Patent ID: 8895805

Claim:
A method for improving insect resistance of a plant, comprising the following steps: transfecting a construct for expressing an insect gene dsRNA into a plant cell, a tissue or an organ, wherein said construct for expressing the insect gene dsRNA is double-stranded, and its sense strand or antisense strand contains a structure as shown in Formula 1: Seq sense -X-Seq antisense Formula 1 wherein, Seq sense is a sense sequence or a fragment of an insect gene, wherein said sense sequence and said fragment are at least 50 bp long; Seq antisense is a sequence or a fragment fully complementary to Seq sense , wherein said sequence and said fragment are at least 50 bp long; X is an intervening sequence between Seq sense and Seq antisense , and said intervening sequence is complementary to neither Seq sense nor Seq antisense , wherein the insect is a Lepidoptera insect, and wherein the insect gene dsRNA can inhibit growth or development of the insect after feeding to the insect, and wherein the insect gene encodes GIP having the amino acid sequence of SEQ ID NO: 2.