PoplarV1, Main, Exploration, bibRecord, 003372

Antisense down-regulation of 4CL expression alters lignification, tree growth, and saccharification potential of field-grown poplar.

Identifieur interne : 003372 ( Main/Exploration ); précédent : 003371; suivant : 003373

Antisense down-regulation of 4CL expression alters lignification, tree growth, and saccharification potential of field-grown poplar.

Auteurs : Steven L. Voelker [États-Unis] ; Barbara Lachenbruch ; Frederick C. Meinzer ; Michael Jourdes ; Chanyoung Ki ; Ann M. Patten ; Laurence B. Davin ; Norman G. Lewis ; Gerald A. Tuskan ; Lee Gunter ; Stephen R. Decker ; Michael J. Selig ; Robert Sykes ; Michael E. Himmel ; Peter Kitin ; Olga Shevchenko ; Steven H. Strauss

Source :

Plant physiology [ 1532-2548 ] ; 2010.

RBID : pubmed:20729393

Descripteurs français

KwdFr :
- ARN antisens (génétique), Arbres (croissance et développement), Biomasse (MeSH), Bois (composition chimique), Coenzyme A ligases (génétique), Coenzyme A ligases (métabolisme), Données de séquences moléculaires (MeSH), Lignine (composition chimique), Phénols (analyse), Populus (croissance et développement), Populus (enzymologie), Populus (génétique), Régulation de l'expression des gènes végétaux (MeSH), Végétaux génétiquement modifiés (croissance et développement), Végétaux génétiquement modifiés (enzymologie), Végétaux génétiquement modifiés (génétique).
MESH :
- analyse : Phénols.
- composition chimique : Bois, Lignine.
- croissance et développement : Arbres, Populus, Végétaux génétiquement modifiés.
- enzymologie : Populus, Végétaux génétiquement modifiés.
- génétique : ARN antisens, Coenzyme A ligases, Populus, Végétaux génétiquement modifiés.
- métabolisme : Coenzyme A ligases.
- Biomasse, Données de séquences moléculaires, Régulation de l'expression des gènes végétaux.

English descriptors

KwdEn :
- Biomass (MeSH), Coenzyme A Ligases (genetics), Coenzyme A Ligases (metabolism), Gene Expression Regulation, Plant (MeSH), Lignin (chemistry), Molecular Sequence Data (MeSH), Phenols (analysis), Plants, Genetically Modified (enzymology), Plants, Genetically Modified (genetics), Plants, Genetically Modified (growth & development), Populus (enzymology), Populus (genetics), Populus (growth & development), RNA, Antisense (genetics), Trees (growth & development), Wood (chemistry).
MESH :
- chemical , analysis : Phenols.
- chemical , chemistry : Lignin.
- chemical , genetics : Coenzyme A Ligases, RNA, Antisense.
- chemical , metabolism : Coenzyme A Ligases.
- chemistry : Wood.
- enzymology : Plants, Genetically Modified, Populus.
- genetics : Plants, Genetically Modified, Populus.
- growth & development : Plants, Genetically Modified, Populus, Trees.
- Biomass, Gene Expression Regulation, Plant, Molecular Sequence Data.

Abstract

Transgenic down-regulation of the Pt4CL1 gene family encoding 4-coumarate:coenzyme A ligase (4CL) has been reported as a means for reducing lignin content in cell walls and increasing overall growth rates, thereby improving feedstock quality for paper and bioethanol production. Using hybrid poplar (Populus tremula × Populus alba), we applied this strategy and examined field-grown transformants for both effects on wood biochemistry and tree productivity. The reductions in lignin contents obtained correlated well with 4CL RNA expression, with a sharp decrease in lignin amount being observed for RNA expression below approximately 50% of the nontransgenic control. Relatively small lignin reductions of approximately 10% were associated with reduced productivity, decreased wood syringyl/guaiacyl lignin monomer ratios, and a small increase in the level of incorporation of H-monomers (p-hydroxyphenyl) into cell walls. Transgenic events with less than approximately 50% 4CL RNA expression were characterized by patches of reddish-brown discolored wood that had approximately twice the extractive content of controls (largely complex polyphenolics). There was no evidence that substantially reduced lignin contents increased growth rates or saccharification potential. Our results suggest that the capacity for lignin reduction is limited; below a threshold, large changes in wood chemistry and plant metabolism were observed that adversely affected productivity and potential ethanol yield. They also underline the importance of field studies to obtain physiologically meaningful results and to support technology development with transgenic trees.

DOI: 10.1104/pp.110.159269
PubMed: 20729393
PubMed Central: PMC2949011

Affiliations:

États-Unis

Links toward previous steps (curation, corpus...)

to stream Main, to step Corpus: 003092
to stream Main, to step Curation: 003092

Le document en format XML

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<term>Coenzyme A Ligases (genetics)</term>
<term>Coenzyme A Ligases (metabolism)</term>
<term>Gene Expression Regulation, Plant (MeSH)</term>
<term>Lignin (chemistry)</term>
<term>Molecular Sequence Data (MeSH)</term>
<term>Phenols (analysis)</term>
<term>Plants, Genetically Modified (enzymology)</term>
<term>Plants, Genetically Modified (genetics)</term>
<term>Plants, Genetically Modified (growth & development)</term>
<term>Populus (enzymology)</term>
<term>Populus (genetics)</term>
<term>Populus (growth & development)</term>
<term>RNA, Antisense (genetics)</term>
<term>Trees (growth & development)</term>
<term>Wood (chemistry)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr"><term>ARN antisens (génétique)</term>
<term>Arbres (croissance et développement)</term>
<term>Biomasse (MeSH)</term>
<term>Bois (composition chimique)</term>
<term>Coenzyme A ligases (génétique)</term>
<term>Coenzyme A ligases (métabolisme)</term>
<term>Données de séquences moléculaires (MeSH)</term>
<term>Lignine (composition chimique)</term>
<term>Phénols (analyse)</term>
<term>Populus (croissance et développement)</term>
<term>Populus (enzymologie)</term>
<term>Populus (génétique)</term>
<term>Régulation de l'expression des gènes végétaux (MeSH)</term>
<term>Végétaux génétiquement modifiés (croissance et développement)</term>
<term>Végétaux génétiquement modifiés (enzymologie)</term>
<term>Végétaux génétiquement modifiés (génétique)</term>
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<keywords scheme="MESH" type="chemical" qualifier="analysis" xml:lang="en"><term>Phenols</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Lignin</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="genetics" xml:lang="en"><term>Coenzyme A Ligases</term>
<term>RNA, Antisense</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Coenzyme A Ligases</term>
</keywords>
<keywords scheme="MESH" qualifier="analyse" xml:lang="fr"><term>Phénols</term>
</keywords>
<keywords scheme="MESH" qualifier="chemistry" xml:lang="en"><term>Wood</term>
</keywords>
<keywords scheme="MESH" qualifier="composition chimique" xml:lang="fr"><term>Bois</term>
<term>Lignine</term>
</keywords>
<keywords scheme="MESH" qualifier="croissance et développement" xml:lang="fr"><term>Arbres</term>
<term>Populus</term>
<term>Végétaux génétiquement modifiés</term>
</keywords>
<keywords scheme="MESH" qualifier="enzymologie" xml:lang="fr"><term>Populus</term>
<term>Végétaux génétiquement modifiés</term>
</keywords>
<keywords scheme="MESH" qualifier="enzymology" xml:lang="en"><term>Plants, Genetically Modified</term>
<term>Populus</term>
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<keywords scheme="MESH" qualifier="genetics" xml:lang="en"><term>Plants, Genetically Modified</term>
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<keywords scheme="MESH" qualifier="growth & development" xml:lang="en"><term>Plants, Genetically Modified</term>
<term>Populus</term>
<term>Trees</term>
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<keywords scheme="MESH" qualifier="génétique" xml:lang="fr"><term>ARN antisens</term>
<term>Coenzyme A ligases</term>
<term>Populus</term>
<term>Végétaux génétiquement modifiés</term>
</keywords>
<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Coenzyme A ligases</term>
</keywords>
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<term>Gene Expression Regulation, Plant</term>
<term>Molecular Sequence Data</term>
</keywords>
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<term>Données de séquences moléculaires</term>
<term>Régulation de l'expression des gènes végétaux</term>
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<front><div type="abstract" xml:lang="en">Transgenic down-regulation of the Pt4CL1 gene family encoding 4-coumarate:coenzyme A ligase (4CL) has been reported as a means for reducing lignin content in cell walls and increasing overall growth rates, thereby improving feedstock quality for paper and bioethanol production. Using hybrid poplar (Populus tremula × Populus alba), we applied this strategy and examined field-grown transformants for both effects on wood biochemistry and tree productivity. The reductions in lignin contents obtained correlated well with 4CL RNA expression, with a sharp decrease in lignin amount being observed for RNA expression below approximately 50% of the nontransgenic control. Relatively small lignin reductions of approximately 10% were associated with reduced productivity, decreased wood syringyl/guaiacyl lignin monomer ratios, and a small increase in the level of incorporation of H-monomers (p-hydroxyphenyl) into cell walls. Transgenic events with less than approximately 50% 4CL RNA expression were characterized by patches of reddish-brown discolored wood that had approximately twice the extractive content of controls (largely complex polyphenolics). There was no evidence that substantially reduced lignin contents increased growth rates or saccharification potential. Our results suggest that the capacity for lignin reduction is limited; below a threshold, large changes in wood chemistry and plant metabolism were observed that adversely affected productivity and potential ethanol yield. They also underline the importance of field studies to obtain physiologically meaningful results and to support technology development with transgenic trees.</div>
</front>
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<ArticleTitle>Antisense down-regulation of 4CL expression alters lignification, tree growth, and saccharification potential of field-grown poplar.</ArticleTitle>
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<Abstract><AbstractText>Transgenic down-regulation of the Pt4CL1 gene family encoding 4-coumarate:coenzyme A ligase (4CL) has been reported as a means for reducing lignin content in cell walls and increasing overall growth rates, thereby improving feedstock quality for paper and bioethanol production. Using hybrid poplar (Populus tremula × Populus alba), we applied this strategy and examined field-grown transformants for both effects on wood biochemistry and tree productivity. The reductions in lignin contents obtained correlated well with 4CL RNA expression, with a sharp decrease in lignin amount being observed for RNA expression below approximately 50% of the nontransgenic control. Relatively small lignin reductions of approximately 10% were associated with reduced productivity, decreased wood syringyl/guaiacyl lignin monomer ratios, and a small increase in the level of incorporation of H-monomers (p-hydroxyphenyl) into cell walls. Transgenic events with less than approximately 50% 4CL RNA expression were characterized by patches of reddish-brown discolored wood that had approximately twice the extractive content of controls (largely complex polyphenolics). There was no evidence that substantially reduced lignin contents increased growth rates or saccharification potential. Our results suggest that the capacity for lignin reduction is limited; below a threshold, large changes in wood chemistry and plant metabolism were observed that adversely affected productivity and potential ethanol yield. They also underline the importance of field studies to obtain physiologically meaningful results and to support technology development with transgenic trees.</AbstractText>
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<Chemical><RegistryNumber>9005-53-2</RegistryNumber>
<NameOfSubstance UI="D008031">Lignin</NameOfSubstance>
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<MeshHeading><DescriptorName UI="D018506" MajorTopicYN="N">Gene Expression Regulation, Plant</DescriptorName>
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<MeshHeading><DescriptorName UI="D008031" MajorTopicYN="N">Lignin</DescriptorName>
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Antisense down-regulation of 4CL expression alters lignification, tree growth, and saccharification potential of field-grown poplar.

Antisense down-regulation of 4CL expression alters lignification, tree growth, and saccharification potential of field-grown poplar.

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