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. 1982 Jul;151(1):343–350. doi: 10.1128/jb.151.1.343-350.1982

Characteristics of Ti plasmids from broad-host-range and ecologically specific biotype 2 and 3 strains of Agrobacterium tumefaciens.

K L Perry, C I Kado
PMCID: PMC220246  PMID: 7085561

Abstract

Agrobacterium tumefaciens strains isolated from crown gall tumors on grapevines in California were consistently of the biotype 3 group. All 11 of these strains were limited in their host range and harbored Ti plasmids with molecular masses between 119 and 142 megadaltons (Mdal) as well as a larger cryptic plasmid of greater than 200 Mdal; occasionally a smaller cryptic plasmid of 65 Mdal was also present. Ti plasmids o these strains have DNA sequences in common with Ti plasmids of octopine and nopaline strains belonging to the biotype 1 group and exhibited sequence homologies with the conserved region of the T-DNA. Ten of the 11 strains utilized octopine as a sole source of carbon and nitrogen and 3 strains catabolized both octopine and nopaline, whereas 1 strain catabolized only nopaline. All of these strains were resistant to the bacteriocin agrocin-84, except one grapevine strain that belonged to the biotype 1 group and was agrocin sensitive; it is also differed in its plasmid and virulence characteristics. Isolations from Rubus ursinus ollalieberry galls yielded exclusively biotype 2 strains. These strans were insensitive to agrocin-84, utilized nopaline as a sole carbon and nitrogen source, and were highly virulent on all host plants tested. They contained Ti plasmids ranging between 100 and 130 Mdal and occasionally a cryptic plasmid of 69 Mdal. Their Ti plasmids have DNA sequences in common with Ti plasmids of biotype 1 strains and with the conserved region of the T-DNA.

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Selected References

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