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| Content Provider | PubMed Central |
|---|---|
| Author | Lapierre, Catherine Pollet, Brigitte Michel, Petit-conil Toval, Gabriel Romero, Javier Pilate, Gilles Jean-charles, Leplé Wout, Boerjan Ferret, Valérie De Nadai, Véronique Jouanin, Lise |
| Copyright Year | 1999 |
| Abstract | We evaluated lignin profiles and pulping performances of 2-year-old transgenic poplar (Populus tremula × Populus alba) lines severely altered in the expression of caffeic acid/5-hydroxyferulic acid O-methyltransferase (COMT) or cinnamyl alcohol dehydrogenase (CAD). Transgenic poplars with CAD or COMT antisense constructs showed growth similar to control trees. CAD down-regulated poplars displayed a red coloration mainly in the outer xylem. A 90% lower COMT activity did not change lignin content but dramatically increased the frequency of guaiacyl units and resistant biphenyl linkages in lignin. This alteration severely lowered the efficiency of kraft pulping. The Klason lignin level of CAD-transformed poplars was slightly lower than that of the control. Whereas CAD down-regulation did not change the frequency of labile ether bonds or guaiacyl units in lignin, it increased the proportion of syringaldehyde and diarylpropane structures and, more importantly with regard to kraft pulping, of free phenolic groups in lignin. In the most depressed line, ASCAD21, a substantially higher content in free phenolic units facilitated lignin solubilization and fragmentation during kraft pulping. These results point the way to genetic modification of lignin structure to improve wood quality for the pulp industry. |
| Starting Page | 153 |
| File Format | |
| ISSN | 15322548 |
| e-ISSN | 15322548 |
| Journal | Plant Physiology |
| Issue Number | 1 |
| Volume Number | 119 |
| Language | English |
| Publisher | American Society of Plant Physiologists |
| Publisher Date | 1999-01-01 |
| Access Restriction | Open |
| Rights Holder | American Society of Plant Physiologists |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Genetics Physiology Plant Science |
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