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The corn borer is a world-wide agricultural pest. In this study, a full-length neuropeptide F ( npf ) gene in  Ostrinia furnacalis  was sequenced and cloned from a cDNA library, in which the  npf  gene produces two splicing mRNA variants -  npf1  and  npf2  (with a 120 bp segment inserted into the  npf1  sequence to generate  npf2 ). A spatio-temporal expression analysis showed that the highest expression level of  npf  was in the midgut of 5 th  instar larvae (the gluttony period), and their  npf  expression and food consumption were significantly promoted after food deprivation for 6 h. When  npf  was knocked down by double-stranded RNA for NPF, larval food intake, weight and body size were effectively inhibited through changes of a biosynthesis and metabolism pathway;  i.e.  gene silencing of NPF causes decreases of total lipid and glycogen and increases of trehalose production. Moreover, we produced transgenic corn plants with stably expressed dsNPF. Results showed that  O. furnacalis  larvae fed on these transgenic leaves had lower food consumption and smaller body size compared to controls. These results indicate that NPF is important in the feeding control of  O. furnacalis  and valuable for production of potential transgenic corn.

A potential and novel type transgenic corn plant for control of the Corn Borer