Plant defense resistance in natural enemies of a specialist insect herbivore

Zhang, Xi; van Doan, Cong; Arce, Carla C.M.; Hu, Lingfei; Grünig, Sandra; Parisod, Christian Gérard; Hibbard, Bruce E.; Hervé, Maxime; Robert, Christelle A. M.; Machado, Ricardo A.R.; Erb, Matthias (24 July 2019). Plant defense resistance in natural enemies of a specialist insect herbivore (bioRxiv). Cold Spring Harbor Laboratory 10.1101/710681

[img]
Preview
Text
2019_bioRxiv_710681.pdf - Submitted Version
Available under License Creative Commons: Attribution-Noncommercial-No Derivative Works (CC-BY-NC-ND).

Download (4MB) | Preview

Plants defend themselves against herbivores through the production of toxic and deterrent metabolites. Adapted herbivores can tolerate and sequester these metabolites, allowing them to feed on defended plants and become toxic to their own enemies. Can herbivore natural enemies overcome sequestered plant defense metabolites to prey on adapted herbivores? To address this question, we studied how entomopathogenic nematodes cope with benzoxazinoid defense metabolites that are produced by grasses and sequestered by a specialist maize herbivore, the western corn rootworm. We find that nematodes from US maize fields in regions in which the western corn rootworm was present over the last 50 years are behaviorally and metabolically resistant to sequestered benzoxazinoids and more infective towards the western corn rootworm than nematodes from other parts of the world. Exposure of a benzoxazinoid-susceptible nematode strain to the western corn rootworm for five generations results in higher behavioral and metabolic resistance and benzoxazinoid-dependent infectivity towards the western corn rootworm. Thus, herbivores that are exposed to a plant defense sequestering herbivore can evolve both behavioral and metabolic resistance to plant defense metabolites, and these traits are associated with higher infectivity towards a defense sequestering herbivore. We conclude that plant defense metabolites that are transferred through adapted herbivores may result in the evolution of resistance in herbivore natural enemies. Our study also identifies plant defense resistance as a novel target for the improvement of biological control agents.

Item Type:

Working Paper

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Ecological Genomics
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:

Zhang, Xi; Doan, Van Cong; Marques Arce, Carla Cristina; Hu, Lingfei; Grünig, Sandra; Parisod, Christian Gérard; Hervé, Maxime; Robert, Christelle Aurélie Maud; Machado, Ricardo and Erb, Matthias

Subjects:

500 Science > 580 Plants (Botany)

Series:

bioRxiv

Publisher:

Cold Spring Harbor Laboratory

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

26 Aug 2019 16:43

Last Modified:

23 Oct 2019 15:42

Publisher DOI:

10.1101/710681

Uncontrolled Keywords:

tritrophic interactions, plant secondary metabolism, biological control

BORIS DOI:

10.7892/boris.132574

URI:

https://boris.unibe.ch/id/eprint/132574

Actions (login required)

Edit item Edit item
Provide Feedback