Abstract
Chemical defenses are thought to contribute to the invasion success and impacts of many introduced plants; however, for most of these species, little is known about these compounds and how they vary in natural environments. Plant allelochemical concentrations may be affected by a variety of abiotic and biotic factors, including soil nutrients and herbivores. Moreover, such quantitative variation is likely to play an important role in species interactions involving these invasive plants. The purpose of this study was to examine patterns of variation in iridoid glycoside concentrations of the invasive plant Linaria dalmatica (Plantaginaceae). We conducted a greenhouse experiment to investigate the effect of soil nitrogen availability on iridoid glycoside concentrations. Results from this experiment showed that plant iridoid glycoside concentrations decreased with increased nitrogen availability. Additionally, plants were collected from multiple field sites in order to characterize the influence of population, soil nitrogen availability, and herbivore attack on iridoid glycoside variation. Results from field studies indicated that plants demonstrated considerable seasonal variation, as well as variation within and among populations, with iridoid glycoside concentrations ranging from approximately 1 to 15% dry weight. The relationship between soil nitrogen and plant iridoid glycosides varied among populations, with a strong negative correlation in one population, a marginally significant negative relationship in a second population, and no relationship in the remaining two populations. Additionally, we found a negative relationship between iridoid glycoside concentrations and plant injury by an introduced biocontrol agent, the stem-mining weevil Mecinus janthinus (Cucurlionidae). These results show that plant allelochemical concentrations can vary widely in natural environments and suggest that levels of plant defense may be reduced by increased soil nitrogen availability and herbivore attack in this invasive plant species.
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Acknowledgments
Many thanks to Sarah Travers, Patrick Travers, and Nicole Won for field and laboratory assistance. We also thank the City of Boulder, Boulder County, and Linda and Sergio Sanabria for use of their land to conduct research. Timothy Seastedt, William Bowman, Susan Beatty, and Yan Linhart provided helpful comments and feedback on drafts of this manuscript. And finally, we are appreciative of the thoughtful comments provided by two anonymous reviewers. Funding for this project was provided by Boulder County Open Space and Parks, the Department of Ecology and Evolutionary Biology at the University of Colorado, the Hazel Schmoll Research Fellowship in Colorado Botany, and National Science Foundation grants DEB 0614883 and 0808473.
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Jamieson, M.A., Bowers, M.D. Soil nitrogen availability and herbivore attack influence the chemical defenses of an invasive plant (Linaria dalmatica; Plantaginaceae). Chemoecology 22, 1–11 (2012). https://doi.org/10.1007/s00049-011-0087-1
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DOI: https://doi.org/10.1007/s00049-011-0087-1