The T-DNA Genes of Agrobacterium Plasmids Appear to be of a Complex Evolutionary Origin
Crown galls are typical neoplasmic tissues of plants. These plant tumours are the result of a complex interaction between susceptible plants and gram-negative bacteria (Agrobacterium turnefaciens). During this interaction a defined segment (T-DNA) of a large extrachromosomal plasmid harbored by Agrobacteria (Ti-plasmid) is transferred from the bacteria to the nucleus of infected plant cells. The transferred DNA segment is stably integrated in one of many possible loci on different chromosomes (for recent reviews see Caplan et al., 1983; Gheysen et al., 1985; Nester et al., 1984; Helle et al., 1984).
KeywordsAgrobacterium Tumefaciens Crown Gall Active Auxin Cytokinin Biosynthesis Crown Gall Tumor
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