Review -- A Journey with Plant Cell Division: Reflection at My Halfway Stop -- Genetics -- Replication of Nuclear DNA -- Transformations of Cellular Pattern: Progress in the Analysis of Stomatal Cellular Complexes Using L-Systems -- Endoreduplication and Growth of Fleshy Fruits -- Physiology -- Adaptation to a Changing Environment: The Regulatory Role of Small RNAs -- Growth Responses of Trees to Arctic Light Environment -- Initial Events Associated with Virus PBCV-1 Infection of NC64A -- The Role of Auxin in Root-Symbiont and Root-Pathogen Interactions: From Development to Defense -- Molecular Mechanism of Water and Gas Transport Across Biological Membranes and Consequences for Plant Physiology -- Systematics -- Lichen Systematics: The Role of Morphological and Molecular Data to Reconstruct Phylogenetic Relationships -- Ecology -- Systemic Resistance Induction by Vascular and Airborne Signaling -- Roots: The Acquisition of Water and Nutrients from the Heterogeneous Soil Environment -- Re-Evaluation of Allometry: State-of-the-Art and Perspective Regarding Individuals and Stands of Woody Plants -- Quaking Aspen's Current and Future Status in Western North America: The Role of Succession, Climate, Biotic Agents and Its Clonal Nature -- Quaternary Palaeoecology of East and Southeast Asia and of the Pacific Ocean. 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.