ISSN:
1617-4623
Schlagwort(e):
Agrobacterium
;
IS elements
;
Ti plasmid
;
T-region
;
Bacterial evolution
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
Notizen:
Summary A large number of Agrobacterium tumefaciens strains of the biotype III group carry two to ten copies of two related IS elements, IS866 and IS867. A study of the distribution and localization of these elements in 54 strains showed that one IS866 and two IS867 copies are always found at characteristic sites on the octopine/cucumopine and vitopine Ti plasmids, whereas varying amounts of IS866 and IS867 copies occur at different positions on the chromosome. By comparison of the IS patterns, an evolutionary tree could be deduced which shows the phylogenetic relationships between 23 different types of Agrobacterium strains. The structures of the T-regions of the different strains were also compared. Within the octopine/cucumopine group, eight T-region patterns could be defined. These patterns were found to be correlated with the chromosomal IS patterns. This strongly suggests that the IS866 and IS867 containing Ti plasmids are stably associated with their bacterial hosts. The possible role of the IS866 and IS867 elements in Ti plasmid evolution is discussed.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00261170
