Nitrogen-driven stem elongation in poplar is linked with wood modification and gene clusters for stress, photosynthesis and cell wall formation.
Identifieur interne : 002122 ( Main/Exploration ); précédent : 002121; suivant : 002123Nitrogen-driven stem elongation in poplar is linked with wood modification and gene clusters for stress, photosynthesis and cell wall formation.
Auteurs : Dejuan Euring ; Hua Bai ; Dennis Janz ; Andrea PolleSource :
- BMC plant biology [ 1471-2229 ] ; 2014.
Descripteurs français
- KwdFr :
- Azote (métabolisme), Engrais (analyse), Famille multigénique (MeSH), Lignine (métabolisme), Paroi cellulaire (effets des médicaments et des substances chimiques), Paroi cellulaire (métabolisme), Photosynthèse (effets des médicaments et des substances chimiques), Phénols (métabolisme), Populus (croissance et développement), Populus (génétique), Populus (métabolisme), Régulation de l'expression des gènes végétaux (MeSH), Réseaux de régulation génique (MeSH), Stress physiologique (effets des médicaments et des substances chimiques), Transcriptome (MeSH).
- MESH :
- analyse : Engrais.
- croissance et développement : Populus.
- effets des médicaments et des substances chimiques : Paroi cellulaire, Photosynthèse, Stress physiologique.
- génétique : Populus.
- métabolisme : Azote, Lignine, Paroi cellulaire, Phénols, Populus.
- Famille multigénique, Régulation de l'expression des gènes végétaux, Réseaux de régulation génique, Transcriptome.
English descriptors
- KwdEn :
- Cell Wall (drug effects), Cell Wall (metabolism), Fertilizers (analysis), Gene Expression Regulation, Plant (MeSH), Gene Regulatory Networks (MeSH), Lignin (metabolism), Multigene Family (MeSH), Nitrogen (metabolism), Phenols (metabolism), Photosynthesis (drug effects), Populus (genetics), Populus (growth & development), Populus (metabolism), Stress, Physiological (drug effects), Transcriptome (MeSH).
- MESH :
- chemical , analysis : Fertilizers.
- drug effects : Cell Wall, Photosynthesis, Stress, Physiological.
- genetics : Populus.
- growth & development : Populus.
- metabolism : Cell Wall, Lignin, Nitrogen, Phenols, Populus.
- Gene Expression Regulation, Plant, Gene Regulatory Networks, Multigene Family, Transcriptome.
Abstract
BACKGROUND
Nitrogen is an important nutrient, often limiting plant productivity and yield. In poplars, woody crops used as feedstock for renewable resources and bioenergy, nitrogen fertilization accelerates growth of the young, expanding stem internodes. The underlying molecular mechanisms of nitrogen use for extension growth in poplars are not well understood. The aim of this study was to dissect the nitrogen-responsive transcriptional network in the elongation zone of Populus trichocarpa in relation to extension growth and cell wall properties.
RESULTS
Transcriptome analyses in the first two internodes of P. trichocarpa stems grown without or with nitrogen fertilization (5 mM NH4NO3) revealed 1037 more than 2-fold differentially expressed genes (DEGs). Co-expression analysis extracted a network containing about one-third of the DEGs with three main complexes of strongly clustered genes. These complexes represented three main processes that were responsive to N-driven growth: Complex 1 integrated growth processes and stress suggesting that genes with established functions in abiotic and biotic stress are also recruited to coordinate growth. Complex 2 was enriched in genes with decreased transcript abundance and functionally annotated as photosynthetic hub. Complex 3 was a hub for secondary cell wall formation connecting well-known transcription factors that control secondary cell walls with genes for the formation of cellulose, hemicelluloses, and lignin. Anatomical and biochemical analysis supported that N-driven growth resulted in early secondary cell wall formation in the elongation zone with thicker cell walls and increased lignin. These alterations contrasted the N influence on the secondary xylem, where thinner cell walls with lower lignin contents than in unfertilized trees were formed.
CONCLUSION
This study uncovered that nitrogen-responsive elongation growth of poplar internodes is linked with abiotic stress, suppression of photosynthetic genes and stimulation of genes for cell wall formation. Anatomical and biochemical analysis supported increased accumulation of cell walls and secondary metabolites in the elongation zone. The finding of a nitrogen-responsive cell wall hub may have wider implications for the improvement of tree nitrogen use efficiency and opens new perspectives on the enhancement of wood composition as a feedstock for biofuels.
DOI: 10.1186/s12870-014-0391-3
PubMed: 25547614
PubMed Central: PMC4302602
Affiliations:
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uniqKey="Polle A" first="Andrea" last="Polle">Andrea Polle</name></author></analytic><series><title level="j">BMC plant biology</title><idno type="eISSN">1471-2229</idno><imprint><date when="2014" type="published">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cell Wall (drug effects)</term><term>Cell Wall (metabolism)</term><term>Fertilizers (analysis)</term><term>Gene Expression Regulation, Plant (MeSH)</term><term>Gene Regulatory Networks (MeSH)</term><term>Lignin (metabolism)</term><term>Multigene Family (MeSH)</term><term>Nitrogen (metabolism)</term><term>Phenols (metabolism)</term><term>Photosynthesis (drug effects)</term><term>Populus (genetics)</term><term>Populus (growth & development)</term><term>Populus (metabolism)</term><term>Stress, Physiological (drug effects)</term><term>Transcriptome (MeSH)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Azote (métabolisme)</term><term>Engrais (analyse)</term><term>Famille multigénique (MeSH)</term><term>Lignine (métabolisme)</term><term>Paroi cellulaire (effets des médicaments et des substances chimiques)</term><term>Paroi cellulaire (métabolisme)</term><term>Photosynthèse (effets des médicaments et des substances chimiques)</term><term>Phénols (métabolisme)</term><term>Populus (croissance et développement)</term><term>Populus (génétique)</term><term>Populus (métabolisme)</term><term>Régulation de l'expression des gènes végétaux (MeSH)</term><term>Réseaux de régulation génique (MeSH)</term><term>Stress physiologique (effets des médicaments et des substances chimiques)</term><term>Transcriptome (MeSH)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="analysis" xml:lang="en"><term>Fertilizers</term></keywords><keywords scheme="MESH" qualifier="analyse" xml:lang="fr"><term>Engrais</term></keywords><keywords scheme="MESH" qualifier="croissance et développement" xml:lang="fr"><term>Populus</term></keywords><keywords scheme="MESH" qualifier="drug effects" xml:lang="en"><term>Cell Wall</term><term>Photosynthesis</term><term>Stress, Physiological</term></keywords><keywords scheme="MESH" qualifier="effets des médicaments et des substances chimiques" xml:lang="fr"><term>Paroi cellulaire</term><term>Photosynthèse</term><term>Stress physiologique</term></keywords><keywords scheme="MESH" qualifier="genetics" xml:lang="en"><term>Populus</term></keywords><keywords scheme="MESH" qualifier="growth & development" xml:lang="en"><term>Populus</term></keywords><keywords scheme="MESH" qualifier="génétique" xml:lang="fr"><term>Populus</term></keywords><keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Cell Wall</term><term>Lignin</term><term>Nitrogen</term><term>Phenols</term><term>Populus</term></keywords><keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Azote</term><term>Lignine</term><term>Paroi cellulaire</term><term>Phénols</term><term>Populus</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Gene Expression Regulation, Plant</term><term>Gene Regulatory Networks</term><term>Multigene Family</term><term>Transcriptome</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Famille multigénique</term><term>Régulation de l'expression des gènes végétaux</term><term>Réseaux de régulation génique</term><term>Transcriptome</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p><b>BACKGROUND</b></p><p>Nitrogen is an important nutrient, often limiting plant productivity and yield. In poplars, woody crops used as feedstock for renewable resources and bioenergy, nitrogen fertilization accelerates growth of the young, expanding stem internodes. The underlying molecular mechanisms of nitrogen use for extension growth in poplars are not well understood. The aim of this study was to dissect the nitrogen-responsive transcriptional network in the elongation zone of Populus trichocarpa in relation to extension growth and cell wall properties.</p></div><div type="abstract" xml:lang="en"><p><b>RESULTS</b></p><p>Transcriptome analyses in the first two internodes of P. trichocarpa stems grown without or with nitrogen fertilization (5 mM NH4NO3) revealed 1037 more than 2-fold differentially expressed genes (DEGs). Co-expression analysis extracted a network containing about one-third of the DEGs with three main complexes of strongly clustered genes. These complexes represented three main processes that were responsive to N-driven growth: Complex 1 integrated growth processes and stress suggesting that genes with established functions in abiotic and biotic stress are also recruited to coordinate growth. Complex 2 was enriched in genes with decreased transcript abundance and functionally annotated as photosynthetic hub. Complex 3 was a hub for secondary cell wall formation connecting well-known transcription factors that control secondary cell walls with genes for the formation of cellulose, hemicelluloses, and lignin. Anatomical and biochemical analysis supported that N-driven growth resulted in early secondary cell wall formation in the elongation zone with thicker cell walls and increased lignin. These alterations contrasted the N influence on the secondary xylem, where thinner cell walls with lower lignin contents than in unfertilized trees were formed.</p></div><div type="abstract" xml:lang="en"><p><b>CONCLUSION</b></p><p>This study uncovered that nitrogen-responsive elongation growth of poplar internodes is linked with abiotic stress, suppression of photosynthetic genes and stimulation of genes for cell wall formation. Anatomical and biochemical analysis supported increased accumulation of cell walls and secondary metabolites in the elongation zone. The finding of a nitrogen-responsive cell wall hub may have wider implications for the improvement of tree nitrogen use efficiency and opens new perspectives on the enhancement of wood composition as a feedstock for biofuels.</p></div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">25547614</PMID><DateCompleted><Year>2015</Year><Month>11</Month><Day>02</Day></DateCompleted><DateRevised><Year>2019</Year><Month>01</Month><Day>08</Day></DateRevised><Article PubModel="Electronic"><Journal><ISSN IssnType="Electronic">1471-2229</ISSN><JournalIssue CitedMedium="Internet"><Volume>14</Volume><PubDate><Year>2014</Year><Month>Dec</Month><Day>30</Day></PubDate></JournalIssue><Title>BMC plant biology</Title><ISOAbbreviation>BMC Plant Biol</ISOAbbreviation></Journal><ArticleTitle>Nitrogen-driven stem elongation in poplar is linked with wood modification and gene clusters for stress, photosynthesis and cell wall formation.</ArticleTitle><Pagination><MedlinePgn>391</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1186/s12870-014-0391-3</ELocationID><Abstract><AbstractText Label="BACKGROUND" NlmCategory="BACKGROUND">Nitrogen is an important nutrient, often limiting plant productivity and yield. In poplars, woody crops used as feedstock for renewable resources and bioenergy, nitrogen fertilization accelerates growth of the young, expanding stem internodes. The underlying molecular mechanisms of nitrogen use for extension growth in poplars are not well understood. The aim of this study was to dissect the nitrogen-responsive transcriptional network in the elongation zone of Populus trichocarpa in relation to extension growth and cell wall properties.</AbstractText><AbstractText Label="RESULTS" NlmCategory="RESULTS">Transcriptome analyses in the first two internodes of P. trichocarpa stems grown without or with nitrogen fertilization (5 mM NH4NO3) revealed 1037 more than 2-fold differentially expressed genes (DEGs). Co-expression analysis extracted a network containing about one-third of the DEGs with three main complexes of strongly clustered genes. These complexes represented three main processes that were responsive to N-driven growth: Complex 1 integrated growth processes and stress suggesting that genes with established functions in abiotic and biotic stress are also recruited to coordinate growth. Complex 2 was enriched in genes with decreased transcript abundance and functionally annotated as photosynthetic hub. Complex 3 was a hub for secondary cell wall formation connecting well-known transcription factors that control secondary cell walls with genes for the formation of cellulose, hemicelluloses, and lignin. Anatomical and biochemical analysis supported that N-driven growth resulted in early secondary cell wall formation in the elongation zone with thicker cell walls and increased lignin. These alterations contrasted the N influence on the secondary xylem, where thinner cell walls with lower lignin contents than in unfertilized trees were formed.</AbstractText><AbstractText Label="CONCLUSION" NlmCategory="CONCLUSIONS">This study uncovered that nitrogen-responsive elongation growth of poplar internodes is linked with abiotic stress, suppression of photosynthetic genes and stimulation of genes for cell wall formation. Anatomical and biochemical analysis supported increased accumulation of cell walls and secondary metabolites in the elongation zone. The finding of a nitrogen-responsive cell wall hub may have wider implications for the improvement of tree nitrogen use efficiency and opens new perspectives on the enhancement of wood composition as a feedstock for biofuels.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Euring</LastName><ForeName>Dejuan</ForeName><Initials>D</Initials></Author><Author ValidYN="Y"><LastName>Bai</LastName><ForeName>Hua</ForeName><Initials>H</Initials></Author><Author ValidYN="Y"><LastName>Janz</LastName><ForeName>Dennis</ForeName><Initials>D</Initials></Author><Author ValidYN="Y"><LastName>Polle</LastName><ForeName>Andrea</ForeName><Initials>A</Initials></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType><PublicationType UI="D013485">Research Support, Non-U.S. Gov't</PublicationType></PublicationTypeList><ArticleDate 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sortKey="Janz, Dennis" sort="Janz, Dennis" uniqKey="Janz D" first="Dennis" last="Janz">Dennis Janz</name><name sortKey="Polle, Andrea" sort="Polle, Andrea" uniqKey="Polle A" first="Andrea" last="Polle">Andrea Polle</name></noCountry></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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