| Feeding by emerald ash borer larvae induces systemic changes in black ash foliar chemistry. | |
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MedLine Citation:
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PMID: 21802697 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The exotic wood-boring pest, emerald ash borer (EAB), Agrilus planipennis Fairmaire (Coleoptera: Buprestidae), has been threatening North American ash (Fraxinus spp.) resources, this being recognized since its first detection in Michigan, USA and Ontario, Canada in 2002. Ash trees are killed by larval feeding in the cambial region, which results in disruption of photosynthate and nutrient translocation. In this study, changes in volatile and non-volatile foliar phytochemicals of potted 2-yr-old black ash, Fraxinus nigra Marshall, seedlings were observed in response to EAB larval feeding in the main stem. EAB larval feeding affected levels of six compounds [hexanal, (E)-2-hexenal, (Z)-3-hexenyl acetate, (E)-β-ocimene, methyl salicylate, and (Z,E)-α-farnesene] with patterns of interaction depending upon compounds of interest and time of observation. Increased methyl salicylate emission suggests similarity in responses induced by EAB larval feeding and other phloem-feeding herbivores. Overall, EAB larval feeding suppressed (Z)-3-hexenyl acetate emission, elevated (E)-β-ocimene emission in the first 30days, but emissions leveled off thereafter, and generally increased the emission of (Z,E)-α-farnesene. Levels of carbohydrates and phenolics increased overall, while levels of proteins and most amino acids decreased in response to larval feeding. Twenty-three amino acids were consistently detected in the foliage of black ash. The three most abundant amino acids were aspartic acid, glutamic acid, glutamine, while the four least abundant were α-aminobutyric acid, β-aminoisobutyric acid, methionine, and sarcosine. Most (16) foliar free amino acids and 6 of the 9 detected essential amino acids decreased with EAB larval feeding. The ecological consequences of these dynamic phytochemical changes on herbivores harbored by ash trees and potential natural enemies of these herbivores are discussed. |
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Authors:
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Yigen Chen; Justin G A Whitehill; Pierluigi Bonello; Therese M Poland |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-7-28 |
Journal Detail:
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Title: Phytochemistry Volume: - ISSN: 1873-3700 ISO Abbreviation: - Publication Date: 2011 Jul |
Date Detail:
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Created Date: 2011-8-1 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0151434 Medline TA: Phytochemistry Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Elsevier Ltd. All rights reserved. |
Affiliation:
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Department of Entomology, Michigan State University, East Lansing, MI 48824, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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