QRT-PCR analysis of the sporamin, Ib NAC 1 and Ib WRKY 1 transcript after different wounding treatments. Relative expression of sporamin, IbNAC1 and IbWRKY1 expression were measured by qRT-PCR in untreated (cK) and mechanically wounded (MW) sweet potato leaves at the indicated time points. Ubiquitin (UBQ) gene was used as an internal control. (* 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.