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Ochratoxin A (OTA) is a toxin produced by Aspergillus and Penicillum moulds. Since OTA has not yet been evaluated in plant systems, this paper focused on describing the controversial effect OTA in an Allium root test model, which has known sensitivity to genotoxins and could be useful in toxin screening. Analyses of root growth and the root meristematic zone in response to OTA treatment were undertaken...