Abstract
Since the first report of successful gene transfer in 1983, engineered Agrobacterium vectors have been the most widely used means of stable plant transformation. There are host-range limitations to the utility of this approach, however, with most success in dicotyledonous species. Recent evidence has indicated that the host-range is dependent on the protocol used to infect plant tissues with Agrobacterium. Modifications of co-cultivation conditions can lead to successful gene transfer to species once thought beyond the host-range of Agrobacterium, including a number of monocots. Hence, when defining the host-range of Agrobacterium, distinction must be made between host-range for pathogenicity (oncogenicity) and host-range for transformation. Important factors in determining the ability of Agrobacterium to transfer DNA to the plant genome include genetic, physiological and physical components of the bacterium × plant interaction. Simple, empirical experiments with oncogenic strains can yield useful information regarding the importance of co-cultivation conditions. The applications of these to extending the host-range of Agrobacterium for transformation are discussed.
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