Abstract
Constitutive promoters are the most common promoters used to drive the expression of various genes in monocots and dicots. Therefore, it is of intense interest to ascertain their expression patterns in various plant species, organs and during their ontogenic development. In this study, the activity of the CaMV 35S promoter in transgenic tobacco plants was assessed. In contrast to other studies, performed rather on the primary transformants (T0 generation), here, individuals of T1 and T2 generations were used. The expression profiles of the CaMV 35S promoter were tracked within various plant organs and tissues using the GFP marker. Special attention was given to floral tissues for which the original data regarding the CaMV 35S expression were obtained. As expected, distinct developmental and organ/tissue specific expression patterns in a plant body were observed. CaMV 35S activity was detected in most of the plant tissues and during different developmental stages. The GFP signal was not visible in dry seeds only, but it became clearly apparent within 24–48 h after sowing onto the medium, what, among other things, enables the discrimination of transgenic and non-transgenic seeds/seedlings. Afterwards, the most pronounced GFP fluorescence intensity was usually visible in various vascular tissues of both, T1 and T2 plants, indicating the high promoter activity. A stable manifestation of the promoter was retained in the next T2 generation without any evident changes or losses of activity, showing the expression stability of the CaMV 35S.
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Abbreviations
- CaMV 35S:
-
Cauliflower mosaic virus promoter
- GFP:
-
Green fluorescent protein
- GUS:
-
β-Glucuronidase
- Kn:
-
kanamycin
- RFP:
-
Red fluorescent protein
- RT-PCR:
-
Reverse transcription polymerase chain reaction
- T-DNA:
-
Transferred DNA
- YFP:
-
Yellow fluorescent protein
- gfp :
-
Green fluorescent protein gene
- mgfp5-ER :
-
Modified gene for Green fluorescent protein
- nptII :
-
Neomycin Phosphotransferase II gene
- nos (promoter):
-
Nopaline Synthase promoter
- uidA :
-
β-Glucuronidase gene
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Acknowledgements
The authors are grateful to Stanislav Vitha (Microscopy and Imaging Center Texas A&M University) for his valuable critical comments and revisions. The authors would like also gratefully acknowledge the financial support received from Ministry of Education, Youth and Sport of the Czech Republic (grants 1M06030, 1PO5ME800 and MSM 60076658-06). Marek Hraška received the support from grant GA ČR 31/H160 provided by the Grant Agency of the Czech Republic. Linguistic revision was kindly performed by John McAvoy.
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Hraška, M., Rakouský, S. & Čurn, V. Tracking of the CaMV-35S promoter performance in GFP transgenic tobacco, with a special emphasis on flowers and reproductive organs, confirmed its predominant activity in vascular tissues. Plant Cell Tiss Organ Cult 94, 239–251 (2008). https://doi.org/10.1007/s11240-007-9312-6
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DOI: https://doi.org/10.1007/s11240-007-9312-6