« Previous Abstract"Acetophenone as an anti-attractant for the western pine beetle, Dendroctonus Brevicomis LeConte (Coleoptera: Scolytidae)"    Next AbstractChemical similarity between historical and novel host plants promotes range and host expansion of the mountain pine beetle in a naive host ecosystem »

Tree Physiol

Title:		Differential effects of plant ontogeny and damage type on phloem and foliage monoterpenes in jack pine (Pinus banksiana)
Author(s):		Erbilgin N; Colgan LJ;
Address:		"Department of Renewable Resources, 442 Earth Sciences Building, University of Alberta, Edmonton, AB, Canada T6G 2E3. erbilgin@ualberta.ca"
Journal Title:		Tree Physiol
Year:		2012
Volume:		20120601
Issue:		8
Page Number:		946 - 957
DOI:		10.1093/treephys/tps047
ISSN/ISBN:		1758-4469 (Electronic) 0829-318X (Linking)
Abstract:		"Coniferous trees have both constitutive and inducible defences that deter or kill herbivores and pathogens. We investigated constitutive and induced monoterpene responses of jack pine (Pinus banksiana Lamb.) to a number of damage types: a fungal associate of the mountain pine beetle (Dendroctonus ponderosae Hopkins), Grosmannia clavigera (Robinson-Jeffrey & R.W. Davidson); two phytohormones, methyl jasmonate (MJ) and methyl salicylate (MS); simulated herbivory; and mechanical wounding. We only included the fungal, MJ and mechanical wounding treatments in the field experiments while all treatments were part of the greenhouse studies. We focused on both constitutive and induced responses between juvenile and mature jack pine trees and differences in defences between phloem and needles. We found that phytohormone applications and fungal inoculation resulted in the greatest increase in monoterpenes in both juvenile and mature trees. Additionally, damage types differentially affected the proportions of individual monoterpenes: MJ-treated mature trees had higher myrcene and beta-pinene than fungal-inoculated mature trees, while needles of juveniles inoculated with the fungus contained higher limonene than MJ- or MS-treated juveniles. Although the constitutive monoterpenes were higher in the phloem of juveniles than mature jack pine trees, the phloem of mature trees had a much higher magnitude of induction. Further, induced monoterpene concentrations in juveniles were higher in phloem than in needles. There was no difference in monoterpene concentration between phytohormone applications and G. clavigera inoculation in mature trees, while in juvenile trees MJ was different from both G. clavigera and simulated herbivory in needle monoterpenes, but there was no difference between phytohormone applications and simulated herbivory in the phloem"
Keywords:		Acetates/pharmacology Animals *Ascomycota Coleoptera/microbiology Cyclopentanes/pharmacology Monoterpenes/*metabolism Oxylipins/pharmacology Phloem/drug effects/*metabolism/microbiology Pinus/drug effects/*metabolism/microbiology *Plant Diseases/microbiol;
Notes:		"MedlineErbilgin, Nadir Colgan, L Jessie eng Research Support, Non-U.S. Gov't Canada 2012/06/05 Tree Physiol. 2012 Aug; 32(8):946-57. doi: 10.1093/treephys/tps047. Epub 2012 Jun 1"