HA and gene expression profiles for sporamin , Ib NAC 1 and Ib WRKY 1 in sweet potato leaves. (A-C) Relative expression of sporamin, IbNAC1 and IbWRKY1 transcripts were measured by qRT-PCR analysis in untreated leaves (cK) and leaves damaged by HA. The results are representative of three replicates. Asterisks indicate statistically significant differences. (Dunnett’s multiple comparison test,* represents P < 0.05; ** represents P < 0.01; *** represents P < 0.001; ‘ns’ not significant represents P > 0.05). The results are representative of three replicates.