Now transformation of multi-genes of insect resistance into plants has been an efficiency measure. It can improve insect resistance, extend different insect resistance ranges and prolong insect resistance times. The pCAMBIA3300 vector carrying multi-genes (CryIA(a)、pta and bar) mediated by Agrobacterium tumefaciens were transferred into calli which derived from mature embryos of three japonica rice varieties (Jijing81?Jijing88 and Tong887). The CryIA(a) and pta genes of the expression vector were drived by ...