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We have developed a sensitive leaf disc transformation procedure for studying early and/or transient T-DNA expression duringAgrobacterium tumefaciens -mediated transformation of plant cells. Using this system, we have examined the function of T-DNA border sequences on the early expression of T-DNA genes and on the stable integration of those genes in infected cells. Deletion of the right border from the T-DNA appears to permit transfer of T-DNA genes from the tumor-inducing (Ti) plasmid but greatly reduces the frequency of their stable integration. A binary vector has been constructed to permit examination of T-DNA border function intrans to the Ti plasmid. In this situation, a single T-DNA border is necessary for early expression of T-DNA genes and is sufficient for stable integration in any orientation.

Rapid assay of foreign gene expression in leaf discs transformed by Agrobacterium tumefaciens : Role of T-DNA borders in the transfer process