PoplarV1, Main, Exploration, bibRecord, 002D32

Repression of gibberellin biosynthesis or signaling produces striking alterations in poplar growth, morphology, and flowering.

Identifieur interne : 002D32 ( Main/Exploration ); précédent : 002D31; suivant : 002D33

Repression of gibberellin biosynthesis or signaling produces striking alterations in poplar growth, morphology, and flowering.

Auteurs : Christine Zawaski [États-Unis] ; Mahita Kadmiel ; Jim Pickens ; Cathleen Ma ; Steven Strauss ; Victor Busov

Source :

Planta [ 1432-2048 ] ; 2011.

RBID : pubmed:21792553

Descripteurs français

English descriptors

KwdEn :
- Arabidopsis (genetics), Flowers (anatomy & histology), Flowers (genetics), Flowers (growth & development), Gene Expression Regulation, Plant (MeSH), Genes, Plant (genetics), Gibberellins (metabolism), Mixed Function Oxygenases (genetics), Mixed Function Oxygenases (metabolism), Phenotype (MeSH), Plant Leaves (anatomy & histology), Plant Leaves (genetics), Plant Leaves (growth & development), Plant Proteins (genetics), Plant Proteins (metabolism), Plant Stems (anatomy & histology), Plant Stems (genetics), Plant Stems (growth & development), Plants, Genetically Modified (MeSH), Populus (anatomy & histology), Populus (genetics), Populus (growth & development), Populus (physiology), Principal Component Analysis (MeSH), Protein Structure, Tertiary (genetics), Protein Structure, Tertiary (physiology), Regression Analysis (MeSH), Signal Transduction (physiology), Transgenes (genetics), Trees (MeSH).
MESH :
- chemical , genetics : Mixed Function Oxygenases, Plant Proteins.
- chemical , metabolism : Gibberellins, Mixed Function Oxygenases, Plant Proteins.
- anatomy & histology : Flowers, Plant Leaves, Plant Stems, Populus.
- genetics : Arabidopsis, Flowers, Genes, Plant, Plant Leaves, Plant Stems, Populus, Protein Structure, Tertiary, Transgenes.
- growth & development : Flowers, Plant Leaves, Plant Stems, Populus.
- physiology : Populus, Protein Structure, Tertiary, Signal Transduction.
- Gene Expression Regulation, Plant, Phenotype, Plants, Genetically Modified, Principal Component Analysis, Regression Analysis, Trees.

Abstract

We modified gibberellin (GA) metabolism and signaling in transgenic poplars using dominant transgenes and studied their effects for 3 years under field conditions. The transgenes that we employed either reduced the bioactive GAs, or attenuated their signaling. The majority of transgenic trees had significant and in many cases dramatic changes in height, crown architecture, foliage morphology, flowering onset, floral structure, and vegetative phenology. Most transgenes elicited various levels of height reduction consistent with the roles of GA in elongation growth. Several other growth traits were proportionally reduced, including branch length, internode distance, and leaf length. In contrast to elongation growth, stem diameter growth was much less affected, suggesting that semi-dwarf trees in dense stands might provide high levels of biomass production and carbon sequestration. The severity of phenotypic effects was strongly correlated with transgene expression among independent transgenic events, but often in a non-linear manner, the form of which varied widely among constructs. The majority of semi-dwarfed, transgenic plants showed delayed bud flush and early bud set, and expression of a native GAI transgene accelerated first time flowering in the field. All of the phenotypic changes observed in multiple years were stable over the 3 years of field study. Our results suggest that transgenic modification of GA action may be useful for producing semi-dwarf trees with modified growth and morphology for horticulture and other uses.

DOI: 10.1007/s00425-011-1485-x
PubMed: 21792553

Affiliations:

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<term>Flowers (growth & development)</term>
<term>Gene Expression Regulation, Plant (MeSH)</term>
<term>Genes, Plant (genetics)</term>
<term>Gibberellins (metabolism)</term>
<term>Mixed Function Oxygenases (genetics)</term>
<term>Mixed Function Oxygenases (metabolism)</term>
<term>Phenotype (MeSH)</term>
<term>Plant Leaves (anatomy & histology)</term>
<term>Plant Leaves (genetics)</term>
<term>Plant Leaves (growth & development)</term>
<term>Plant Proteins (genetics)</term>
<term>Plant Proteins (metabolism)</term>
<term>Plant Stems (anatomy & histology)</term>
<term>Plant Stems (genetics)</term>
<term>Plant Stems (growth & development)</term>
<term>Plants, Genetically Modified (MeSH)</term>
<term>Populus (anatomy & histology)</term>
<term>Populus (genetics)</term>
<term>Populus (growth & development)</term>
<term>Populus (physiology)</term>
<term>Principal Component Analysis (MeSH)</term>
<term>Protein Structure, Tertiary (genetics)</term>
<term>Protein Structure, Tertiary (physiology)</term>
<term>Regression Analysis (MeSH)</term>
<term>Signal Transduction (physiology)</term>
<term>Transgenes (genetics)</term>
<term>Trees (MeSH)</term>
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<term>Analyse en composantes principales (MeSH)</term>
<term>Arabidopsis (génétique)</term>
<term>Arbres (MeSH)</term>
<term>Feuilles de plante (anatomie et histologie)</term>
<term>Feuilles de plante (croissance et développement)</term>
<term>Feuilles de plante (génétique)</term>
<term>Fleurs (anatomie et histologie)</term>
<term>Fleurs (croissance et développement)</term>
<term>Fleurs (génétique)</term>
<term>Gibbérellines (métabolisme)</term>
<term>Gènes de plante (génétique)</term>
<term>Mixed function oxygenases (génétique)</term>
<term>Mixed function oxygenases (métabolisme)</term>
<term>Phénotype (MeSH)</term>
<term>Populus (anatomie et histologie)</term>
<term>Populus (croissance et développement)</term>
<term>Populus (génétique)</term>
<term>Populus (physiologie)</term>
<term>Protéines végétales (génétique)</term>
<term>Protéines végétales (métabolisme)</term>
<term>Régulation de l'expression des gènes végétaux (MeSH)</term>
<term>Structure tertiaire des protéines (génétique)</term>
<term>Structure tertiaire des protéines (physiologie)</term>
<term>Tiges de plante (anatomie et histologie)</term>
<term>Tiges de plante (croissance et développement)</term>
<term>Tiges de plante (génétique)</term>
<term>Transduction du signal (physiologie)</term>
<term>Transgènes (génétique)</term>
<term>Végétaux génétiquement modifiés (MeSH)</term>
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<term>Plant Proteins</term>
</keywords>
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<term>Mixed Function Oxygenases</term>
<term>Plant Proteins</term>
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<term>Populus</term>
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<term>Populus</term>
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<term>Populus</term>
<term>Protein Structure, Tertiary</term>
<term>Transgenes</term>
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<term>Plant Leaves</term>
<term>Plant Stems</term>
<term>Populus</term>
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<term>Feuilles de plante</term>
<term>Fleurs</term>
<term>Gènes de plante</term>
<term>Mixed function oxygenases</term>
<term>Populus</term>
<term>Protéines végétales</term>
<term>Structure tertiaire des protéines</term>
<term>Tiges de plante</term>
<term>Transgènes</term>
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<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Gibbérellines</term>
<term>Mixed function oxygenases</term>
<term>Protéines végétales</term>
</keywords>
<keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Populus</term>
<term>Structure tertiaire des protéines</term>
<term>Transduction du signal</term>
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<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Populus</term>
<term>Protein Structure, Tertiary</term>
<term>Signal Transduction</term>
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<term>Plants, Genetically Modified</term>
<term>Principal Component Analysis</term>
<term>Regression Analysis</term>
<term>Trees</term>
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<term>Analyse en composantes principales</term>
<term>Arbres</term>
<term>Phénotype</term>
<term>Régulation de l'expression des gènes végétaux</term>
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<front><div type="abstract" xml:lang="en">We modified gibberellin (GA) metabolism and signaling in transgenic poplars using dominant transgenes and studied their effects for 3 years under field conditions. The transgenes that we employed either reduced the bioactive GAs, or attenuated their signaling. The majority of transgenic trees had significant and in many cases dramatic changes in height, crown architecture, foliage morphology, flowering onset, floral structure, and vegetative phenology. Most transgenes elicited various levels of height reduction consistent with the roles of GA in elongation growth. Several other growth traits were proportionally reduced, including branch length, internode distance, and leaf length. In contrast to elongation growth, stem diameter growth was much less affected, suggesting that semi-dwarf trees in dense stands might provide high levels of biomass production and carbon sequestration. The severity of phenotypic effects was strongly correlated with transgene expression among independent transgenic events, but often in a non-linear manner, the form of which varied widely among constructs. The majority of semi-dwarfed, transgenic plants showed delayed bud flush and early bud set, and expression of a native GAI transgene accelerated first time flowering in the field. All of the phenotypic changes observed in multiple years were stable over the 3 years of field study. Our results suggest that transgenic modification of GA action may be useful for producing semi-dwarf trees with modified growth and morphology for horticulture and other uses.</div>
</front>
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<Abstract><AbstractText>We modified gibberellin (GA) metabolism and signaling in transgenic poplars using dominant transgenes and studied their effects for 3 years under field conditions. The transgenes that we employed either reduced the bioactive GAs, or attenuated their signaling. The majority of transgenic trees had significant and in many cases dramatic changes in height, crown architecture, foliage morphology, flowering onset, floral structure, and vegetative phenology. Most transgenes elicited various levels of height reduction consistent with the roles of GA in elongation growth. Several other growth traits were proportionally reduced, including branch length, internode distance, and leaf length. In contrast to elongation growth, stem diameter growth was much less affected, suggesting that semi-dwarf trees in dense stands might provide high levels of biomass production and carbon sequestration. The severity of phenotypic effects was strongly correlated with transgene expression among independent transgenic events, but often in a non-linear manner, the form of which varied widely among constructs. The majority of semi-dwarfed, transgenic plants showed delayed bud flush and early bud set, and expression of a native GAI transgene accelerated first time flowering in the field. All of the phenotypic changes observed in multiple years were stable over the 3 years of field study. Our results suggest that transgenic modification of GA action may be useful for producing semi-dwarf trees with modified growth and morphology for horticulture and other uses.</AbstractText>
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Repression of gibberellin biosynthesis or signaling produces striking alterations in poplar growth, morphology, and flowering.

Repression of gibberellin biosynthesis or signaling produces striking alterations in poplar growth, morphology, and flowering.

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