Entomopathogenic nematodes from Mexico that can overcome the resistance mechanisms of the western corn rootworm

Bruno, Pamela; Machado, Ricardo A. R.; Glauser, Gaétan; Köhler, Angela; Campos-Herrera, Raquel; Bernal, Julio; Toepfer, Stefan; Erb, Matthias; Robert, Christelle A. M.; Arce, Carla C. M.; Turlings, Ted C. J. (2020). Entomopathogenic nematodes from Mexico that can overcome the resistance mechanisms of the western corn rootworm. Scientific reports, 10(1), p. 8257. Springer Nature 10.1038/s41598-020-64945-x

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Natural enemies of herbivores are expected to adapt to the defence strategies of their preys or hosts. Such adaptations may also include their capacity to cope with plant metabolites that herbivores sequester as a defence. In this study, we evaluated the ability of Mexican entomopathogenic nematodes (EPN) to resist benzoxazinoids that are sequestered from maize roots by the western corn rootworm (WCR, Diabrotica virgifera virgifera; Coleoptera: Chrysomelidae), an important maize pest in America and Europe. From maize fields throughout Mexico, we retrieved 40 EPN isolates belonging to five different species, with a majority identified as Heterorhabditis bacteriophora. In the laboratory, all nematodes readily infected non-sequestering larvae of the banded cucumber beetle (D. balteata), while infectivity varied strongly for WCR larvae. While some H. bacteriophora isolates seemed negatively affected by benzoxazinoids, most showed to be resistant. Thus, EPN from Mexican maize fields can cope with these plant defence metabolites, but the results also indicate that WCR larvae possess other mechanisms that help to resist EPN. This work contributes to a better understanding of the capacity of herbivore natural enemies to resist plant defence metabolites. Furthermore, it identifies several benzoxazinoid-resistant EPN isolates that may be used to control this important maize pest.

Item Type:

Journal Article (Review Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Biotic Interactions
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Machado, Ricardo; Erb, Matthias and Robert, Christelle Aurélie Maud

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

2045-2322

Publisher:

Springer Nature

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

23 Jun 2020 15:44

Last Modified:

11 Mar 2021 21:04

Publisher DOI:

10.1038/s41598-020-64945-x

PubMed ID:

32427834

BORIS DOI:

10.7892/boris.144733

URI:

https://boris.unibe.ch/id/eprint/144733

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