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Allelopathy is new emerging science, which indicates inhibitory or stimulatory biochemical interactions between the two plant species. Prof. Hans Molisch, a German Plant Physiologist coined this term in 1937. International Allelopathy Society in 1996 broadened its definition as any process involving secondary metabolites produced by plants, microorganisms, viruses and fungi.Agricultural and Biological Systems. Trees are the most dominant form of vegetation in phyto-community Allelochemicals released from trees either in atmosphere (volatilization) or in soil (root exudation and ...

There are many disciplines associated with taxonomy which are used by taxonomists as an aid or to improve the identification, classification and to remove existing taxonomic confusions. Among these disciplines palynology is one of the most significant tool used by modern taxonomists to identify and differentiate closely related taxas. Pollen characters have received great attention in taxonomic classification as they show more stability in their characters than morphology. The significance of pollen morphology in plant systematic has been stressed by a number of workers to delineate different...