Preface. Section I: Basic Tree Physiology. Cambial cell biology comes of age; N. Chaffey. Physiology of cambial growth, storage of reserves and heartwood formation; E. Magel. Insights into bud development and dormancy in poplar; A. Rohde, W. Boerjan. Physiology of tree root/fungus symbiosis; R. Hampp, U. Nehls. Section II: Stress Physiology. Understanding the role of ozone stress in altering belowground processes; C.P. Andersen. Ozone-induced cell death; J. Kangasjärvi, et al. Signalling and antioxidant defence mechanisms in higher plants; S. Karpinski, et al. Effect of ozone on conifers in the timberline ecotone; G. Wieser, W. Havranek. Ageing as an influence on tree response to ozone: theory and observations; T.E. Kolb. Ozone and UV-B responses of trees and the question of forest sustainability; C. Langebartels, et al. Investigations on the action of fungal toxins on plants; W. Oßwald, et al. Section III: Trees and Their Environment. Effects of atmospheric CO2 on growth and branchines of different poplar (Populus) genotypes in the POPFACE experiment; B. Cielen, et al. Biotic interactions; W. Beyschlag. The influence of the environment during sexual reproduction on adaptations of conifers along latitudinal and altitudinal gradients; Ø. Johnsen, T. Skrøppa. Section IV: Fugure Aspects of Tree Physiology. Tree physiology goes genomics; B. Sundberg. Water, nutrients and carbon; altitude and ageing; P.G. Jarvis, et al. Trends in forest tree physiological research; R. Matyssek. Author index. Index.