Over the last decade plant biologists have become increasingly aware of the importance and complexities of interactions between the environment and plant physiological processes. This book considers the integrated effects of a large amount of variables on the photosynthetic processes of plants growing in a range of contrasting environments, each presenting a different set of ecophysiological problems to plants. The papers describe the characteristic physico-chemical features of the environment and provide an up-to-date account of the knowledge of plant photosynthetic performance in that environment in terms of the constraints imposed by climatic and edaphic parameters and adaptations.