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Agrobacterium tumefaciens-mediated genetic transformation of rye (Secale cereale L.)

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Abstract

A system for the genetic transformation of rye by co-cultivation with Agrobacterium tumefaciens is described. A total of 45 independent transgenic plants were regenerated with a transformation efficiency of 1 to % of the inoculated explants. The co-cultivation of Agrobacterium-strain AGL0, harboring plasmid pJFnptII and rye im-mature embryos in liquid medium allowed a high throughput and facilitated washing of the cultures to avoid Agrobacterium overgrowth. Transgenic plants were phenotypically normal and fully fertile, which might be aconsequence of the short time in tissue culture. The selection with paromomycin exclusively during the regen-eration allowed the efficient recovery of transgenic events without interfering with somatic embryogenesis. Southern blot analysis confirmed the independent nature of the analyzed plants and indicated single copy inserts in more than 50% of them. Segregation analysis confirmed single locus integration and stable transgene expression in most of the lines, while one line with multiple locus integration was also observed. The analysis of T-DNA:: plant DNA boundary sequences revealed examples of exclusion of vector sequences, deletion of a few bases of the T-DNA or insertion of up to 29 bases of the vector backbone. This stresses the importance of detailed analysis of the inserted transgenes in order to identify events with the desired integration profile.

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Authors and Affiliations

  1. Institut für Pflanzengenetik und Kulturpflanzenforschung Gatersleben, Corrensstrasse 3, Gatersleben, 06466, Germany

    Juan Carlos Popelka

  2. Agronomy Department, Laboratory of Molecular Plant Physiology, University of Florida, IFAS, 2191 McCarty Hall, P.O. Box 110300, Gainesville, FL, 32611-0300, USA

    Fredy Altpeter

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  1. Juan Carlos Popelka
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  2. Fredy Altpeter
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Popelka, J.C., Altpeter, F. Agrobacterium tumefaciens-mediated genetic transformation of rye (Secale cereale L.). Molecular Breeding 11, 203–211 (2003). https://doi.org/10.1023/A:1022876318276

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