Headspace Volatiles from 52 oak Species Advertise Induction, Species Identity, and Evolution, but not Defense
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Leaf volatiles convey information about a plant to other organisms in their proximity. Despite increasing interest in understanding the relevance of volatile emissions for particular ecological interactions, there has been relatively little effort to assess generally what information volatile profiles transmit. We surveyed the volatile profiles of wounded and unwounded leaves of 52 oak (Quercus) species. We used phylogenetic comparison and multivariate techniques to assess in what circumstances oak individuals advertised their species identity, evolutionary history, direct defenses, or damage. We found that both species identity and evolutionary history were advertised when leaves were wounded, but species could not be differentiated by odor when leaves were not wounded. Various fatty-acid derivative compounds showed the strongest phylogenetic signal suggesting that they may best disclose taxonomic affiliations in oaks. We tested whether oak volatile composition or diversity advertised high defensive investment, but we found no evidence for this. Wounded leaves disclose much about an oak species’ identity and taxonomic affiliation, but unwounded leaves do not. This is consistent with the idea that volatile information is targeted toward natural enemy recruitment.
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- Headspace Volatiles from 52 oak Species Advertise Induction, Species Identity, and Evolution, but not Defense
Journal of Chemical Ecology
Volume 39, Issue 1 , pp 90-100
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- 1. Department Entomology, UC Davis, Davis, CA, 95616, USA
- 2. U. S. Department of Agriculture, Plant Mycotoxin Research, Western Regional Research Center, Agricultural Research Service, 800 Buchanan Street, Albany, CA, 94710, USA
- 3. Department Neurobiology and Behavior, Cornell University, Ithaca, NY, 14853, USA