Abstract
White fringetree is a host for the invasive emerald ash borer (EAB) but is of lower quality than the related and highly susceptible black ash. Field observations suggest that host trees grown in full sun are more resistant to EAB than those in shade, however the impact of light limitation on chemical defenses has not been assessed. We quantified constitutive and jasmonate-induced phloem defenses and growth patterns of white fringetree and black ash under differential light conditions and related them to EAB larval performance. White fringetree had significantly lower constitutive and induced activities of peroxidase, polyphenol oxidase, β-glucosidase, chitinase and lignin content, but significantly higher gallic acid equivalent soluble phenolic, soluble sugar, and oleuropein concentrations compared to black ash. Multivariate analyses based on tissue chemical attributes displayed clear separation of species and induced defense responses. Further, EAB performed significantly worse on white fringetree than black ash, consistent with previous studies. Light limitation did not impact measured defenses or EAB larval performance, but it did decrease current year growth and increase photosynthetic efficiency. Overall our results suggest that phenolic profiles, metabolite abundance, and growth traits are important in mediating white fringetree resistance to EAB, and that short-term light limitation does not influence phloem chemistry or larval success.
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Data available at: https://github.com/mfriedman95/ChionanthusvirginicusEAB
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Acknowledgments
We thank Donnie Peterson, Emily Ellison, Alicia Goffe, and Juan Manuel Perilla Lopez for assistance in both field and laboratory components of this experiment. This project was funded in part by USDA-APHIS Cooperative Agreement 15-8130-0539-CA and the Graduate Student Association of Wright State University.
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Funding for this project was provided in part by USDA-APHIS Cooperative Agreement 15–8130-0539-CA.
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Michael S. Friedman and Don Cipollini contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Michael S. Friedman, Chad M. Rigsby, and Don Cipollini. The first draft of the manuscript was written by Michael S. Friedman. All authors read and approved the final manuscript.
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Friedman, M.S., Rigsby, C.M. & Cipollini, D. Light Limitation Impacts Growth but Not Constitutive or Jasmonate Induced Defenses Relevant to Emerald Ash Borer (Agrilus planipennis) in White Fringetree (Chionanthus virginicus) or Black Ash (Fraxinus nigra). J Chem Ecol 46, 1117–1130 (2020). https://doi.org/10.1007/s10886-020-01223-0
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DOI: https://doi.org/10.1007/s10886-020-01223-0