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Tree Physiol

Title:		Contrasting responses of silver birch VOC emissions to short- and long-term herbivory
Author(s):		Maja MM; Kasurinen A; Yli-Pirila P; Joutsensaari J; Klemola T; Holopainen T; Holopainen JK;
Address:		"Department of Environmental Science, University of Eastern Finland, PO Box 1627, FI-70211 Kuopio Campus, Finland"
Journal Title:		Tree Physiol
Year:		2014
Volume:		20140313
Issue:		3
Page Number:		241 - 252
DOI:		10.1093/treephys/tpt127
ISSN/ISBN:		1758-4469 (Electronic) 0829-318X (Linking)
Abstract:		"There is a need to incorporate the effects of herbivore damage into future models of plant volatile organic compound (VOC) emissions at leaf or canopy levels. Short-term (a few seconds to 48 h) changes in shoot VOC emissions of silver birch (Betula pendula Roth) in response to feeding by geometrid moths (Erannis defoliaria Hubner) were monitored online by proton transfer reaction time-of-flight mass spectrometry (PTR-TOF-MS). In addition, two separate field experiments were established to study the effects of long-term foliage herbivory (FH, 30-32 days of feeding by geometrids Agriopis aurantiaria (Clerck) and E. defoliaria in two consecutive years) and bark herbivory (BH, 21 days of feeding by the pine weevil (Hylobius abietis L.) in the first year) on shoot and rhizosphere VOC emissions of three silver birch genotypes (gt14, gt15 and Hausjarvi provenance). Online monitoring of VOCs emitted from foliage damaged by geometrid larvae showed rapid bursts of green leaf volatiles (GLVs) immediately after feeding activity, whereas terpenoid emissions had a tendency to gradually increase during the monitoring period. Long-term FH caused transient increases in total monoterpene (MT) emissions from gt14 and sesquiterpene (SQT) emissions from Hausjarvi provenance, mainly in the last experimental season. In the BH experiment, genotype effects were detected, with gt14 trees having significantly higher total MT emissions compared with other genotypes. Only MTs were detected in the rhizosphere samples of both field experiments, but their emission rates were unaffected by genotype or herbivory. The results suggest that silver birch shows a rapid VOC emission response to short-term foliage herbivory, whereas the response to long-term foliage herbivory and bark herbivory is less pronounced and variable at different time points"
Keywords:		Betula/genetics/*physiology Herbivory/*physiology Linear Models Plant Bark/physiology Plant Leaves/physiology Principal Component Analysis Terpenes/analysis Time Factors Volatile Organic Compounds/*analysis bark herbivory foliage herbivory genotype geomet;
Notes:		"MedlineMaja, Mengistu M Kasurinen, Anne Yli-Pirila, Pasi Joutsensaari, Jorma Klemola, Tero Holopainen, Toini Holopainen, Jarmo K eng Research Support, Non-U.S. Gov't Canada 2014/03/15 Tree Physiol. 2014 Mar; 34(3):241-52. doi: 10.1093/treephys/tpt127. Epub 2014 Mar 13"