Abstract
To be effective in crop biotechnology applications, gene promoters need to be stably active over sequential generations in a population of single-copy transgenic lines. Most of the stress-inducible promoters characterized in plants thus far have been analyzed at early (T0, T1 or T2) generations and/or by testing only a small number of transgenic lines. In our current study, we report our analysis of OsNCED3, a stress-inducible rice promoter involved in ABA biosynthesis, in various organs and tissues of transgenic rice plants over the T2–4 homozygous generations. The transgene copy numbers in the lines harboring the OsNCED3:gfp construct were determined and six single- and two double-copy transgenic lines were analyzed for promoter activity in comparison with the Wsi18, a stress-inducible promoter previously characterized. The exogenous promoter activities were found to be significantly enhanced in the roots and leaves, whereas zero or low levels of activity were evident in grains and flowers, under drought and high-salinity conditions. The highest induction levels of gfp transcripts in the OsNCED3:gfp plants upon drought treatments were 161- and 93-fold in leaves and roots, respectively, and these levels were comparable with those of gfp transcripts in the Wsi18:gfp plants. A comparison of the promoter activities between the T2–T4 plants revealed that comparable activity levels were maintained over these three homozygous generations with no evidence of silencing. Thus, our results provide the OsNCED3 promoter that is stress-inducible in a whole rice plant except for in the aleurones and endosperm and stably active over three generations.
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Abbreviations
- NCED :
-
9-cis-Epoxycarotenoid dioxygenase
- Wsi18 :
-
Water stress-inducible protein 18
- NT:
-
Non-transgenic
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Acknowledgments
This study was supported by the Rural Development Administration under the “Cooperative Research Program for Agriculture Science & Technology Development” (Project No. PJ906910), the Next-Generation BioGreen 21 Program (Project No. PJ007971 to J.-K.K., PJ008184 to S.-H.H. and PJ009022 to J.S.J.), and by the Ministry of Education, Science and Technology under the “Mid-career Researcher Program” (Project No. 20100026168 to J.-K.K.).
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S. W. Bang, S.-H. Park and J. S. Jeong contributed equally to this work.
An erratum to this article is available at http://dx.doi.org/10.1007/s00425-014-2112-4.
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Bang, S.W., Park, SH., Jeong, J.S. et al. Characterization of the stress-inducible OsNCED3 promoter in different transgenic rice organs and over three homozygous generations. Planta 237, 211–224 (2013). https://doi.org/10.1007/s00425-012-1764-1
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DOI: https://doi.org/10.1007/s00425-012-1764-1