In this work we exposed the rice plant (Oriza sativa)to A. ovalisporum and M. aeruginosa cell extracts, in an attempt to mimic a putative situation in the natural environment in which plants are grown in fields contaminated with toxic cyanobacteria blooms or irrigated with contaminated water. The adverse effects on rice plants were determined by measuring parameters of plant growth such as tissue fresh weight and dry weight as well as the activity of glutathione S-transferase (GST) and glutathione per-oxidase (GPx) were registered to assess the plant physiological condition. An ecological relevant concentration (2.5 mg CYN/L) was used and the effects analyzed up to 9 days of exposure. The potential synergic effects of simultaneous exposure to CYN and MC were also assessed