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Geographical distribution and molecular insights into abamectin and milbemectin cross-resistance in European field populations of Tetranychus urticae

Wenxin Xue (UGent) , Simon Snoeck, Christine Njiru (UGent) , Emre Inak (UGent) , Wannes Dermauw (UGent) and Thomas Van Leeuwen (UGent)
(2020) PEST MANAGEMENT SCIENCE. 76(8). p.2569-2581
Author
Organization
Project
  • POLYADAPT (Molecular-genetic mechanisms of extreme adaptation in a polyphagous agricultural pest)
  • SuperPests (Innovative tools for rational control of the most difficult-to-manage pests (super pests) and the diseases they transmit)
Abstract
BACKGROUND Milbemectin and abamectin are frequently used to control the spider mite Tetranychus urticae. The development of abamectin resistance in this major pest has become an increasing problem worldwide, potentially compromising the use of milbemectin. In this study, a large collection of European field populations was screened for milbemectin and abamectin resistance, and both target-site and metabolic (cross-)resistance mechanisms were investigated. RESULTS High to very high levels of abamectin resistance were found in one third of all populations, while milbemectin resistance levels were low for most populations. The occurrence of well-known target-site resistance mutations in glutamate-gated chloride channels (G314D in GluCl1 and G326E in GluCl3) was documented in the most resistant populations. However, a new mutation, I321T in GluCl3, was also uncovered in three resistant populations, while a V327G and L329F mutation was found in GluCl3 of one resistant population. A differential gene-expression analysis revealed the overexpression of detoxification genes, more specifically cytochrome P450 monooxygenase (P450) and UDP-glycosyltransferase (UGT) genes. Multiple UGTs were functionally expressed, and their capability to glycosylate abamectin and milbemectin, was tested and confirmed. CONCLUSIONS We found a clear correlation between abamectin and milbemectin resistance in European T. urticae populations, but as milbemectin resistance levels were low, the observed cross-resistance is probably not of operational importance. The presence of target-site resistance mutations in GluCl genes was confirmed in most but not all resistant populations. Gene-expression analysis and functional characterization of P450s and UGTs suggests that also metabolic abamectin resistance mechanisms are common in European T. urticae populations.
Keywords
ivermectin, macrocyclic lactone, UGTs, P450s, molecular diagnostics, transcriptomics, 2-SPOTTED SPIDER-MITE, GATED CHLORIDE CHANNEL, INSECTICIDE RESISTANCE, ACARICIDE RESISTANCE, KOCH ACARI, PESTICIDE RESISTANCE, TRANSMEMBRANE REGION, AVERMECTINS, MUTATIONS, MECHANISMS

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Citation

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MLA
Xue, Wenxin, et al. “Geographical Distribution and Molecular Insights into Abamectin and Milbemectin Cross-Resistance in European Field Populations of Tetranychus Urticae.” PEST MANAGEMENT SCIENCE, vol. 76, no. 8, 2020, pp. 2569–81, doi:10.1002/ps.5831.
APA
Xue, W., Snoeck, S., Njiru, C., Inak, E., Dermauw, W., & Van Leeuwen, T. (2020). Geographical distribution and molecular insights into abamectin and milbemectin cross-resistance in European field populations of Tetranychus urticae. PEST MANAGEMENT SCIENCE, 76(8), 2569–2581. https://doi.org/10.1002/ps.5831
Chicago author-date
Xue, Wenxin, Simon Snoeck, Christine Njiru, Emre Inak, Wannes Dermauw, and Thomas Van Leeuwen. 2020. “Geographical Distribution and Molecular Insights into Abamectin and Milbemectin Cross-Resistance in European Field Populations of Tetranychus Urticae.” PEST MANAGEMENT SCIENCE 76 (8): 2569–81. https://doi.org/10.1002/ps.5831.
Chicago author-date (all authors)
Xue, Wenxin, Simon Snoeck, Christine Njiru, Emre Inak, Wannes Dermauw, and Thomas Van Leeuwen. 2020. “Geographical Distribution and Molecular Insights into Abamectin and Milbemectin Cross-Resistance in European Field Populations of Tetranychus Urticae.” PEST MANAGEMENT SCIENCE 76 (8): 2569–2581. doi:10.1002/ps.5831.
Vancouver
1.
Xue W, Snoeck S, Njiru C, Inak E, Dermauw W, Van Leeuwen T. Geographical distribution and molecular insights into abamectin and milbemectin cross-resistance in European field populations of Tetranychus urticae. PEST MANAGEMENT SCIENCE. 2020;76(8):2569–81.
IEEE
[1]
W. Xue, S. Snoeck, C. Njiru, E. Inak, W. Dermauw, and T. Van Leeuwen, “Geographical distribution and molecular insights into abamectin and milbemectin cross-resistance in European field populations of Tetranychus urticae,” PEST MANAGEMENT SCIENCE, vol. 76, no. 8, pp. 2569–2581, 2020.
@article{8666967,
  abstract     = {{BACKGROUND Milbemectin and abamectin are frequently used to control the spider mite Tetranychus urticae. The development of abamectin resistance in this major pest has become an increasing problem worldwide, potentially compromising the use of milbemectin. In this study, a large collection of European field populations was screened for milbemectin and abamectin resistance, and both target-site and metabolic (cross-)resistance mechanisms were investigated.
RESULTS High to very high levels of abamectin resistance were found in one third of all populations, while milbemectin resistance levels were low for most populations. The occurrence of well-known target-site resistance mutations in glutamate-gated chloride channels (G314D in GluCl1 and G326E in GluCl3) was documented in the most resistant populations. However, a new mutation, I321T in GluCl3, was also uncovered in three resistant populations, while a V327G and L329F mutation was found in GluCl3 of one resistant population. A differential gene-expression analysis revealed the overexpression of detoxification genes, more specifically cytochrome P450 monooxygenase (P450) and UDP-glycosyltransferase (UGT) genes. Multiple UGTs were functionally expressed, and their capability to glycosylate abamectin and milbemectin, was tested and confirmed.
CONCLUSIONS We found a clear correlation between abamectin and milbemectin resistance in European T. urticae populations, but as milbemectin resistance levels were low, the observed cross-resistance is probably not of operational importance. The presence of target-site resistance mutations in GluCl genes was confirmed in most but not all resistant populations. Gene-expression analysis and functional characterization of P450s and UGTs suggests that also metabolic abamectin resistance mechanisms are common in European T. urticae populations.}},
  author       = {{Xue, Wenxin and Snoeck, Simon and Njiru, Christine and Inak, Emre and Dermauw, Wannes and Van Leeuwen, Thomas}},
  issn         = {{1526-498X}},
  journal      = {{PEST MANAGEMENT SCIENCE}},
  keywords     = {{ivermectin,macrocyclic lactone,UGTs,P450s,molecular diagnostics,transcriptomics,2-SPOTTED SPIDER-MITE,GATED CHLORIDE CHANNEL,INSECTICIDE RESISTANCE,ACARICIDE RESISTANCE,KOCH ACARI,PESTICIDE RESISTANCE,TRANSMEMBRANE REGION,AVERMECTINS,MUTATIONS,MECHANISMS}},
  language     = {{eng}},
  number       = {{8}},
  pages        = {{2569--2581}},
  title        = {{Geographical distribution and molecular insights into abamectin and milbemectin cross-resistance in European field populations of Tetranychus urticae}},
  url          = {{http://dx.doi.org/10.1002/ps.5831}},
  volume       = {{76}},
  year         = {{2020}},
}

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