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Agrobacterium rhizogenes induces root formation and inserts a fragment of its plasmid into the genome of infected plants. A part of the transferred region (TL-region) of the Ri plasmid of A. rhizogenes strain A4 was cloned in pBR322. Insertions of the Escherichia coli lacZ coding region into the hybrid plasmids were made in vivo using mini-Mu-duction. Two mini-Mus were used, one with the Mu A and B transposase genes (MudII1681) and the other without (MudII1734). Two inserts which result in E. coli lacZ expression where shown to be located in the T-DNA region. This indicates that portions of the T-DNA are capable of expression in bacteria. When these two hybrid plasmids were transformed into Agrobacterium only the one harboring MudII1734 insert gave transformants which correspond to homologous recombination. These results indicate that gene fusion and insertion directed mutagenesis can be simultaneously obtained with this mini-Mu and could be used to study Agrobacterium gene expression.
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