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Activity of a chimeric promoter with the doubled CaMV 35S enhancer element in protoplast-derived cells and transgenic plants in maize

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Abstract

A reproducible and efficient transformation system has been developed for maize that is based on direct DNA uptake into embryogenic protoplasts and regeneration of fertile plants from protoplast-derived transgenic callus tissues. Plasmid DNA, containing the β-glucuronidase (GUS) gene, under the control of the doubled enhancer element (the −208 to −46 bp upstream fragment) from CaMV 35S promoter, linked to the truncated (up to −389 bp from ATG) promoter of wheat, α-amylase gene was introduced into protoplasts from suspension culture of HE/89 genotype. The constructed transformation vectors carried either the neomycin phosphotransferase (NPTII) or phosphinothricin acetyltransferase (PAT) gene as selective marker. The applied DNA uptake protocol has resulted at least in 10–20 resistant calli, or GUS-expressing colonies after treatment of 106 protoplasts. Vital GUS staining of microcalli has made possible the shoot regeneration from the GUS-stained tissues. 80–90% of kanamycin or PPT resistant calli showed GUS activity, and transgenic plants were regenerated from more than 140 clones. Both Southern hybridization and PCR analysis showed the presence of introduced foreign genes in the genomic DNA of the transformants. The chimeric promoter, composed of a tissue specific monocot promoter, and the viral enhancer element specified similar expression pattern in maize plants, as it was determined by the full CaMV 35S promoter in dicot and other monocot plants. The highest GUS specific activity was found in older leaves with progressively less activity in young leaves, stem and root. Histochemical localization of GUS revealed promoter function in leaf epidermis, mesophyll and vascular bundles, in the cortex and vascular cylinder of the root. In roots, the meristematic tip region and vascular tissues stained intensively. Selected transformants were grown up to maturity, and second-generation seedlings with segregation for GUS activity were obtained after outcrossing. The GUS-expressing segregants carried also the NPTII gene as shown by Southern hybridization.

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Author notes

  1. Serik Omirulleh & Murat K. Karabev

    Present address: Institute of Molecular Biology and Biochemistry, Michurina str. 86, 480012, Alma-Ata, Republic of Kazakhstan

  2. Sándor Mórocz

    Present address: Cereal Research Institute, P.O. Box 391, H-6701, Szeged, Hungary

Authors and Affiliations

  1. Institute of Plant Physiology, Biological Research Center, Hungarian Academy of Sciences, P.O. Box 521, H-6701, Szeged, Hungary

    Serik Omirulleh, Mariann Ábrahám, Maxim Golovkin, Iván Stefanov, Murat K. Karabev, László Mustárdy, Sándor Mórocz & Dénes Dudits

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  1. Serik Omirulleh
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  2. Mariann Ábrahám
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  3. Maxim Golovkin
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  4. Iván Stefanov
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  5. Murat K. Karabev
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  7. Sándor Mórocz
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  8. Dénes Dudits
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Omirulleh, S., Ábrahám, M., Golovkin, M. et al. Activity of a chimeric promoter with the doubled CaMV 35S enhancer element in protoplast-derived cells and transgenic plants in maize. Plant Mol Biol 21, 415–428 (1993). https://doi.org/10.1007/BF00028800

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  • DOI: https://doi.org/10.1007/BF00028800

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