Figure 1From: Differential activation of sporamin expression in response to abiotic mechanical wounding and biotic herbivore attack in the sweet potatoIn vitro antioxidant studies of sweet potato leaves damaged by MW and HA. The third leaves of sweet potato plants were sampled at 0.25, 0.5 and 6 h after treatment with MW or HA. (A) The total phenolic content was measured at 725 nm and is expressed in gallic acid (GAE) equivalents; (B) The DPPH activity was measured at 517 nm using ascorbic acid as a standard, and the EC50 was calculated; (C) The SOD activity was measured at 560 nm and defined as the amount of enzyme that resulted in 50% NBT inhibition; (D-F) The catalase activity (D), POD activity (E) and H2O2 level (F) were measured using the TMB (3,3′,5,5′-tetramethylbenzidine) method. Data are means (±SE) of three independent experiments with three replicates. (* represents P < 0.05; ** represents P < 0.01; *** represents P < 0.001; ‘ns’ represents P > 0.05). DPPH: 2, 2-diphenyl-1-picrylhydrazyl; POD: peroxidase; SOD: superoxide dismutase.Back to article page