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Transformation and Regeneration of Dicotyledonous Plants

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The formation of crown galls on many dicotyledonous plants, as a result of Agrobacterium tumefaciens infection, has been well documented (1 ). The transfer of a small T-DNA region of the Ti plasmid to the nuclear genome of the plant host (2 ) and expression of the T-DNA growth hormone genes are responsible for the unorganized habit characteristic of crown gall tumors (3 ). Originally, it was thought that only dicotyledonous species could be infected, but a number of reports have recently suggested that monocotyledonous species may also be transformed by this means (4 7 ).
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