Abstract
Gene transfer to the monocotyledon tulip (Tulipa sp. L.) was obtained both by particle bombardment and Agrobacterium transformation. Using a Particle Delivery System, transient expression of the reporter gene for ßglucuronidase was demonstrated. It was shown that the CAMV 35S as well as the TR2' promoter were active in flower stem expiants. Various wildtype and disarmed Agrobacterium strains, harbouring the 35S GUSintron gene on a binary plasmid, were used for infection of flower stem expiants of 7 cultivars and 7 botanical Tulipa species. In nine genotypes the GUSintron gene was expressed, despite the fact that tulip tissue did not produce detectable amounts of virulence-inducing substances. Agrobacterium rhizogenes appeared to be most effective in gene transfer to tulip tissue.
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