Review. Leaf morphogenesis in Streptocarpus -- Genetics. DNA Replication in Plants. The Importance of Cell Patterning in Plant Development. Fruit Development -- Physiology. Adaptation to a Changing Environment: The Regulatory Role of Small RNAs. Growth Responses to Changing Light Environment. Algae Viruses: A Newly Discovered World. The Role of Auxin in Plant-Microbe Interactions. Molecular Mechanism of Water and Gas Transport Across Biological Membranes and Consequences for Plant Physiology -- Systematics. Reconciling Molecular with Morphological Data - Progress in Lichen Systematics and Phylogeny -- Ecology. Systemic resistance induction mediated by vascular and airborne signalling. The functions of roots. Allometry of tree size and crown shape as a result of internal matter allocation and external mechanical abrasion. Physiological ecology of aspen. Development of forest refuge biocoenoses during glacial times.

With one volume each year, this series keeps scientists and advanced students informed of the latest developments and results in all areas of the plant sciences. The present volume includes reviews on genetics, cell biology, physiology, comparative morphology, systematics, ecology, and vegetation science.