Abstract
We have identified T-DNA tagged Arabidopsis mutants that are resistant to transformation by Agrobacterium tumefaciens (rat mutants). These mutants are highly recalcitrant to the induction of both crown gall tumors and phosphinothricin-resistant calli. The results of transient GUS (β-glucuronidase) assays suggest that some of these mutants are blocked at an early step in the Agrobacterium-mediated transformation process, whereas others are blocked at a step subsequent to translocation of T-DNA into the nucleus. Attachment of Agrobacterium to roots of the mutants rat1 and rat3 was decreased under various incubation conditions. In most mutants, the transformation-deficient phenotype co-segregated with the kanamycin resistance encoded by the mutagenizing T-DNA. In crosses with susceptible wild-type plants, the resistance phenotype of many of these mutants segregated either as a semi-dominant or dominant trait.
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Received: 26 October 1998 / Accepted: 8 January 1999
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Nam, J., Mysore, K., Zheng, C. et al. Identification of T-DNA tagged Arabidopsis mutants that are resistant to transformation by Agrobacterium . Mol Gen Genet 261, 429–438 (1999). https://doi.org/10.1007/s004380050985
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DOI: https://doi.org/10.1007/s004380050985