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2007 | 29 | 3 |
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Monitoring the expression of green fluorescent protein in carrot

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Green fluorescent protein (GFP) was successfully used as a visual reporter at various stages of carrot (Daucus carota L.) transformation. GFP-fluorescence was non-invasively observed in protoplasts, callus and plants after the delivery of mgfp5-er gene using two transformation methods: direct DNA transfer into polyethylene glycol (PEG) -treated protoplasts and inoculation of root discs with Agrobacterium rhizogenes. Transient GFP-expression was detected in the treated protoplasts and monitored during the first week of the cell culture until the stable level of expression was observed. It was useful for the comparison of protoplast susceptibility to DNA uptake and the transgene expression as the fluorescence declined with various rates depending on the used carrot genotype and PEG-concentration. GFP-monitoring in callus enabled the selection of stably expressing lines. It also allowed verification of the homogeneous tissue composition with regard to the expression of the transgene. In plants, GFP-performance depended on the assayed tissue and organ despite of the constitutive 35S promoter. The expression was visually detected in both vegetative and generative parts, but particularly strong fluorescence was observed in leaf marginal meristems, petioles, stems, and styles. Those tissues can be convenient for examination of the transgenic plants during their growth. The results encourage that GFP is a valuable reporter and can be routinely used for optimization of transformation protocol, selection of transformants and monitoring transgenic carrot.
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  • Department of Genetics, Plant Breeding and Seed Science, Agricultural University of Krakow, Al. 29 Listopada 54, 31-425 Krakow, Poland
  • Institute of Horticultural Crops, Federal Centre for Breeding Research on Cultivated Plants, Neuer Weg 22/23, 06484 Quedlinburg, Germany
  • Institute of Horticultural Crops, Federal Centre for Breeding Research on Cultivated Plants, Neuer Weg 22/23, 06484 Quedlinburg, Germany
  • Institute of Horticultural Crops, Federal Centre for Breeding Research on Cultivated Plants, Neuer Weg 22/23, 06484 Quedlinburg, Germany
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