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Journal of Chemical Ecology

, Volume 42, Issue 8, pp 829–840 | Cite as

CHEMOTYPIC Variation in Volatiles and Herbivory for Sagebrush

  • Richard Karban
  • Patrick Grof-Tisza
  • James D. Blande
Article

Abstract

Plants that are damaged by herbivores emit complex blends of volatile compounds that often cause neighboring branches to induce resistance. Experimentally clipped sagebrush foliage emits volatiles that neighboring individuals recognize and respond to. These volatiles vary among individuals within a population. Two distinct types are most common with either thujone or camphor as the predominate compound, along with other less common types. Individuals respond more effectively to cues from the same type, suggesting that some of the informative message is contained in the compounds that differentiate the types. In this study, we characterized the chemical profiles of the two common types, and we examined differences in their microhabitats, morphologies, and incidence of attack by herbivores and pathogens. Analysis by gas chromatography coupled with mass spectrometry revealed that the camphor type had higher emissions of camphor, camphene, and tricyclene, while the thujone type emitted more α-thujone, β-thujone, (Z)-salvene, (E)-salvene, carvacrol, and various derivatives of sabinene. We were unable to detect any consistent morphological or microhabitat differences associated with the common types. However, plants of the thujone type had consistently higher rates of damage by chewing herbivores. One galling midge species was more common on thujone plants, while a second midge species was more likely to gall plants of the camphor type. The diversity of preferences of attackers may help to maintain the variation in volatile profiles. These chemical compounds that differentiate the types are likely to be informative cues and deserve further attention.

Keywords

Camphor Cue Eavesdropping Herbivore Induced resistance Information Priming Thujone Volatile organic compound 

Notes

Acknowledgments

We thank Mikaela Huntzinger, Hongjun Li, Enrico Pezzola, and Kaori Shiojiri for help in the field. Shree Prasad identified pathogens of sagebrush and Will Wetzel identified some of the herbivores. Tao Li provided advice on the PCA analysis. Wittko Francke and Martin Heil improved the manuscript. The work was conducted in UC Sagehen Experimental Forest and other sites in the Tahoe National Forest, and we thank Jeff Brown and Faerthan Felix for facilitating our research at these sites.

Supplementary material

10886_2016_741_MOESM1_ESM.docx (12 kb)
ESM 1 (DOCX 12 kb)

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Department of Entomology and NematologyUniversity of California, DavisDavisUSA
  2. 2.Ecology Graduate Group, Department of Entomology and NematologyUniversity of California, DavisDavisUSA
  3. 3.Department of Environmental ScienceUniversity of Eastern FinlandKuopioFinland

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