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    Chloroplast transformation in plants: polyethylene glycol (PEG) treatment of protoplasts is an alternative to biolistic delivery systems


    O'Neill, Carmel and Horvath, Gabor V. and Horvath, Eva and Dix, Philip and Medgyesy, Peter (1993) Chloroplast transformation in plants: polyethylene glycol (PEG) treatment of protoplasts is an alternative to biolistic delivery systems. The Plant Journal, 3 (5). pp. 729-738. ISSN 0960-7412

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    Abstract

    Nicotiana plumbaginifolia protoplasts were directly transformed by PEG treatment with a cloned 16S rRNA gene isolated from a double antibiotic-resistant Nicotiana tabacum plastid mutant. Putative plastid transformants were selected in cell culture by their spectinomycin resistance and identified by their unselected streptomycin resistance. Alternatively, cell lines were selected in the presence of both antibiotics. The cell line (and its regenerated plants) selected solely for spectinomycin resistance demonstrated an extensive segregation of streptomycin resistance in subsequent tests, while the double-selected line showed stable resistance for both antibiotics. The resistance markers were inherited maternally. In the putative plastid transformants the origin of the resistance mutations was identified by the absence of an AatII site, missing in the donor N. tabacum plastid gene (spectinomycin resistance site) but present in that of wild-type N. plumbaginifolia, and a sequence analysis of the particular nucleotide changes in both resistance sites. Restriction enzyme analysis of total plastid DNA (ptDNA), and the recloning and full sequencing of the fragment introduced, investigated in one of the plastid transformants, showed no DNA rearrangements accompanied with the integration process. Sequence analysis indicated a targeted, homologous integration of the DNA fragment introduced but an unexpectedly complete homology of the parental ptDNA sequences in this region prevented the location of borders. Although the frequency of plastid transformant colonies (2 x 10(-5)) should still be improved, this method for stable chloroplast DNA transformation is comparable with or more efficient than the particle bombardment techniques.

    Item Type: Article
    Keywords: Chloroplast; transformation; plants; polyethylene glycol; PEG; protoplasts;
    Academic Unit: Faculty of Science and Engineering > Biology
    Item ID: 7361
    Identification Number: https://doi.org/10.1111/j.1365-313X.1993.00729.x
    Depositing User: Prof. Philip J. Dix
    Date Deposited: 23 Aug 2016 10:59
    Journal or Publication Title: The Plant Journal
    Publisher: Blackwell Publishing Ltd.
    Refereed: Yes
    URI:

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