role of needle surface waxes in dynamic exchange of mono- and sesquiterpenes
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ID: 193773
2016
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Abstract
Biogenic volatile organic compounds (BVOCs) produced by plants have a major
role in atmospheric chemistry. The different physicochemical properties of
BVOCs affect their transport within and out of the plant as well as their
reactions along the way. Some of these compounds may accumulate in or on the
waxy surface layer of conifer needles and participate in chemical reactions
on or near the foliage surface. The aim of this work was to determine whether
terpenes, a key category of BVOCs produced by trees, can be found on the
epicuticles of Scots pine (Pinus sylvestris L.) and, if so, how they
compare with the terpenes found in shoot emissions of the same tree. We
measured shoot-level emissions of pine seedlings at a remote outdoor location
in central Finland and subsequently analysed the needle surface waxes for the
same compounds. Both emissions and wax extracts were clearly dominated by
monoterpenes, but the proportion of sesquiterpenes was higher in the wax
extracts. There were also differences in the terpene spectra of the emissions
and the wax extracts. The results, therefore, support the existence of BVOC
associated to the epicuticular waxes. We briefly discuss the different
pathways for terpenes to reach the needle surfaces and the implications for
air chemistry.
| Reference Key |
joensuu2016atmosphericrole
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|---|---|
| Authors | ;J. Joensuu;N. Altimir;H. Hakola;M. Rostás;M. Raivonen;M. Vestenius;H. Aaltonen;M. Riederer;J. Bäck |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-7813-2016
|
| URL | |
| Keywords |
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