Results (
Thai) 1:
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thuringiensis (Bt) is highly toxic to the larvae of thetomato fruit borer, Helicoverpa armigera (Chakrabartiet al., 1998). In the present study, a synthetic cry1Ac genemodi"ed for plant codon usage and having a G#Ccontent of 47.7% was selected for introduction intotomato (Sardana et al., 1996). A. tumefaciens strain LBA4404 carrying pBinBt3 was used to transform tomatocotyledonary explants, and 43 plantlets resistant tokanamycin were regenerated. The e$ciency of transformationwas 8%. Polymerase chain reaction (PCR)analysis of genomic DNAs from the regenerated plantletsusing primers for nptII gene revealed that all the plantswere putative transformants (data not shown). Preliminaryinsect bioassays with the leaves of the transgenicplants using second instar larvae of Helicoverpa armigerarevealed high levels of protection in seven out of 43plants. All subsequent experiments were performed withthese seven plants and their progeny. Genomic DNAsamples from six of these plants were digested with HindIIIand Southern hybridized (Fig. 2). HindIII cuts onlywithin the T-DNA (Fig. 1), just downstream of the Octopinesynthase-poly (A) sequence and so provided informationregarding the insertion position and numberof the transgene copies. The results demonstrated thepresence of more than one copy in all the transgenic
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