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Evidence of genotype dependency within Agrobacterium tumefaciens in relation to the integration of vector backbone sequence in transgenic Phytophthora infestans-tolerant potato

Paper ID Volume ID Publish Year Pages File Format Full-Text
22265 43264 2009 6 PDF Available
Title
Evidence of genotype dependency within Agrobacterium tumefaciens in relation to the integration of vector backbone sequence in transgenic Phytophthora infestans-tolerant potato
Abstract

In this study the effect of Agrobacterium tumefaciens genotype of two strains AGL1 and LBA4404 was investigated in regard to the propensity for backbone integration during the transformation of potato for blight tolerance conferred by the resistant to blight (RB) gene carried by the vector pCLDO4541. A PCR based walking approach was employed to identify left and right backbone sequences as well as for selected genes carried on the plasmid backbone. It was found that adjacent to the left border insertion site, the integration of backbone sequence was greater for AGL1 than for LBA4404; however, the opposite was observed with regards to the right border T-DNA junction. Considering both T-DNA borders LBA4404 was found to have a two fold greater integration potential for backbone than the AGL1. The possibility of only backbone integration in T-DNA negative plants was also investigated with the average rate of integration between the two strains calculated at 4.2% with LBA4404 recording a three fold greater occurrence of backbone integration than AGL1. In summary, evidence of Agrobacterium genotype dependency showed that LBA4404 has greater potential to integrate non-T-DNA vector sequence than AGL1 and this should be taken into account when utilising the listed A. tumefaciens genotypes in generating transgenic potato. Additionally, the application of a PCR and primer walking system proved to be reliable and allows for fine detailed studies of backbone sequence integration of transgenic plant.

Keywords
Agrobacterium; Transformation; Potato; Transgenic; RB; Backbone integration
First Page Preview
Evidence of genotype dependency within Agrobacterium tumefaciens in relation to the integration of vector backbone sequence in transgenic Phytophthora infestans-tolerant potato
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 107, Issue 3, March 2009, Pages 301–306
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering