Acetaldehyde emission by the leaves of trees - correlation with physiological and environmental parameters

The leaves of trees emit significant amounts of acetaldehyde tion of CAT by aminotriazole did not affect acetaldehyde and which is synthesized there by the oxidation of ethanol. In the ethanol emission, it is concluded that the oxidation of ethanol present study, we examined plant internal and environmental in the leaves is mediated by ADH rather than by CAT. factors controlling the emission of acetaldehyde by the leaves Further studies indicated that aldehyde dehydrogenase of young poplar (Populus tremula×P. alba) trees. The en- (ALDH; EC 1.2.1.5) seems to be responsible for the oxidation zymes possibly involved in the oxidation of ethanol in the of acetaldehyde. The present results demonstrate that acetaldehyde emission is clearly dependent on its production in the leaves of trees are catalase (CAT; EC 1.11.1.6) and alcohol dehydrogenase (ADH; EC 1.1.1.1), both expressed constitu- leaves as controlled by the delivery of ethanol to the leaves via tively in the leaves of poplars. Inhibition of ADH in excised the transpiration stream. Environmental factors that control stomatal conductance seem to be of less importance for leaves caused a significant decrease of acetaldehyde emission accompanied by an increased ethanol emission. Since inhibi- acetaldehyde emission by the leaves.

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