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. 1989 Feb;1(2):209–215. doi: 10.1105/tpc.1.2.209

Sequences 5' to translation start regulate expression of petunia rbcS genes.

C Dean 1, M Favreau 1, J Bedbrook 1, P Dunsmuir 1
PMCID: PMC159753  PMID: 2535543

Abstract

The promoter sequences that contribute to quantitative differences in expression of the petunia genes (rbcS) encoding the small subunit of ribulose bisphosphate carboxylase have been characterized. The promoter regions of the two most abundantly expressed petunia rbcS genes, SSU301 and SSU611, show sequence similarity not present in other rbcS genes. We investigated the significance of these and other sequences by adding specific regions from the SSU301 promoter (the most strongly expressed gene) to equivalent regions in the SSU911 promoter (the least strongly expressed gene) and assaying the expression of the fusions in transgenic tobacco plants. In this way, we characterized an SSU301 promoter region (either from -285 to -178 or -291 to -204) which, when added to SSU911, in either orientation, increased SSU911 expression 25-fold. This increase was equivalent to that caused by addition of the entire SSU301 5'-flanking region. Replacement of SSU911 promoter sequences between -198 and the start codon with sequences from the equivalent region of SSU301 did not increase SSU911 expression significantly. The -291 to -204 SSU301 promoter fragment contributes significantly to quantitative differences in expression between the petunia rbcS genes.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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