Online analysis of volatile organic compound emissions from Sitka spruce (Picea sitchensis)

Hayward, S and Tani, A and Owen, S M and Hewitt, C. N. (2004) Online analysis of volatile organic compound emissions from Sitka spruce (Picea sitchensis). Tree Physiology, 24 (7). pp. 721-728. ISSN 1758-4469

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Volatile organic compound (VOC) emissions from Sitka spruce (Picea sitchensis Bong.) growing in a range of controlled light and temperature regimes were monitored online with a proton transfer reaction-mass spectrometer (PTR-MS) operating at a temporal resolution of similar to1 min. Isoprene emissions accounted for an average of more than 70% of measured VOCs and up to 3.5% of assimilated carbon. Emission rates (E) for isoprene correlated closely with photosynthetic photon flux (PPF) and temperature, showing saturation at a PPF of between 300 and 400 mumol m(-2) s(-1) and a maximum between 35 and 38degreesC. Under standard conditions of 30degreesC and 1000 mumol m(-2) s(-1) PPF, the mean isoprene E was 13 mug g(dm)(-1) h(-1), considerably higher than previously observed in this species. Mean E for acetaldehyde, methanol and monoterpenes at 30degreesC were 0.37,0.78 and 2.97 mug g(dm)(-1) h(-1), respectively. In response to a sudden light to dark transition, isoprene E decreased exponentially by > 98% over about 3 h; however, during the first 7 min, this otherwise steady decay was temporarily but immediately depressed to similar to40% of the pre-darkness rate, before rallying during the following 7 min to rejoin the general downward trajectory of the exponential decay. The sudden sharp fall in isoprene E was mirrored by a burst in acetaldehyde E. The acetaldehyde E maximum coincided with the isoprene E minimum (7 min post-illumination), and ceased when isoprene emissions resumed their exponential decay. The causes of, and linkages between, these phenomena were investigated.

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Tree Physiology
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22 Nov 2011 15:28
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16 Sep 2023 00:39