PoplarV1, Main, Exploration, bibRecord, 003951

Cytokinin signaling regulates cambial development in poplar.

Identifieur interne : 003951 ( Main/Exploration ); précédent : 003950; suivant : 003952

Cytokinin signaling regulates cambial development in poplar.

Auteurs : Kaisa Nieminen [Finlande] ; Juha Immanen ; Marjukka Laxell ; Leila Kauppinen ; Petr Tarkowski ; Karel Dolezal ; Sari T Htiharju ; Annakaisa Elo ; Mélanie Decourteix ; Karin Ljung ; Rishikesh Bhalerao ; Kaija Keinonen ; Victor A. Albert ; Yk Helariutta

Source :

Proceedings of the National Academy of Sciences of the United States of America [ 1091-6490 ] ; 2008.

RBID : pubmed:19064928

Descripteurs français

KwdFr :
- Betula (composition chimique), Betula (croissance et développement), Betula (génétique), Betula (métabolisme), Cytokinine (biosynthèse), Cytokinine (génétique), Cytokinine (physiologie), Données de séquences moléculaires (MeSH), Expression des gènes (MeSH), Gènes de plante (MeSH), Oxidoreductases (génétique), Populus (croissance et développement), Populus (cytologie), Populus (génétique), Populus (métabolisme), Protéines d'Arabidopsis (génétique), Séquence conservée (MeSH), Séquence nucléotidique (MeSH), Transduction du signal (MeSH), Végétaux génétiquement modifiés (MeSH).
MESH :
- biosynthèse : Cytokinine.
- composition chimique : Betula.
- croissance et développement : Betula, Populus.
- cytologie : Populus.
- génétique : Betula, Cytokinine, Oxidoreductases, Populus, Protéines d'Arabidopsis.
- métabolisme : Betula, Populus.
- physiologie : Cytokinine.
- Données de séquences moléculaires, Expression des gènes, Gènes de plante, Séquence conservée, Séquence nucléotidique, Transduction du signal, Végétaux génétiquement modifiés.

English descriptors

KwdEn :
- Arabidopsis Proteins (genetics), Base Sequence (MeSH), Betula (chemistry), Betula (genetics), Betula (growth & development), Betula (metabolism), Conserved Sequence (MeSH), Cytokinins (biosynthesis), Cytokinins (genetics), Cytokinins (physiology), Gene Expression (MeSH), Genes, Plant (MeSH), Molecular Sequence Data (MeSH), Oxidoreductases (genetics), Plants, Genetically Modified (MeSH), Populus (cytology), Populus (genetics), Populus (growth & development), Populus (metabolism), Signal Transduction (MeSH).
MESH :
- chemical , biosynthesis : Cytokinins.
- chemical , genetics : Arabidopsis Proteins, Cytokinins, Oxidoreductases.
- chemistry : Betula.
- cytology : Populus.
- genetics : Betula, Populus.
- growth & development : Betula, Populus.
- metabolism : Betula, Populus.
- chemical , physiology : Cytokinins.
- Base Sequence, Conserved Sequence, Gene Expression, Genes, Plant, Molecular Sequence Data, Plants, Genetically Modified, Signal Transduction.

Abstract

Although a substantial proportion of plant biomass originates from the activity of vascular cambium, the molecular basis of radial plant growth is still largely unknown. To address whether cytokinins are required for cambial activity, we studied cytokinin signaling across the cambial zones of 2 tree species, poplar (Populus trichocarpa) and birch (Betula pendula). We observed an expression peak for genes encoding cytokinin receptors in the dividing cambial cells. We reduced cytokinin levels endogenously by engineering transgenic poplar trees (P. tremula x tremuloides) to express a cytokinin catabolic gene, Arabidopsis CYTOKININ OXIDASE 2, under the promoter of a birch CYTOKININ RECEPTOR 1 gene. Transgenic trees showed reduced concentration of a biologically active cytokinin, correlating with impaired cytokinin responsiveness. In these trees, both apical and radial growth was compromised. However, radial growth was more affected, as illustrated by a thinner stem diameter than in WT at same height. To dissect radial from apical growth inhibition, we performed a reciprocal grafting experiment. WT scion outgrew the diameter of transgenic stock, implicating cytokinin activity as a direct determinant of radial growth. The reduced radial growth correlated with a reduced number of cambial cell layers. Moreover, expression of a cytokinin primary response gene was dramatically reduced in the thin-stemmed transgenic trees. Thus, a reduced level of cytokinin signaling is the primary basis for the impaired cambial growth observed. Together, our results show that cytokinins are major hormonal regulators required for cambial development.

DOI: 10.1073/pnas.0805617106
PubMed: 19064928
PubMed Central: PMC2604918

Affiliations:

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

to stream Main, to step Corpus: 003720
to stream Main, to step Curation: 003720

Le document en format XML

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<front><div type="abstract" xml:lang="en">Although a substantial proportion of plant biomass originates from the activity of vascular cambium, the molecular basis of radial plant growth is still largely unknown. To address whether cytokinins are required for cambial activity, we studied cytokinin signaling across the cambial zones of 2 tree species, poplar (Populus trichocarpa) and birch (Betula pendula). We observed an expression peak for genes encoding cytokinin receptors in the dividing cambial cells. We reduced cytokinin levels endogenously by engineering transgenic poplar trees (P. tremula x tremuloides) to express a cytokinin catabolic gene, Arabidopsis CYTOKININ OXIDASE 2, under the promoter of a birch CYTOKININ RECEPTOR 1 gene. Transgenic trees showed reduced concentration of a biologically active cytokinin, correlating with impaired cytokinin responsiveness. In these trees, both apical and radial growth was compromised. However, radial growth was more affected, as illustrated by a thinner stem diameter than in WT at same height. To dissect radial from apical growth inhibition, we performed a reciprocal grafting experiment. WT scion outgrew the diameter of transgenic stock, implicating cytokinin activity as a direct determinant of radial growth. The reduced radial growth correlated with a reduced number of cambial cell layers. Moreover, expression of a cytokinin primary response gene was dramatically reduced in the thin-stemmed transgenic trees. Thus, a reduced level of cytokinin signaling is the primary basis for the impaired cambial growth observed. Together, our results show that cytokinins are major hormonal regulators required for cambial development.</div>
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<Abstract><AbstractText>Although a substantial proportion of plant biomass originates from the activity of vascular cambium, the molecular basis of radial plant growth is still largely unknown. To address whether cytokinins are required for cambial activity, we studied cytokinin signaling across the cambial zones of 2 tree species, poplar (Populus trichocarpa) and birch (Betula pendula). We observed an expression peak for genes encoding cytokinin receptors in the dividing cambial cells. We reduced cytokinin levels endogenously by engineering transgenic poplar trees (P. tremula x tremuloides) to express a cytokinin catabolic gene, Arabidopsis CYTOKININ OXIDASE 2, under the promoter of a birch CYTOKININ RECEPTOR 1 gene. Transgenic trees showed reduced concentration of a biologically active cytokinin, correlating with impaired cytokinin responsiveness. In these trees, both apical and radial growth was compromised. However, radial growth was more affected, as illustrated by a thinner stem diameter than in WT at same height. To dissect radial from apical growth inhibition, we performed a reciprocal grafting experiment. WT scion outgrew the diameter of transgenic stock, implicating cytokinin activity as a direct determinant of radial growth. The reduced radial growth correlated with a reduced number of cambial cell layers. Moreover, expression of a cytokinin primary response gene was dramatically reduced in the thin-stemmed transgenic trees. Thus, a reduced level of cytokinin signaling is the primary basis for the impaired cambial growth observed. Together, our results show that cytokinins are major hormonal regulators required for cambial development.</AbstractText>
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Cytokinin signaling regulates cambial development in poplar.

Cytokinin signaling regulates cambial development in poplar.

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