Abstract
We isolated the 5′ flanking region of a gene for phenylalanine ammonia-lyase (PAL; EC 4.3.1.5) from Pinus taeda, PtaPAL. To investigate the tissue-specific expression of the PtaPAL promoter, histochemical assay of GUS activity was performed using the transgenic tobacco expressing the PtaPAL promoter-GUS. The region of −897 to −420 in PtaPAL promoter showed high activities in the secondary xylem and response to bending stress. To characterize the cis-regulatory functions of the promoters for enzymes in phenylpropanoid biosynthesis, we examined the activity of chimeric promoters of PtaPAL and a 4-coumarate CoA ligase, Pta4CLα. The chimeric promoter showed similar activity as the Pta4CLα promoter. Electrophoretic mobility shift assays implicated −897 to –674 of PtaPAL promoter containing cis-elements of the expression in xylem of Pinus taeda. The results suggested that AC elements of PtaPAL have multiple functions in the expression under the various developmental stages and stress conditions in the transgenic tobacco.
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Acknowledgments
The authors like to thank Dr. A. Kawaoka, Dr. L. Li, and Dr. F. Qin for the critical comments on the manuscript. The project was supported by a grant from the ArborGen, LLC.
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Communicated by H. Ebinuma.
The nucleotide sequence data reported will appear in the EMBL, GenBank, and DDBJ Nucleotide Sequence Databases under the accession number AB449103 (PtaPAL promoter sequence).
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Osakabe, Y., Osakabe, K. & Chiang, V.L. Characterization of the tissue-specific expression of phenylalanine ammonia-lyase gene promoter from loblolly pine (Pinus taeda) in Nicotiana tabacum . Plant Cell Rep 28, 1309–1317 (2009). https://doi.org/10.1007/s00299-009-0707-1
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DOI: https://doi.org/10.1007/s00299-009-0707-1
Keywords
- PtaPAL
- Lignin
- Pinus taeda
- AC element