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Isolation of a recombination deficient Agrobacterium tumefaciens mutant

✍ Scribed by Klapwijk, P. M. ;van Beelen, P. ;Schilperoort, R. A.

Publisher: Springer
Year: 1979
Tongue: English
Weight: 423 KB
Volume: 173
Category: Article
ISSN: 0026-8925
DOI: 10.1007/bf00330307

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✦ Synopsis

The isolation of a recombination deficient (Rec-) strain of Agrobacterium tumefaciens is described. Strain LBA 4011 was mutagenized with nitrosoguanidine and after segregation 18,000 colonies were replica plated and UV irradiated. Twentytwo UV sensitive strains were isolated and tested for methylmethanesulphonate (MMS) sensitivity. Six of these strains were more MMS-sensitive than LBA 4011. A Ti plasmid that was genetically marked with Tn 1 (CbR) was introduced in these strains and the rescue of the CbR marker during superinfection with an incompatible cointegrate plasmid Ti::R 702 was determined. One strain exhibited a large reduction in rescue frequency. It is concluded that the latter strain was recombination deficient. This property did not influence the induction of plant tumours.

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