Abstract
The conjugative behaviour of nopaline and agropine Ti-plasmids has been investigated. Using a technique which avoids enrichment of transconjugants on a mating medium we have shown that preculture in the presence of agrocinopines A or B of donor strains harbouring nopaline Ti plasmids promotes plasmid transfer whereas preculture of the same strains in the presence of nopaline has no such effect. Similarly, preculture in the presence of agrocinopines C or D promotes Ti-plasmid transfer from strains harbouring agropine Ti-plasmids.
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