE 2022; 78:4028-4036. [PMID: 35639971 DOI: 10.1002/ps.7021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 05/27/2022] [Accepted: 05/31/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND High-levels of etoxazole resistance have not yet been frequently reported in Panonychus citri. Although a highly resistant strain was discovered in 2014, etoxazole resistance has not become a significant problem in areas of citrus production in Japan. A target site mutation in chitin synthase 1 (CHS1), I1017F, is a major etoxazole-resistance factor in Tetranychus urticae. To investigate the mechanisms of etoxazole resistance and the dispersal of resistance genes, we analyzed target-site mutations in a highly resistant strain and their geographical distribution in Japan. RESULTS High-level etoxazole resistance was completely recessive. The I1017F mutation was detected in CHS1 of the highly resistant strain, and its frequency was correlated with the hatchability of eggs treated with etoxazole. Sequencing and variant frequency analyses of local populations by quantitative polymerase chain reaction revealed that I1017F is restricted to the Ariake Sea area of Kyushu Island. Although a new nonsynonymous substitution, S1016L, accompanied by I1017F was found in CHS1 of the highly resistant strain, CRISPR/Cas9 engineering of flies showed that S1016L had no effect on the etoxazole resistance conferred by I1017F. CONCLUSION I1017F is a major target site mutation that confers high-level etoxazole resistance on P. citri. Dispersion of I1017F possibly was suppressed as a result of the completely recessive inheritance of resistance together with low gene flow between local populations. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Misono Tadatsu
- Laboratory of Ecological Information, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Ryota Sakashita
- Laboratory of Ecological Information, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Rafaela Panteleri
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology Hellas, Crete, Greece
- Laboratory of Molecular Entomology, Department of Biology, University of Crete, Crete, Greece
| | - Vassilis Douris
- Department of Biological Applications and Technology, University of Ioannina and Institute of Biosciences, University Research Center of Ioannina, Ioannina, Greece
- Biomedical Research Institute, Foundation for Research and Technology Hellas, Ioannina, Greece
| | - John Vontas
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology Hellas, Crete, Greece
- Department of Crop Science, Agricultural University of Athens, Athens, Greece
| | - Yushi Shimotsuma
- Agro-Science Research Center, Kyoyu Agri Co., Ltd., Nagano, Japan
| | - Tatsuya Ishida
- Agro-Science Research Center, Kyoyu Agri Co., Ltd., Nagano, Japan
| | - Masaaki Sudo
- Division of Fruit Tree and Tea Pest Control Research, Institute for Plant Protection, NARO, Kanaya Tea Research Station, Shimada, Japan
| | - Thomas Van Leeuwen
- Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Masahiro Osakabe
- Laboratory of Ecological Information, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
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