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Reduced Lignin Content and Altered Lignin Composition in Transgenic Tobacco Down-Regulated in Expression of L-Phenylalanine Ammonia-Lyase or Cinnamate 4-Hydroxylase
Open accessAbstract
We analyzed lignin content and composition in transgenic tobacco (Nicotiana tabacum) lines altered in the expression of the early phenylpropanoid biosynthetic enzymes L-phenylalanine ammonia-lyase and cinnamate 4-hydroxylase (C4H). The reduction of C4H activity by antisense expression or sense suppression resulted in reduced levels of Klason lignin, accompanied by a decreased syringyl/guaiacyl monomer ratio as determined by pyrolysis gas chromatography/mass spectrometry Similar reduction of lignin levels by down -regulation of L-phenylalanine ammonia-lyase, the enzyme preceding C4H in the central phenylpropanoid pathway, did not result in a decreased syringyl/guaiacyl ratio. Rather, analysis of lignin methoxyl content and pyrolysis suggested an increased syringyl/guaiacyl ratio. One possible explanation of these results is that monolignol biosynthesis from L-phenylalanine might occur by more than one route, even at the early stages of the core phenylpropanoid pathway, prior to the formation of specific monolignol precursors.
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Van Soest, P. J., Robertson, J. B., & Lewis, B. A. (1991) · Journal of Dairy Science · doi:10.3168/jds.s0022-0302(91)78551-2 · Cited by 28,658
Cited by
Boerjan, W., Ralph, J., & Baucher, M. (2003) · Annual Review of Plant Biology · doi:10.1146/annurev.arplant.54.031902.134938 · Cited by 4,504
Plant Phenylalanine/Tyrosine Ammonia-lyases
Barros, J., & Dixon, R. A. (2020) · Trends in Plant Science · doi:10.1016/j.tplants.2019.09.011 · Cited by 348
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Metadata
- Authors
- Sewalt, V., Ni, W., Blount, J. W., Jung, H. G., Masoud, S. A., Howles, P. A., Lamb, C., & Dixon, R. A.
- Venue
- Plant Physiology
- Publisher
- Oxford University Press (OUP)
- Published
- 1997-09-01
- Volume
- 115
- Issue
- 1
- Pages
- 41-50
- ISSN
- 0032-0889 (ISSN-L)
- 1532-2548
- OpenAlex
- W1856779218
- Cited by
- 315
- References
- 1
- FWCI
- 13.11
- Type
- journal article
- Language
- en
- Open access
- bronze
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- CoChat. (2026). Citation check: Reduced Lignin Content and Altered Lignin Composition in Transgenic Tobacco Down-Regulated in Expression of L-Phenylalanine Ammonia-Lyase or Cinnamate 4-Hydroxylase. https://app.cochat.ai/papers/10.1104/pp.115.1.41
- The paper
- Sewalt, V., Ni, W., Blount, J. W., Jung, H. G., Masoud, S. A., Howles, P. A., Lamb, C., & Dixon, R. A. (1997). Reduced Lignin Content and Altered Lignin Composition in Transgenic Tobacco Down-Regulated in Expression of L-Phenylalanine Ammonia-Lyase or Cinnamate 4-Hydroxylase. Plant Physiology. https://doi.org/10.1104/pp.115.1.41
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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