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Environ Exp Bot

Title:		Disproportionate photosynthetic decline and inverse relationship between constitutive and induced volatile emissions upon feeding of Quercus robur leaves by large larvae of gypsy moth (Lymantria dispar)
Author(s):		Copolovici L; Pag A; Kannaste A; Bodescu A; Tomescu D; Copolovici D; Soran ML; Niinemets U;
Address:		"Faculty of Food Engineering, Tourism and Environmental Protection, Research Center in Technical and Natural Sciences, 'Aurel Vlaicu' University, Romania, 2 Elena Dragoi, Arad 310330, Romania. Institute of Technical and Natural Sciences Research-Development of 'Aurel Vlaicu' University, Romania, 2 Elena Dragoi, Arad 310330, Romania. Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia. National Institute of Research and Development for Isotopic and Molecular Technologies, Cluj-Napoca 400293, Romania. Estonian Academy of Sciences, Kohtu 6, 10130 Tallinn, Estonia"
Journal Title:		Environ Exp Bot
Year:		2017
Volume:		138
Issue:
Page Number:		184 - 192
DOI:		10.1016/j.envexpbot.2017.03.014
ISSN/ISBN:		0098-8472 (Print) 0098-8472 (Linking)
Abstract:		"Gypsy moth (Lymantria dispar L., Lymantriinae) is a major pest of pedunculate oak (Quercus robur) forests in Europe, but how its infections scale with foliage physiological characteristics, in particular with photosynthesis rates and emissions of volatile organic compounds has not been studied. Differently from the majority of insect herbivores, large larvae of L. dispar rapidly consume leaf area, and can also bite through tough tissues, including secondary and primary leaf veins. Given the rapid and devastating feeding responses, we hypothesized that infection of Q. robur leaves by L. dispar leads to disproportionate scaling of leaf photosynthesis and constitutive isoprene emissions with damaged leaf area, and to less prominent enhancements of induced volatile release. Leaves with 0% (control) to 50% of leaf area removed by larvae were studied. Across this range of infection severity, all physiological characteristics were quantitatively correlated with the degree of damage, but all these traits changed disproportionately with the degree of damage. The net assimilation rate was reduced by almost 10-fold and constitutive isoprene emissions by more than 7-fold, whereas the emissions of green leaf volatiles, monoterpenes, methyl salicylate and the homoterpene (3E)-4,8-dimethy-1,3,7-nonatriene scaled negatively and almost linearly with net assimilation rate through damage treatments. This study demonstrates that feeding by large insect herbivores disproportionately alters photosynthetic rate and constitutive isoprene emissions. Furthermore, the leaves have a surprisingly large capacity for enhancement of induced emissions even when foliage photosynthetic function is severely impaired"
Keywords:		green leaf volatiles induced emissions isoprene emission large insect herbivores monoterpene emission photosynthesis quantitative responses volatile organic compounds;
Notes:		"PubMed-not-MEDLINECopolovici, Lucian Pag, Andreea Kannaste, Astrid Bodescu, Adina Tomescu, Daniel Copolovici, Dana Soran, Maria-Loredana Niinemets, Ulo eng 322603/ERC_/European Research Council/International England 2018/01/26 Environ Exp Bot. 2017 Jun; 138:184-192. doi: 10.1016/j.envexpbot.2017.03.014"