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Promoters from kin1 and cor6.6, two homologous Arabidopsis thaliana genes: transcriptional regulation and gene expression induced by low temperature, ABA, osmoticum and dehydration

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Abstract

The Arabidopsis thaliana genes kin1 and cor6.6 belong to the same family and were expressed at higher levels following low temperature and ABA treatments. In an attempt to elucidate the mechanism of gene regulation by low temperature, the relationship between low-temperature- and abscisic acid (ABA)-induced gene expression and possible differential expression of the two genes, we have cloned a 5.3 kb genomic fragment harboring kin1 and cor6.6 and their respective 5′ sequences. The putative promoters of both genes were fused to the β-glucuronidase (GUS) coding sequence and GUS expression was analysed in transgenic tobacco and Arabidopsis plants. The cor6.6 promoter produced a higher basal level of expression than the kin1 promoter in transgenic tobacco. Enzyme assays of inducible GUS activity in transgenic Arabidopsis and tobacco plants showed that GUS activity directed by both kin1 and cor6.6 promoters was significantly induced by ABA, dehydration and osmoticum, but not by low temperature. Northern analysis revealed, in contrast, that GUS mRNA was significantly induced in these transgenic plants by low temperature. Further analysis showed that, at low temperature, GUS protein synthesis from the induced GUS mRNA was inhibited. Together these results reveal induction of kin1 and cor6.6 transcription by low temperature, exogenous ABA and dehydration. However, low-temperature expression is dramatically reduced at the translational level.

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Authors and Affiliations

  1. Plant Biotechnology Institute, National Research Council of Canada, 110 Gymnasium Place, S7N 0W9, Saskatoon, Canada

    Hong Wang, Raju Datla, Fawzy Georges, Mary Loewen & Adrian J. Cutler

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  1. Hong Wang
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  2. Raju Datla
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  3. Fawzy Georges
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  4. Mary Loewen
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  5. Adrian J. Cutler
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Wang, H., Datla, R., Georges, F. et al. Promoters from kin1 and cor6.6, two homologous Arabidopsis thaliana genes: transcriptional regulation and gene expression induced by low temperature, ABA, osmoticum and dehydration. Plant Mol Biol 28, 605–617 (1995). https://doi.org/10.1007/BF00021187

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  • DOI: https://doi.org/10.1007/BF00021187

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