Abstract
The relationship between the limited host range octopine Ti plasmids and the wide host range octopine Ti plasmids pTiB6806 and pTiA6 was studied. The limited host range Ti plasmids shared extensive deoxyribonucleic acid homology; pTiAg63 and pTiAg162 were essentially completely homologous with pTiAg158 while pTiAg57 shared approximately 64% homology with pTiAg158. In contrast, the limited host range octopine Ti plasmids only shared 6 to 15% homology with the wide host range octopine Ti plasmid pTiB6806. Thus, limited and wide host range octopine Ti plasmids comprise distinct families of plasmids. The deoxyribonucleic acid homology shared between the limited host range Ti plasmids and pTiB6806, however, was distributed over some 50% of pTiB6806, suggesting that both families of plasmids evolved from a common progenitor plasmid. The limited host range Ti plasmids showed relatively strong homology with pTiB6806 HpaI fragment 7, a region which codes for octopine utilization by the bacterium, but showed only weak homology with pTiB6806 HpaI fragment 12, a region required for virulence. In addition, homology between the limited host range octopine Ti plasmids and the "common deoxyribonucleic acid," sequences shown to have a central role in plant cell transformation, was barely detectable when stringent hybridization conditions were used. We therefore conclude that a highly conserved version of the common deoxyribonucleic acid is not required for crown gall tumorigenesis on all plant species.
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Selected References
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