Phenolic compounds seem to play a major and dynamic role as antioxidants in response to moderate

increase of atmospheric ozone. Many of the above-mentioned articles deal with various stresses that are accompanied by an oxidative burst, and so we found it desirable to include an article that discusses the various antioxidant systems in trees (especially poplar) and compares them to herbaceous plants. This is described in the last article of this volume by Chibani et al. entitled ‘The selleck inhibitor chloroplastic thiol reducing systems: dual functions in the regulation of carbohydrate metabolism and regeneration of antioxidant enzymes, emphasis on the poplar redoxin equipment’. This article focuses in particular on two multigenic families (thioredoxins and glutaredoxins) and associated protein partners in poplar and on their involvement in the regulation of some major chloroplastic processes such as stress response, carbohydrate and heme/chlorophyll

metabolism. We believe that this volume devoted especially to stress and photosynthesis in poplar is the first of the kind. We thank all the authors who have willingly contributed to it and hope that together these articles will be precious to the poplar community but also more widely to the photosynthetic community. Reference Tuskan GA, Difazio S, Jansson S, Bohlmann J, Grigoriev I, Hellsten U, Putnam N, Ralph S, Rombauts S, Salamov A, Schein J, Sterck L, Aerts A, Bhalerao RR, Bhalerao RP, Blaudez D, Boerjan W, Brun A, Brunner A, Busov V, Campbell M, Carlson J, Chalot M, Chapman J, Chen GL,

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“The discovery of the plastoquinone Plastoquinone (PQ) was discovered by Kofler (1946) during a search for compounds with Vitamin K activity in alfalfa.