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Sequences upstream and downstream of two xylem-specific pine genes influence their expression
E -G. No1, Y Zhou, C A. Loopstra
1Department of Forest Science and Crop Biotechnology Center, Texas A&M University, 77843-2135, College Station, TX, USA
Plant Science : an International Journal of Experimental Plant Biology
|February 13, 2001
Summary
Identifying regulatory elements in pine xylem is key for wood property engineering. Specific elements influence gene expression in vascular tissues, aiding forest tree genetic improvement.
Area of Science:
- Plant Molecular Biology
- Forest Genetics
- Gene Regulation
Background:
- Understanding gene regulation in forest trees is crucial for improving wood properties through genetic engineering.
- Loblolly pine (Pinus taeda) xylem-specific gene expression is important for tree development and wood quality.
Purpose of the Study:
- To identify and characterize regulatory elements (promoters and terminators) from loblolly pine genes (PtX3H6, PtX14A9) that confer expression in differentiating xylem.
- To investigate the role of these elements in regulating gene expression in transgenic tobacco and hybrid poplar.
Main Methods:
- Constructed gene expression vectors with pine promoters (PtX3H6, PtX14A9) or CaMV 35S promoter, uidA reporter gene, and pine or NOS terminators.
- Transformed the constructs into tobacco and hybrid poplar plants.
- Analyzed beta-glucuronidase (GUS) expression patterns in various tissues.
Main Results:
- Neither pine promoter conferred xylem-specific expression in tobacco with the NOS terminator.
- A 3' element in the PtX3H6 terminator reduced GUS expression, leading to preferential vascular tissue expression in tobacco when paired with the PtX3H6 promoter.
- In poplar leaves, pine promoters with the NOS terminator showed preferential GUS expression in veins.
- The PtX3H6 terminator significantly decreased expression in poplar leaves and stems with the PtX3H6 promoter, but not with the CaMV 35S promoter.
- An element in the PtX14A9 terminator increased GUS expression in poplar veins.
Conclusions:
- Regulatory elements from loblolly pine can influence gene expression specificity in vascular tissues of transgenic plants.
- Specific pine promoter and terminator combinations show potential for directing gene expression in tree improvement efforts.
- Further characterization of these elements is needed to fully exploit their utility in genetic engineering of wood properties.