OBTAINING OF COWPEA PROTEINASE INHIBITOR TRANSGENIC POPULUS TOMENTOSA Transformation of Populus tomentosa with Insecticidal Cowpea Proteinase Inhibitor Gene An Insect-Resistant Transgenic Cabbage Plant with Cowpea Trypsin Inhibitor(CpTI) Gene CURRENT SITUATION OF THE IDENTIFICATION, SELECTION, AND APPLICATION OF RESISTANT COTTON CULTIVAR AGAINST COTTON INSECT PESTS IN CHINA ON THE RESISTANCE OF CpTI TRANSGENIC TOBACCO PLANTS TO COTTON BOLL WORM