Molecular and genetic analysis of the transferred DNA regions of the root-inducing plasmid of Agrobacterium rhizogenes.
The T-DNA regions of the root-inducing (Ri) plasmid pRiA4b of Agrobacterium rhizogenes were characterized. Two regions, designated TL-DNA and TR-DNA, were found to be integrated and stably maintained in the plant genome. The TL-DNA spanned a 15- to 20-kilobase region of pRiA4b and was separated from the TR-DNA region by at least 15 kilobases of nonintegrated plasmid DNA. The TR-DNA region also spanned a 15- to 20-kilobase region of pRiA4b and included a region of homology to the tms morphogenic loci of the tumor-inducing (Ti) plasmid of Agrobacterium tumefaciens. Eighteen deletions and 95 transposon insertions were generated in the T-DNA regions and tested for alterations in virulence. Insertions into four loci in the TL-DNA affected the morphology of root formation of Kalanchoë diagremontiana leaves and stems, but had no visible effects on other host plants. Insertions into two loci (tms-1 and tms-2) in the TR-DNA eliminated virulence symptoms on all plants tested, with the exception of K. diagremontiana stems, where sparse root formation occurred. Complementation experiments with Ri and Ti plasmid T-DNA mutations indicate that the tms genes of the two plasmids serve similar functions and suggest a functional relationship between one or more genes of the TL-DNA and the cytokinin synthesis locus tmr of the Ti plasmid.
D002872:Chromosome Deletion; D004269:DNA, Bacterial / Q000032:analysis*; D005816:Genetic Complementation Test; D009154:Mutation; D009693:Nucleic Acid Hybridization; D010941:Plant Tumors; D010957:Plasmids; D012231:Rhizobium / Q000235:genetics* / Q000472:pathogenicity; D014774:Virulence
D004269:DNA, Bacterial