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Bayer CropScience : Investigators from Bayer CropScience Target Pesticides (Geographic spread, genetics and functional characteristics of ryanodine receptor based...

08/27/2015 | 02:48pm US/Eastern

Investigators from Bayer CropScience Target Pesticides (Geographic spread, genetics and functional characteristics of ryanodine receptor based target-site resistance to diamide insecticides in diamondback moth, Plutella xylostella)

By a News Reporter-Staff News Editor at Life Science Weekly -- Data detailed on Pesticides have been presented. According to news originating from Monheim, Germany, by NewsRx correspondents, research stated, "Anthranilic diamides and flubendiamide belong to a new chemical class of insecticides acting as conformation sensitive activators of the insect ryanodine receptor (RyR). These compounds control a diverse range of different herbivorous insects including diamondback moth, Plutella xylostella (Lepidoptera: Plutellidae), a notorious global pest on cruciferous crops, which recently developed resistance due to target-site mutations located in the trans-membrane domain of the Plutella RyR."

Our news journalists obtained a quote from the research from Bayer CropScience, "In the present study we further investigated the genetics and functional implications of a RyR G4946E target-site mutation we recently identified in a Philippine diamondback moth strain (Sudlon). Strain Sudlon is homozygous for the G4946E mutation and has been maintained under laboratory conditions without selection pressure for almost four years, and still exhibit stable resistance ratios of >2000-fold to all commercial diamides. Its F1 progeny resulting from reciprocal crosses with a susceptible strain (BCS-S) revealed no maternal effects and a diamide susceptible phenotype, suggesting an autosomally almost recessive mode of inheritance. Subsequent back-crosses indicate a near monogenic nature of the diamide resistance in strain Sudlon. Radioligand binding studies with Plutella thoracic microsomal membrane preparations provided direct evidence for the dramatic functional implications of the RyR G4946E mutation on both diamide specific binding and its concentration dependent modulation of [H-3]ryanodine binding. Computational modelling based on a cryo-EM structure of rabbit RyR1 suggests that Plutella G4946E is located in trans-membrane helix S4 close to S4-S5 linker domain supposed to be involved in the modulation of the voltage sensor, and another recently described mutation, 14790M in helix S2 approx. 13 angstrom opposite of G4946E. Genotyping by pyrosequencing revealed the presence of the RyR G4946E mutation in larvae collected in 2013/14 in regions of ten different countries where diamide insecticides largely failed to control diamondback moth populations."

According to the news editors, the research concluded: "Thus, our study highlights the global importance of the G4946E RyR target-site mutation, which as a mechanism on its own, confers high-level resistance to diamide insecticides in diamondback moth."

For more information on this research see: Geographic spread, genetics and functional characteristics of ryanodine receptor based target-site resistance to diamide insecticides in diamondback moth, Plutella xylostella. Insect Biochemistry and Molecular Biology, 2015;63():14-22. Insect Biochemistry and Molecular Biology can be contacted at: Pergamon-Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, England. (Elsevier - www.elsevier.com; Insect Biochemistry and Molecular Biology - www.journals.elsevier.com/insect-biochemistry-and-molecular-biology/)

The news correspondents report that additional information may be obtained from D. Steinbach, Bayer CropSci AG, R&D, Res Technol, D-40789 Monheim, Germany. Additional authors for this research include O. Gutbrod, P. Lummen, S. Matthiesen, C. Schorn and R. Nauen (see also Pesticides).

Keywords for this news article include: Europe, Monheim, Germany, Pesticides, Insecticides

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2015, NewsRx LLC

(c) 2015 NewsRx LLC, source Health Newsletters

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