How the host specificity is achieved by the specificity gene of the Ti plasmid?

How the host specificity is achieved by the specificity gene of the Ti plasmid? Correct Answer Acetosringone released by a wounded part of the plant

Acetosringone is released by the wounded part of the plant. This chemical is identified by the host specificity gene of the bacteria A. tumefaciens which then infects the plant through the wounded area.

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In the broad host-range plasmid Psc101, close to the origin, there is a gene repA. What is the importance of this gene?
Once a plasmid has incorporated specific genes, such as the gene coding for the antibiotic ampicillin, into its genome, the plasmid may be cloned by