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Báo cáo lâm nghiệp:"The influence of microclimate and tree age on the defense capacity of European beech (Fagus sylvatica L. ) against oxidative stress"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:"The influence of microclimate and tree age on the defense capacity of European beech (Fagus sylvatica L. ) against oxidative stress" | Ann. For. Sci. 60 2003 131-135 INRA EDP Sciences 2003 DOI 10.1051 forest 2003005 131 Original article The influence of microclimate and tree age on the defense capacity of European beech Fagus sylvatica L. against oxidative stress Gerhard Wiesera Karin Heckeb Michael Tauszb Karl-Heinz Hăberlec Thorsten E.E. Gramsc and Rainer Matyssekc a Bundesamt und Forschungszentrum fur Wald Abt. Forstpflanzenphysiologie Rennweg 1 6020 Innsbruck Austria b Institute of Plant Physiology Karl-Franzens University Graz SchubertstraBe 51 8010 Graz Austria c Department of Ecology Ecophysiology of Plants Technische Universităt Munchen Am Hochanger 13 85354 Freising Germany Received 1 March 2002 accepted 17 May 2002 Abstract - Microclimate and tree age have been suggested to be factors influencing the defense capacity against oxidative stress. Therefore 5-year-old Fagus sylvatica seedlings were grown on a scaffolding in the sun and shade crown of 55-year-old trees throughout one growing season. Independent of tree age sun leaves had a lower specific leaf area lower pigment contents and a more capacitive antioxidative system than shade leaves. In addition in the sun crown leaves of seedlings displayed a higher specific leaf area than leaves of adult trees. Age dependent changes in leaf morphology were related to changes in the defense capacity against oxidative stress with area based concentrations of antioxidants and pigments increasing with tree age. Thus our results suggest that differences in the response to oxidative stress may be attributed to age and crown position related differences in the specific leaf area the latter influencing the biochemical and physiological performance of Fagus sylvatica leaves. Fagus sylvatica tree age exposure to light antioxidative defense specific leaf area Résumé - L influence du microclimat et de l âge de l arbre sur la capacité défensive du hêtre européen Fagus sylvatica L. contre le stress oxidatif. Le microclimat et l âge de l arbre sont considerés