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Increase in isoprene and monoterpene emissions after re-watering of droughted Quercus ilex seedlings

Peñuelas, J., Filella, I., Seco, R., Llusià, J.
Biologia plantarum 2009 v.53 no.2 pp. 351-354
Quercus ilex, diurnal variation, drought, emissions, isoprene, leaves, light intensity, monoterpenoids, photosynthesis, seedlings, temperature
We followed the diurnal cycles of isoprenoid emissions from Quercus ilex seedlings under drought and after re-watering. We found that Quercus ilex, generally considered a non-isoprene emitter, also emitted isoprene although at low rates. The emission rates of isoprene reached 0.37 ± 0.02 nmol m⁻² s⁻¹ in controls, 0.15 ± 0.03 nmol m⁻² s⁻¹ under drought and 0.35 ± 0.04 nmol m⁻² s⁻¹ after re-watering, while emission rates of monoterpenes reached 11.0 ± 3.0, 7.0 ± 1.0 and 23.0 ± 5.0 nmol m⁻² s⁻¹, respectively. Emission rates recovered faster after re-watering than photosynthetic rate and followed diurnal changes in irradiance in controls and under drought, but in leaf temperature after re-watering.