Review. Chromatophore Displacements in Marine Macroalgae: Physiology and Ecological Relevance.- Genetics. Alternative Respiration in Plants and Fungi: Some Aspects of Its Biological Role. Mutants and Transgenics -- a Comparison of Barley Resources in Crop Breeding. Molecular Genetics of Chloroplast Biogenesis. Extranuclear Inheritance: Genetics and Biogenesis of Mitochondria. Genetics of Phytopathogenic Bacteria. Population Genetics: Aspects of Biodiversity. Strategies of Breeding for Durable Disease Resistance in Cereals.- Physiology. Coordination of V-ATPase and V-PPase at the Vacuolar Membrane of Plant Cells. Ca2+ Mobilization from Internal Stores in Electrical Membrane Excitation in Chara. Photosynthesis. Carbon Metabolism: Quantification and Manipulation. Light Sensory Responses in Lower Plants: Photomovement Versus Photoadaptation. Circadian Rhythmicity: Is the Biological Clock' Hardware or Software?- Systematics. Systematics of the Pteridophytes.- Ecology. Impact of Ozone on Trees: an Ecophysiological Perspective. Fine Root Biomass of Temperate Forests in Relation to Soil Acidity and Fertility, Climate, Age and Species. Light Heterogeneity and Plants: from Ecophysiology to Species Coexistence and Biodiversity. Applications of Stable Isotopes in Plant Ecology. Trends in Plant Diversity Research.-