General -- to allelopathy -- Basic pathways for the origin of allelopathic compounds -- Methodological Aspects -- Clues in the search for new herbicides -- Distinguishing allelopathy from resource competition: the role of density -- Toxicity in allelopathy: In Silico Approach -- Physiological Aspects of Allelopathy -- Allelochemicals and photosynthesis -- Cell cycle analyses for understanding growth inhibition -- Detoxification of allelochemicals-The case of bezoxazolin-2(3H)-one(BOA) -- Allelopathy and abiotic stress -- Allelopathy and biotic stresses -- Plant secondary metabolites.Targets and mechanisms of allelopathy -- Mitochondria as a site of allelochemical action -- Ecophysiology and Allelopathy -- Weed germination,seedling growth and theirlesson for allelopathy in agriculture -- Allelopathy: A soil system perspective -- Microorganisms and allelopathy: A one-sided approach -- Ecological Aspects of Allelopathy -- Ecological relationships and Allelopathy -- Resistance and susceptibility of plant communities to invasion:revisiting Rabotnov's ideas about community homestasis -- Allelopathy in Different Environments -- Allelopathy in marine ecosystems -- Allelopathy in aquatic environments -- Forest ecosystems and allelopathy -- Allelopathic interactions in agroecosystems -- Applied Apsects of Allelopathy -- Playing with chemistry: studies on Orobanche spp. Germination stimulants -- Modes of action of phytotoxins from plants -- Allelopathy in ecological sustainable agriculture -- Parasitic weeds and allelopathy:from the hypothesis to the proofs. This book provides the reader relevant information about actual knowledge about the process of allelopathy, covering all aspects from the molecular to the ecological level. Special relevance is given to the physiological and ecophysiological aspects of allelopathy. Several ecosystems are studied and methodological considerations are taken into account in several different chapters. The book has been written to be useful both for Ph.D. students and for senior researchers, so the chapters include all necessary information to be read by beginners, but they also include a lot of useful information and discussion for the initiated.