Perturbed lignification impacts tree growth in hybrid poplar--a function of sink strength, vascular integrity, and photosynthetic assimilation.
Identifieur interne : 003846 ( Main/Exploration ); précédent : 003845; suivant : 003847Perturbed lignification impacts tree growth in hybrid poplar--a function of sink strength, vascular integrity, and photosynthetic assimilation.
Auteurs : Heather D. Coleman [Canada] ; A Lacey Samuels ; Robert D. Guy ; Shawn D. MansfieldSource :
- Plant physiology [ 0032-0889 ] ; 2008.
Descripteurs français
- KwdFr :
- MESH :
- croissance et développement : Populus.
- métabolisme : Lignine, Populus.
- physiologie : Populus.
- Biomasse, Données de séquences moléculaires, Hybridation génétique, Photosynthèse, Xylème.
English descriptors
- KwdEn :
- MESH :
- chemical , metabolism : Lignin.
- growth & development : Populus.
- metabolism : Populus.
- physiology : Populus.
- Biomass, Hybridization, Genetic, Molecular Sequence Data, Photosynthesis, Xylem.
Abstract
The effects of reductions in cell wall lignin content, manifested by RNA interference suppression of coumaroyl 3'-hydroxylase, on plant growth, water transport, gas exchange, and photosynthesis were evaluated in hybrid poplar trees (Populus alba x grandidentata). The growth characteristics of the reduced lignin trees were significantly impaired, resulting in smaller stems and reduced root biomass when compared to wild-type trees, as well as altered leaf morphology and architecture. The severe inhibition of cell wall lignification produced trees with a collapsed xylem phenotype, resulting in compromised vascular integrity, and displayed reduced hydraulic conductivity and a greater susceptibility to wall failure and cavitation. In the reduced lignin trees, photosynthetic carbon assimilation and stomatal conductance were also greatly reduced, however, shoot xylem pressure potential and carbon isotope discrimination were higher and water-use efficiency was lower, inconsistent with water stress. Reductions in assimilation rate could not be ascribed to increased stomatal limitation. Starch and soluble sugars analysis of leaves revealed that photosynthate was accumulating to high levels, suggesting that the trees with substantially reduced cell wall lignin were not carbon limited and that reductions in sink strength were, instead, limiting photosynthesis.
DOI: 10.1104/pp.108.125500
PubMed: 18805953
PubMed Central: PMC2577275
Affiliations:
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Coleman</name><affiliation wicri:level="4"><nlm:affiliation>Department of Wood Science, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z4.</nlm:affiliation><country>Canada</country><wicri:regionArea>Department of Wood Science, University of British Columbia, Vancouver, British Columbia</wicri:regionArea><orgName type="university">Université de la Colombie-Britannique</orgName><placeName><settlement type="city">Vancouver</settlement><region type="state">Colombie-Britannique </region></placeName></affiliation></author><author><name sortKey="Samuels, A Lacey" sort="Samuels, A Lacey" uniqKey="Samuels A" first="A Lacey" last="Samuels">A Lacey Samuels</name></author><author><name sortKey="Guy, Robert D" sort="Guy, Robert D" uniqKey="Guy R" first="Robert D" last="Guy">Robert D. Guy</name></author><author><name sortKey="Mansfield, Shawn D" sort="Mansfield, Shawn D" uniqKey="Mansfield S" first="Shawn D" last="Mansfield">Shawn D. 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The growth characteristics of the reduced lignin trees were significantly impaired, resulting in smaller stems and reduced root biomass when compared to wild-type trees, as well as altered leaf morphology and architecture. The severe inhibition of cell wall lignification produced trees with a collapsed xylem phenotype, resulting in compromised vascular integrity, and displayed reduced hydraulic conductivity and a greater susceptibility to wall failure and cavitation. In the reduced lignin trees, photosynthetic carbon assimilation and stomatal conductance were also greatly reduced, however, shoot xylem pressure potential and carbon isotope discrimination were higher and water-use efficiency was lower, inconsistent with water stress. Reductions in assimilation rate could not be ascribed to increased stomatal limitation. Starch and soluble sugars analysis of leaves revealed that photosynthate was accumulating to high levels, suggesting that the trees with substantially reduced cell wall lignin were not carbon limited and that reductions in sink strength were, instead, limiting photosynthesis.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">18805953</PMID><DateCompleted><Year>2009</Year><Month>01</Month><Day>02</Day></DateCompleted><DateRevised><Year>2019</Year><Month>01</Month><Day>08</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0032-0889</ISSN><JournalIssue CitedMedium="Print"><Volume>148</Volume><Issue>3</Issue><PubDate><Year>2008</Year><Month>Nov</Month></PubDate></JournalIssue><Title>Plant physiology</Title><ISOAbbreviation>Plant Physiol</ISOAbbreviation></Journal><ArticleTitle>Perturbed lignification impacts tree growth in hybrid poplar--a function of sink strength, vascular integrity, and photosynthetic assimilation.</ArticleTitle><Pagination><MedlinePgn>1229-37</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1104/pp.108.125500</ELocationID><Abstract><AbstractText>The effects of reductions in cell wall lignin content, manifested by RNA interference suppression of coumaroyl 3'-hydroxylase, on plant growth, water transport, gas exchange, and photosynthesis were evaluated in hybrid poplar trees (Populus alba x grandidentata). The growth characteristics of the reduced lignin trees were significantly impaired, resulting in smaller stems and reduced root biomass when compared to wild-type trees, as well as altered leaf morphology and architecture. The severe inhibition of cell wall lignification produced trees with a collapsed xylem phenotype, resulting in compromised vascular integrity, and displayed reduced hydraulic conductivity and a greater susceptibility to wall failure and cavitation. In the reduced lignin trees, photosynthetic carbon assimilation and stomatal conductance were also greatly reduced, however, shoot xylem pressure potential and carbon isotope discrimination were higher and water-use efficiency was lower, inconsistent with water stress. Reductions in assimilation rate could not be ascribed to increased stomatal limitation. 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Guy</name><name sortKey="Mansfield, Shawn D" sort="Mansfield, Shawn D" uniqKey="Mansfield S" first="Shawn D" last="Mansfield">Shawn D. Mansfield</name><name sortKey="Samuels, A Lacey" sort="Samuels, A Lacey" uniqKey="Samuels A" first="A Lacey" last="Samuels">A Lacey Samuels</name></noCountry><country name="Canada"><region name="Colombie-Britannique "><name sortKey="Coleman, Heather D" sort="Coleman, Heather D" uniqKey="Coleman H" first="Heather D" last="Coleman">Heather D. Coleman</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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