IDENTIFICATION AND LOCATION OF THE TOXIN PROTEIN GENES IN 56 BACILLUS THURINGIENSIS ISOLATES
Bt毒素蛋白基因的PCR鉴定及定位

Polymerase chain reaction was performed to screen \?cillus thuringiensis\% isolates for \%cry\%I,\%cry\%III,and \%cry\%V genes with \%cry\%I\|,\%cry\%III\|,and \%cry\%V\| specific primers respectively.The results indicated that,in the 56 Bt isolates examined,7 isolates contain \%cry\%I gene,2 isoltaes contain \%cry\%III gene,and 21 isolates contain both \%cry\%I and \%cry\%V genes.The \%cry\%V gene was located by Southern hybridization in the large plasmid of about 150MD molecular mass.