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Comparative phloem chemistry of manchurian (Fraxinus mandshurica) and two North American ash species (Fraxinus americana and Fraxinus pennsylvanica)

Journal of Chemical Ecology, ISSN: 0098-0331, Vol: 33, Issue: 7, Page: 1430-1448
2007
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Differential persistence of blue ash and white ash following emeraldash borer invasion

  Introduction    Emerald ash borer, Agrilus planipennis Fairmaire (Coleoptera: Buprestidae), a phloem-boring beetle native to Asia (Chinese Academy of Science, Institute of Zoology 1986; Yu 1992),

Article Description

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. © 2007 Springer Science+Business Media, LLC.

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