Abstract
In dominant old-field plant species, genotypic variation in traits important for herbivorous insects may explain variation in insect species abundance. While the importance of plant genetic identity on arthropod abundance has been demonstrated, specific factors that drive genotype choice by insects remain largely unknown. Sixteen genotypes of the widely distributed plant species Solidago altissima were used to investigate the possible role of nutrients and terpene secondary metabolites in shaping the abundance of a common specialist aphid, Uroleucon nigrotuberculatum. Ramets were propagated in a greenhouse and then transferred to a natural field setting. After 76 days, aphid abundance was quantified and leaf tissue assayed for nutrients and terpenes. Aphids/g plant biomass significantly differed among genotypes, with a 30-fold difference observed among plant genotypes. Leaf nitrogen, C:N ratio and water did not vary among genotypes. Of eight terpenes quantified, five were influenced by plant genotype. Aphid abundance increased marginally with the concentration of the monoterpene β-pinene in leaf tissue (P = 0.056). A partial least squares analysis determined that nutritional chemicals did not explain aphid responses, while 49 % of the variation in aphid colonization among genotypes was explained by terpenes. This study is one of the first to demonstrate that variation in allelochemicals may be related to differences in the abundance of a key herbivore among genotypes of a plant species that exhibits large intraspecific genetic variation.
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Acknowledgments
We thank the field crew at the Gilley Research Station, including Jessica, Eli, and Sophie Howells, Jeff Williams, Bryan Taylor, Peter Blum, and Mathew Swain. Special thanks to Drs. Jennifer Schweitzer and Joseph Bailey at the University of Tennessee-Knoxville for supplying the plants. We also acknowledge the contribution of colleagues and anonymous reviewers, which increased the quality of the manuscript. Support for work with gas chromatography came from Dr. Barkley Sive and David Farrar in the Department of Chemistry at Appalachian State University (ASU). The Cratis Williams Graduate School and Office of Student Research at ASU provided financial support.
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Williams, R.S., Avakian, M.A. Colonization of Solidago altissima by the Specialist Aphid Uroleucon nigrotuberculatum: Effects of Genetic Identity and Leaf Chemistry. J Chem Ecol 41, 129–138 (2015). https://doi.org/10.1007/s10886-015-0546-1
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DOI: https://doi.org/10.1007/s10886-015-0546-1