Cloning and expression of gene crtb from erwinia uredovora in escherichia coli 基因的克隆及在大肠杆菌中的表达
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Using erwinia carotovora strain scg1 as pathogen , the effect of b . thuringiensis strain 4d1 culture was detected on the rot soft disease . the results indicated that 4d1 culture inhibited the pathogenicity of scg1 in 24 hours when the cell density of scg1 was lower than odeoonm = 0 . 55 , but when the incubation time after infection was longer than 24 hours , the effect decreased 以胡萝卜软腐欧文氏菌菌株scg1为例，当菌株scg1的细胞浓度od _ ( 600nm ) < 0 . 55时，经苏云金芽胞杆菌菌株4d1培养物处理后感染马铃薯，在24小时内，可完全抑制软腐病斑，但随着培养时间的延长，其抑制作用逐渐减弱。
