Spider insecticidal protein (SIP) gene can encode a small polypeptide containing 37 amino acids. The polypeptide has strong toxicity to many insects. Plasmid pBBBast-PinII has the Potato proteinase inhibitor II (Pin II ) gene which encodes potato proteinase inhibitor. The SIP gene was digested by restriction enzyme Hindlll and inserted into the vector pBBBast-Pin II . So a plant expression vector with two insect-resistant genes -pBBBast-Pin II -SIP was constructed. A plant expression vector - pB...