Second, five plant binary expression vectors pNAR501, pNAR502 and pNAR503 et al driven by CaMV35S constitute promoter were constructed respectively according to the structure characteristics of open reading frame of Pib gene.

• 其次根据Pib基因的结构特点，将Pib结构基因克隆进双元载体构建了5个植物表达载体pNAR501、pNAR502、pNAR503等，这5个载体分别由35S驱动。