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. 1985 Dec 1;4(12):3069–3077. doi: 10.1002/j.1460-2075.1985.tb04047.x

Isolation and identification of TL-DNA/plant junctions in Convolvulus arvensis transformed by Agrobacterium rhizogenes strain A4

Jerry L Slightom 1,3, Lise Jouanin 2, Francesca Leach 2, Roger F Drong 1,3, David Tepfer 2
PMCID: PMC554624  PMID: 16453649

Abstract

We have constructed a Charon 4A phage library containing insert DNA isolated from a morning glory (Convolvulus arvensis) plant (clone 7) regenerated from a root organ culture incited by Agrobacterium rhizogenes, strain A4. Using a subcloned region of the Ri plasmid as 32P-labeled probe, two lambda clones containing most of the 'left' T-DNA (TL) region were isolated. One of these lambda clones contains the left TL-DNA/plant junction, which was located by comparing nucleotide sequences from the appropriate regions of the Ri plasmid and this lambda clone. A 25-bp sequence found near this left TL-DNA/plant junction matches the 25-bp terminal sequence found at or near T-DNA/plant junctions of both nopaline- and octopine-type A. tumefaciens Ti plasmids. A possible location for the right Ri TL-DNA/plant junction in C. arvensis clone 7 was found by obtaining the nucleotide sequence surrounding its mapped location. Hybridization of plant DNA found adjacent to the left TL-DNA/plant junction against total C. arvensis DNA shows that this T-DNA integration occurred in a plant DNA region that does not contain highly repetitive DNA sequences. Nucleotide sequence analysis of 1004 bp of this plant DNA revealed no complete or partial open reading frames, but this plant DNA does have the potential to form various secondary structures which might play a role in the T-DNA integration event.

Keywords: Agrobacterium rhizogenes, lambda cloning, nucleotide sequence, plant DNA, secondary structures

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Selected References

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