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Additional file 1: Table S1. Experimental setup of the chemicals used in each enzymatic assay. In cases where the extract volume added was smaller than 25μL, buffer was added to reach a total extraction volume of 25μL in each well. In every well, the total volume of the reaction was 160 μL.

Additional file 2: Table S2. Activity profile of the nine antioxidant enzymatic signature in different plants and tissue. The values are normalized per mg protein (Mean v [nkat/mg prot]) ± standard deviation; N.D. not detectable. The activities for Arabidopsis leaves, maize leaves and maize roots are average of 3 independent plant replicates whereas for sugar beet roots and barley leaves 3 distinct extractions were performed on the same plant sample, consisting of at least 15 individual plants for barley leaves and 3 plants for sugar beet roots.

Additional file 4: Figure S2. Antioxidant enzymatic activities during salt stress. Nicotiana tabacum plants were grown for 60 days in the greenhouse, thereafter, detached leaves were fed with 0,2M NaCl or 0,5M NaCl via their petioles. Leaves were sampled every two days for a total of 14 days after NaCl application and the enzymatic activities of the 9 antioxidant scavenging enzymes were tested and normalized by protein content. Bars indicate standard deviations of three independent biological replicates.

Additional file 3: Figure S1. Antioxidant enzymatic activities during drought. Nicotiana tabacum plants were grown for 60 days in the greenhouse, thereafter, water was withheld for half of the plants whereas the other half was kept watered. Leaves were harvested every two days for a total of 14 days after watering was stopped and the enzymatic activities of the 9 antioxidant scavenging enzymes were tested and normalized by protein content. Bars indicate standard deviations of three independent biological replicates.