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Tree Physiol

Title:		Oak powdery mildew (Erysiphe alphitoides)-induced volatile emissions scale with the degree of infection in Quercus robur
Author(s):		Copolovici L; Vaartnou F; Portillo Estrada M; Niinemets U;
Address:		"Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 1 Kreutzwaldi, 51014 Tartu, Estonia Institute of Research, Development, Innovation in Technical and Natural Sciences, 'Aurel Vlaicu' University, 2 Elena Dragoi, 310330 Arad, Romania lucian.copolovici@emu.ee. Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 1 Kreutzwaldi, 51014 Tartu, Estonia. Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 1 Kreutzwaldi, 51014 Tartu, Estonia Centre of Excellence PLECO (Plant and Vegetation Ecology), Department of Biology, University of Antwerp, Universiteitsplein 1, B-2610, Wilrijk, Belgium. Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 1 Kreutzwaldi, 51014 Tartu, Estonia Estonian Academy of Sciences, 6 Kohtu, 10130 Tallinn, Estonia"
Journal Title:		Tree Physiol
Year:		2014
Volume:		20141125
Issue:		12
Page Number:		1399 - 1410
DOI:		10.1093/treephys/tpu091
ISSN/ISBN:		1758-4469 (Electronic) 0829-318X (Print) 0829-318X (Linking)
Abstract:		"Oak powdery mildew (Erysiphe alphitoides) is a major foliar pathogen of Quercus robur often infecting entire tree stands. In this study, foliage photosynthetic characteristics and constitutive and induced volatile emissions were studied in Q. robur leaves, in order to determine whether the changes in foliage physiological traits are quantitatively associated with the degree of leaf infection, and whether infection changes the light responses of physiological traits. Infection by E. alphitoides reduced net assimilation rate by 3.5-fold and isoprene emission rate by 2.4-fold, and increased stomatal conductance by 1.6-fold in leaves with the largest degree of infection of approximately 60%. These alterations in physiological activity were quantitatively associated with the fraction of leaf area infected. In addition, light saturation of net assimilation and isoprene emission was reached at lower light intensity in infected leaves, and infection also reduced the initial quantum yield of isoprene emission. Infection-induced emissions of lipoxygenase pathway volatiles and monoterpenes were light-dependent and scaled positively with the degree of infection. Overall, this study indicates that the reduction of foliage photosynthetic activity and constitutive emissions and the onset of stress volatile emissions scale with the degree of infection, but also that the infection modifies the light responses of foliage physiological activities"
Keywords:		"*Ascomycota Butadienes/metabolism Environment Hemiterpenes/metabolism *Light Monoterpenes/metabolism Oils, Volatile/*metabolism Pentanes/metabolism *Photosynthesis Plant Diseases/*microbiology Plant Leaves/metabolism/microbiology/physiology Quercus/metabo;"
Notes:		"MedlineCopolovici, Lucian Vaartnou, Fred Portillo Estrada, Miguel Niinemets, Ulo eng 322603/ERC_/European Research Council/International Research Support, Non-U.S. Gov't Canada 2014/11/28 Tree Physiol. 2014 Dec; 34(12):1399-410. doi: 10.1093/treephys/tpu091. Epub 2014 Nov 25"