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- W3011728587 abstract "Summary Insect herbivores can use volatile and visual cues to locate and select suitable host plants from a distance. The importance of CO 2 , arguable the most conserved volatile marker of metabolic activity, is not well understood in this context, even though many herbivores are known to respond to minute differences in CO 2 concentrations. To address this gap of knowledge, we manipulated CO 2 perception of the larvae of the western corn rootworm ( Diabrotica virgifera virgifera ; WCR) through RNA interference and studied how CO 2 perception impacts their interaction with their host plant, maize ( Zea mays ). We show that the expression of a putative Group 2 carbon dioxide receptor, DvvGr2 , is specifically required for dose-dependent larval responses to CO 2 in the ppm range. Silencing DvvGr2 has no effect on the ability of WCR larvae to locate host plants at short distance (<9 cm), but impairs host location at greater distances. Using soil arenas and olfactometer experiments in combination with DvvGr2 silencing and CO 2 scrubbing, we demonstrate that WCR larvae use CO 2 as a long-range host plant finding cue, but employ other volatiles for short-range host location. We furthermore show that the larvae use CO 2 as a fitness-relevant long-distance indicator of plant nutritional status: Maize plants that are well-fertilized emit more CO 2 from their roots and are better hosts for WCR than plants that are nutrient-deficient, and the capacity of WCR larvae to distinguish between these plants depends exclusively on their capacity to perceive CO 2 through DvvGr2 . This study unravels how CO 2 can mediate plant-herbivore interactions by serving as a distance-dependent host location and quality assessment cue." @default.
- W3011728587 created "2020-03-23" @default.
- W3011728587 creator A5003059316 @default.
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- W3011728587 creator A5075392541 @default.
- W3011728587 creator A5079844236 @default.
- W3011728587 date "2020-03-12" @default.
- W3011728587 modified "2023-10-18" @default.
- W3011728587 title "Plant-derived CO2 mediates long-distance host location and quality assessment by a root herbivore" @default.
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