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Interactions between Drought and O 3 Stress in Forest Trees
Author(s) -
Matyssek R.,
Le Thiec D.,
Löw M.,
Dizengremel P.,
Nunn A. J.,
Häberle K.H.
Publication year - 2006
Publication title -
plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 1435-8603
DOI - 10.1055/s-2005-873025
Subject(s) - biology , drought tolerance , drought stress , climate change , acclimatization , agronomy , botany , ecology
Abstract: Temperature increase and altered precipitation are facets of “Global Change”, along with enhanced tropospheric ozone (O 3 ) and CO 2 levels. Both O 3 and drought may curtail the probably limited capacity of “extra” carbon fixation in forest trees under a CO 2 ‐enriched atmosphere. In view of the exceptionally dry year of 2003 in Central Europe, this mini‐review highlights O 3 /drought interactions in biochemical and ecophysiological responses of trees. Such interactions appear to vary, depending on the genotype and factorial scenarios. If O 3 perturbs stomatal regulation, tolerance to both drought and persisting O 3 exposure may be weakened, although drought preceding O 3 stress may “harden” against O 3 impact. Stomatal closure under drought may shield trees against O 3 uptake and injury, which indeed was the case in 2003. However, the trees “tuning” between O 3 uptake and defence capacity is crucial in stress tolerance. Defence may be constrained due to limited carbon fixation, which results from the trade‐off with O 3 exclusion upon stomatal closure. Drought may cause a stronger reduction in stem growth than does ozone on an annual basis.