Plant-associated CO2 mediates long-distance host location and foraging behaviour of a root herbivore

Author:

Arce Carla CM1ORCID,Theepan Vanitha2,Schimmel Bernardus CJ2,Jaffuel Geoffrey1,Erb Matthias2ORCID,Machado Ricardo AR12ORCID

Affiliation:

1. Institute of Biology, University of Neuchâtel, Neuchâtel, Switzerland

2. Institute of Plant Sciences, University of Bern, Bern, Switzerland

Abstract

Insect herbivores use different cues to locate host plants. The importance of CO2 in this context is not well understood. We manipulated CO2 perception in western corn rootworm (WCR) larvae through RNAi and studied how CO2 perception impacts their interaction with their host plant. The expression of a carbon dioxide receptor, DvvGr2, is specifically required for dose-dependent larval responses to CO2. Silencing CO2 perception or scrubbing plant-associated CO2 has no effect on the ability of WCR larvae to locate host plants at short distances (<9 cm), but impairs host location at greater distances. WCR larvae preferentially orient and prefer plants that grow in well-fertilized soils compared to plants that grow in nutrient-poor soils, a behaviour that has direct consequences for larval growth and depends on the ability of the larvae to perceive root-emitted CO2. This study unravels how CO2 can mediate plant–herbivore interactions by serving as a distance-dependent host location cue.

Funder

H2020 Marie Skłodowska-Curie Actions

Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

Publisher

eLife Sciences Publications, Ltd

Subject

General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine,General Neuroscience

Reference108 articles.

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