Short-chained oxygenated VOC emissions in Pinus halepensis in response to changes in water availability
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Short-chained oxygenated VOC (oxVOCs) emissions from Pinus halepensis saplings were monitored in response to changes in water availability. Online measurements were made with a proton transfer reaction—mass spectrometer under controlled conditions, together with CO2 and H2O exchange measurements. Masses corresponding to methanol and acetone were the most emitted oxVOCs. All the oxVOC exchanges, except that of acetone (M59), were significantly related to stomatal conductance and transpiration. Acetaldehyde (M45) emission showed, moreover, a strong dependence on the concentration of acetaldehyde in the ambient: stomatal opening (stomatal conductance above 75 mmol m−2 s−1) only allowed increased emissions when external concentration were below 6 ppb. Acetone (M59) presented an important peak of emission following light and stomatal opening in the morning when plants were water stressed. Thus, the alterations in oxVOC emissions in P. halepensis caused by the water deficit seem to be mainly driven by water stress effect on stomatal closure and oxVOC air concentrations.
KeywordsAcetaldehyde Acetic acid Acetone Drought Ethanol Formic acid Methanol oxVOCs Pinus halepensis
This research was partially supported by Spanish MCYT grants REN2003-04871, CGL2004-01402/BOS and CGL-2006-04025/BOS, the European Commission RTN “ISONET” contract MC-RTN-CT-2003-504720, the European Science Foundation “VOCBAS” program, a Fundación BBVA 2004 grant and a Catalan government SGR2005-00312 grant. Roger Seco gratefully acknowledges a FPI fellowship (BES-2005-6989) from MEC (Spanish Government).
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