Gene Transfer in Plants
Virulent strains of Agrobacterium contain large Ti-plasmids, which are responsible for the DNA transfer and subsequent disease symptoms. It has been shown that Ti-plasmids contain

two sets of sequence necessary for gene transfer
one set of sequence necessary for gene transfer
four sets of sequence necessary for gene transfer
three sets of sequence necessary for gene transfer

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Gene Transfer in Plants
In a plant tumour cell

complete Ti plasmid is incorporated in plant nuclear DNA
may vary from plant to plant
different parts of the Ti-plasmid are incorporated
only a small specific segment of callus T DNA is incorporated

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