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. 1995 Aug;61(8):2879–2884. doi: 10.1128/aem.61.8.2879-2884.1995

Universal PCR primers for detection of phytopathogenic Agrobacterium strains.

J H Haas 1, L W Moore 1, W Ream 1, S Manulis 1
PMCID: PMC167564  PMID: 7487020

Abstract

Two PCR primer pairs, based on the virD2 and ipt genes, detected a wide variety of pathogenic Agrobacterium strains. The endonuclease domain of VirD2 protein, which cleaves transferred DNA (T-DNA) border sequences, is highly conserved; primer oligonucleotides specific for the endonuclease portion of virD2 detected all pathogenic strains of Agrobacterium tested. PCR primers corresponding to conserved sequences in ipt, the T-DNA-borne cytokinin synthesis gene, detected only Agrobacterium tumefaciens and distinguished it from Agrobacterium rhizogenes. The virD2 and ipt primer pairs did not interfere with each other when included in the same PCR amplification, and this permitted simultaneous detection of both genes in a single reaction. One nonpathogenic Agrobacterium radiobacter strain contained virD2 but not ipt; we speculate that this strain arose from a pathogenic progenitor through a deletion in the T-DNA. The virD2 primer pair appears to be universal for all pathogenic Agrobacterium species; used together, the primer sets reported here should allow unambiguous identification of Ti plasmid DNA in bacteria isolated from soil and plants.

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Selected References

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