[en] Induced volatiles have been a focus of recent research, as not much is known of their emission behavior or atmospheric contribution. BVOC emissions were measured from Pseudotsuga menziesii saplings under natural environmental conditions, using a dynamic branch enclosure system and GC-MS for their analysis. We determined temperature and light dependency of the individual compounds, studied seasonality of the emissions and discuss the effect of heat stress in comparison with two specific biotic stresses that occurred naturally on the trees. A standardized emission rate of 6.8 μg g (dw) -1 h -1 for monoterpenes under stressed conditions was almost a magnitude higher than that obtained for healthy trees (0.8 ± 0.2 μg g (dw) -1 h -1), with higher beta factors characterizing the stressed trees. The response of the emissions to light intensity was different for the individual compounds, suggesting a distinct minimum light intensity to reach saturation. Heat stress changed the relative contribution of specific volatiles, with larger extent of increase of sesquiterpenes, methyl salicylate and linalool emissions compared to monoterpenes. Biotic stress kept low the emissions of sesquiterpenes, (E)-4,8-dimethyl-1,3,7-nonatriene and methylbutenol isomers, and increased the level of methyl salicylate and monoterpenes. The ratio of β-pinene/α-pinene was also found to be significantly enhanced from 1.3 to 2.4 and 3.2 for non-stressed, heat stressed and combined biotic and heat stressed, respectively.
Disciplines :
Physics
Author, co-author :
Joó, É.; Ghent University, Faculty of Bioscience Engineering, Gent, Belgium > Research Group Environmental Organic Chemistry and Technology
Dewulf, J.; Ghent University, Faculty of Bioscience Engineering, Gent, Belgium > Research Group Environmental Organic Chemistry and Technology
Amelynck, C.; Belgian Institute for Space Aeronomy, Brussels, Belgium
Schoon, N.; Belgian Institute for Space Aeronomy, Brussels, Belgium
Pokorska, O.; Ghent University, Faculty of Bioscience Engineering, Ghent, Belgium > Research Group Environmental Organic Chemistry and Technology
Šimpraga, M.; Ghent University, Faculty of Bioscience Engineering, Ghent, Belgium > Laboratory of Plant Ecology
Steppe, K.; Ghent University, Faculty of Bioscience Engineering, Ghent, Belgium > Laboratory of Plant Ecology
Aubinet, Marc ; Université de Liège - ULiège > Sciences et technologie de l'environnement > Physique des bio-systèmes
van Langenhove, H.; Ghent University, Faculty of Bioscience Engineering, Ghent, Belgium > Research Group Environmental Organic Chemistry and Technology
Language :
English
Title :
Constitutive versus heat and biotic stress induced BVOC emissions in Pseudotsuga menziesii
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