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. 1987 Aug 25;15(16):6501–6514. doi: 10.1093/nar/15.16.6501

5' proximal sequences of a soybean ribulose-1,5-bisphosphate carboxylase small subunit gene direct light and phytochrome controlled transcription.

B W Shirley, S L Berry-Lowe, S G Rogers, J S Flick, R Horsch, R T Fraley, R B Meagher
PMCID: PMC306119  PMID: 3627996

Abstract

Two closely related ribulose-1,5-bisphosphate carboxylase small subunit (SSU) genes, SRS1 and SRS4, are transcribed at high levels in soybean plants in response to light. Transgenic petunia plants containing 5' sequences from SRS1 or SRS4 fused to the polypeptide encoding region of a neomycin phosphotransferase (NPTII) gene exhibit selectable kanamycin resistance. Deletion of three ATG codons from the region preceding the normal NPTII translation start site has little effect on the levels of kanamycin resistance in transformed plants. Run-on transcription assays in isolated nuclei demonstrate that transcription of the SRS1/NPTII chimera and the native petunia SSU11A gene subfamily is light regulated and under phytochrome control in leaves of transgenic plants. In young expanding leaves of fully light grown plants, transcription of these genes is markedly reduced within minutes of far-red treatment, while ribosomal DNA and actin gene transcription remains unchanged. This is analogous to the transcriptional response we observed for SRS1 and SRS4 in soybean seedlings. These data suggest (1) that transcription of SSU genes in both soybean and petunia require the continued presence or synthesis of phytochrome in the Pfr form and (2) that 5' sequences are sufficient to direct the phytochrome controlled transcriptional response of the SRS1 gene. In fully expanded mature leaves we found the transcription rates of the native SSU11A gene subfamily, the chimeric SRS1/NPTII gene, the rDNA genes, and several other control genes to be reduced markedly after far-red treatment or after extended periods of darkness. The contrast between results in young and mature leaves is discussed.

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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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