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. 1991 Sep;3(9):893–905. doi: 10.1105/tpc.3.9.893

Developmental and UV Light Regulation of the Snapdragon Chalcone Synthase Promoter.

K Fritze 1, D Staiger 1, I Czaja 1, R Walden 1, J Schell 1, D Wing 1
PMCID: PMC160058  PMID: 12324622

Abstract

Expression directed by the 1.1-kb snapdragon chalcone synthase (CHS) promoter linked to the [beta]-glucuronidase reporter gene has been studied in transgenic tobacco. The pattern of expression of the chimeric gene was compared with the expression of the endogenous CHS genes in tobacco and snapdragon. We demonstrate that expression of the CHS promoter is controlled in both an organ-specific and tissue-specific manner. The highest level of expression was observed in immature seeds. Deletions were used to define regions of the promoter required for expression in roots, stems, leaves, seeds, and flower petals of transgenic plants. We have defined the minimal sequences required for expression in different organs and mapped regions of the promoter that influence expression in either a positive or negative manner. A promoter fragment truncated to -39 activates transcription in roots of 4-week-old seedlings, whereas a fragment extending to -197 bp directs expression in petals and seeds. A positive regulatory element located between -661 and -566 and comprising a 47-bp direct repeat is active in all tissues investigated except petals. UV light-regulated expression in leaves of transgenic tobacco seedlings is dependent on the presence of sequences also required for leaf-specific expression. Within the intact promoter, sequences that individually confer different patterns of expression interact to produce the highly regulated expression pattern of CHS.

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Selected References

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