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Journal of Chemical Ecology

, Volume 39, Issue 8, pp 1101–1111 | Cite as

A Genetically-Based Latitudinal Cline in the Emission of Herbivore-Induced Plant Volatile Organic Compounds

  • Elizabeth L. Wason
  • Anurag A. Agrawal
  • Mark D. Hunter
Article

Abstract

The existence of predictable latitudinal variation in plant defense against herbivores remains controversial. A prevailing view holds that higher levels of plant defense evolve at low latitudes compared to high latitudes as an adaptive plant response to higher herbivore pressure on low-latitude plants. To date, this prediction has not been examined with respect to volatile organic compounds (VOCs) that many plants emit, often thus attracting the natural enemies of herbivores. Here, we compared genetically-based constitutive and herbivore-induced aboveground vegetative VOC emissions from plants originating across a gradient of more than 10° of latitude (>1,500 km). We collected headspace VOCs from Asclepias syriaca (common milkweed) originating from 20 populations across its natural range and grown in a common garden near the range center. Feeding by specialist Danaus plexippus (monarch) larvae induced VOCs, and field environmental conditions (temperature, light, and humidity) also influenced emissions. Monarch damage increased plant VOC concentrations and altered VOC blends. We found that genetically-based induced VOC emissions varied with the latitude of plant population origin, although the pattern followed the reverse of that predicted—induced VOC concentration increased with increasing latitude. This pattern appeared to be driven by a greater induction of sesquiterpenoids at higher latitudes. In contrast, constitutive VOC emission did not vary systematically with latitude, and the induction of green leafy volatiles declined with latitude. Our results do not support the prevailing view that plant defense is greater at lower than at higher latitudes. That the pattern holds only for herbivore-induced VOC emission, and not constitutive emission, suggests that latitudinal variation in VOCs is not a simple adaptive response to climatic factors.

Keywords

Common milkweed Asclepias syriaca Herbivory Indirect defense Latitudinal gradient Monarch butterfly Danaus plexippus Volatile organic compounds 

Notes

Acknowledgments

This work was supported by funding from NSF grants (DEB 0814340 to MDH, IGERT BART to ELW, and DEB 0447550 and 1118783 to AAA). We thank Ellen Woods and Amy Hastings for establishing the common garden and for logistical support, Andre Kessler and Rayko Halitschke for sharing advice about VOC collection and analysis, Tony Sutterley for assistance in constructing the VOC sampling equipment, Christoph Vogel for help with LI-COR instruments, and M. Jahi Chappell and Lela for hospitable lodging. We also thank Richard Karban for feedback regarding our results and Robert Raguso, Martin Heil, and an anonymous reviewer for constructive comments on this manuscript.

Supplementary material

10886_2013_309_MOESM1_ESM.doc (151 kb)
Online Resource 1 (DOC 151 kb)
10886_2013_309_MOESM2_ESM.doc (436 kb)
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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Elizabeth L. Wason
    • 1
  • Anurag A. Agrawal
    • 2
    • 3
  • Mark D. Hunter
    • 1
  1. 1.Department of Ecology and Evolutionary BiologyUniversity of Michigan, Ann ArborAnn ArborUSA
  2. 2.Department of Ecology and Evolutionary BiologyCornell UniversityIthacaUSA
  3. 3.Department of EntomologyCornell UniversityIthacaUSA

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