MassIVE MSV000100870

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Induced volatile chemistry and arthropod predation across a tree diversity gradient

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Description

Plant volatile organic compounds (VOCs) play a key role in defense against herbivores and in mediating multitrophic interactions. Yet, how surrounding plant diversity modulates these responses in forest trees remains poorly understood. We examined the effects of tree species richness on induced VOC emissions and arthropod predation in Quercus petraea in a biodiversity-ecosystem functioning experiment. Individual branches were repeatedly induced with methyl jasmonate and paired with non-induced controls. VOCs were collected using PDMS tubes after the first and last induction rounds and analyzed by TD-GC-MS. Predation was quantified using artificial clay caterpillars. Jasmonate induction strongly altered VOC profiles, with effects increasing after repeated treatments. Tree species richness modulated VOC composition during the first sampling period, particularly affecting sesquiterpenes. However, absolute VOC compound class emissions did not explain variation in arthropod predation probability, while class-level composition showed only weak and inconsistent effects across sampling periods. These results suggest that indirect defense outcomes in terms of predator responses are unlikely to depend on overall VOC emission strength or broad chemical classes but may instead be mediated by fine-scale properties of volatile blends. [doi:10.25345/C5CC0V706] [dataset license: CC0 1.0 Universal (CC0 1.0)]

Keywords: volatile organic compounds ; jasmonate-induced defense ; tree species richness ; Quercus petraea ; DatasetType:Proteomics

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Principal Investigators:
(in alphabetical order) 		Gabriela A. S. Escaliante, German Centre for Integrative Biodiversity Research (iDiv), Germany
Submitting User: gabrielaescaliante
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