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Abstract

Recent studies have investigated interspecific variation in resistance of ash (Fraxinus spp.) to the exotic wood-boring beetle, emerald ash borer (EAB, Agrilus planipennis). Manchurian ash (Fraxinus mandshurica) is an Asian species that has coevolved with EAB. It experiences little EAB-induced mortality compared to North American ashes. Host phloem chemistry, both constitutive and induced, might partly explain this interspecific variation in resistance. We analyzed the constitutive phloem
chemistry of three ash species: Manchurian ash and North American white (Fraxinus americana) and green (Fraxinus pennsylvanica) ash. Analysis of the crude phloem extracts
revealed the presence of an array of phenolic compounds including hydroxycoumarins, a monolignol, lignans, phenylethanoids, and secoiridoids. Both qualitative and quantitative differences were observed among the three ash species. Hydroxycoumarins and the phenylethanoids,
calceloariosides A and B, were present only in the phloem of Manchurian ash and might represent a mechanism of resistance against EAB.

Item Type:	Article
Authors/Creators:	Eyles, A and Jones, W and Riedl, K and Cipollini, D and Schwartz, S and Chan, K and Herms, DA and Bonello, P
Keywords:	Agrilus planipennis . LC-MS . Hydroxycoumarins . Phenolics . Coevolution . Host resistance . Invasive species
Journal or Publication Title:	Journal of Chemical Ecology
ISSN:	0098-0331
DOI / ID Number:	https://doi.org/10.1007/s10886-007-9312-3
Additional Information:	The original publication is available at www.springerlink.com
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