PoplarV1, Main, Exploration, bibRecord, 002A86

FLOWERING BHLH transcriptional activators control expression of the photoperiodic flowering regulator CONSTANS in Arabidopsis.

Identifieur interne : 002A86 ( Main/Exploration ); précédent : 002A85; suivant : 002A87

FLOWERING BHLH transcriptional activators control expression of the photoperiodic flowering regulator CONSTANS in Arabidopsis.

Auteurs : Shogo Ito [États-Unis] ; Young Hun Song ; Anna R. Josephson-Day ; Ryan J. Miller ; Ghislain Breton ; Richard G. Olmstead ; Takato Imaizumi

Source :

Proceedings of the National Academy of Sciences of the United States of America [ 1091-6490 ] ; 2012.

RBID : pubmed:22334645

Descripteurs français

English descriptors

KwdEn :
- Amino Acid Sequence (MeSH), Arabidopsis (genetics), Arabidopsis (physiology), Arabidopsis Proteins (genetics), Arabidopsis Proteins (physiology), Conserved Sequence (MeSH), DNA-Binding Proteins (physiology), Flowers (growth & development), Gene Expression Regulation, Plant (physiology), Genes, Plant (MeSH), Genes, Reporter (MeSH), Molecular Sequence Data (MeSH), Oryza (genetics), Photoperiod (MeSH), Plants, Genetically Modified (MeSH), Populus (genetics), Promoter Regions, Genetic (MeSH), Recombinant Fusion Proteins (biosynthesis), Recombinant Fusion Proteins (genetics), Sequence Alignment (MeSH), Sequence Homology, Amino Acid (MeSH), Species Specificity (MeSH), Trans-Activators (genetics), Trans-Activators (physiology), Transcription Factors (physiology), Transcription, Genetic (MeSH).
MESH :
- chemical , biosynthesis : Recombinant Fusion Proteins.
- chemical , genetics : Arabidopsis Proteins, Recombinant Fusion Proteins, Trans-Activators.
- genetics : Arabidopsis, Oryza, Populus.
- growth & development : Flowers.
- physiology : Arabidopsis, Arabidopsis Proteins, DNA-Binding Proteins, Gene Expression Regulation, Plant, Trans-Activators, Transcription Factors.
- Amino Acid Sequence, Conserved Sequence, Genes, Plant, Genes, Reporter, Molecular Sequence Data, Photoperiod, Plants, Genetically Modified, Promoter Regions, Genetic, Sequence Alignment, Sequence Homology, Amino Acid, Species Specificity, Transcription, Genetic.

Abstract

Many plants monitor day-length changes throughout the year and use the information to precisely regulate the timing of seasonal flowering for maximum reproductive success. In Arabidopsis thaliana, transcriptional regulation of the CONSTANS (CO) gene and posttranslational regulation of CO protein are crucial mechanisms for proper day-length measurement in photoperiodic flowering. Currently, the CYCLING DOF FACTOR proteins are the only transcription factors known to directly regulate CO gene expression, and the mechanisms that directly activate CO transcription have remained unknown. Here we report the identification of four CO transcriptional activators, named FLOWERING BHLH 1 (FBH1), FBH2, FBH3, and FBH4. All FBH proteins are related basic helix-loop-helix-type transcription factors that preferentially bind to the E-box cis-elements in the CO promoter. Overexpression of all FBH genes drastically elevated CO levels and caused early flowering regardless of photoperiod, whereas CO levels were reduced in the fbh quadruple mutants. In addition, FBH1 is expressed in the vascular tissue and bound near the transcription start site of the CO promoter in vivo. Furthermore, FBH homologs in poplar and rice induced CO expression in Arabidopsis. These results indicate that FBH proteins positively regulate CO transcription for photoperiodic flowering and that this mechanism may be conserved in diverse plant species. Our results suggest that the diurnal CO expression pattern is generated by a concert of redundant functions of positive and negative transcriptional regulators.

DOI: 10.1073/pnas.1118876109
PubMed: 22334645
PubMed Central: PMC3295255

Affiliations:

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Le document en format XML

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<term>Arabidopsis Proteins (physiology)</term>
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<term>Arabidopsis (physiologie)</term>
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<term>Facteurs de transcription (physiologie)</term>
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<term>Gènes de plante (MeSH)</term>
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<term>Protéines d'Arabidopsis (physiologie)</term>
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<term>Protéines de liaison à l'ADN (physiologie)</term>
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<term>Similitude de séquences d'acides aminés (MeSH)</term>
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<term>Sequence Alignment</term>
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<front><div type="abstract" xml:lang="en">Many plants monitor day-length changes throughout the year and use the information to precisely regulate the timing of seasonal flowering for maximum reproductive success. In Arabidopsis thaliana, transcriptional regulation of the CONSTANS (CO) gene and posttranslational regulation of CO protein are crucial mechanisms for proper day-length measurement in photoperiodic flowering. Currently, the CYCLING DOF FACTOR proteins are the only transcription factors known to directly regulate CO gene expression, and the mechanisms that directly activate CO transcription have remained unknown. Here we report the identification of four CO transcriptional activators, named FLOWERING BHLH 1 (FBH1), FBH2, FBH3, and FBH4. All FBH proteins are related basic helix-loop-helix-type transcription factors that preferentially bind to the E-box cis-elements in the CO promoter. Overexpression of all FBH genes drastically elevated CO levels and caused early flowering regardless of photoperiod, whereas CO levels were reduced in the fbh quadruple mutants. In addition, FBH1 is expressed in the vascular tissue and bound near the transcription start site of the CO promoter in vivo. Furthermore, FBH homologs in poplar and rice induced CO expression in Arabidopsis. These results indicate that FBH proteins positively regulate CO transcription for photoperiodic flowering and that this mechanism may be conserved in diverse plant species. Our results suggest that the diurnal CO expression pattern is generated by a concert of redundant functions of positive and negative transcriptional regulators.</div>
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<Abstract><AbstractText>Many plants monitor day-length changes throughout the year and use the information to precisely regulate the timing of seasonal flowering for maximum reproductive success. In Arabidopsis thaliana, transcriptional regulation of the CONSTANS (CO) gene and posttranslational regulation of CO protein are crucial mechanisms for proper day-length measurement in photoperiodic flowering. Currently, the CYCLING DOF FACTOR proteins are the only transcription factors known to directly regulate CO gene expression, and the mechanisms that directly activate CO transcription have remained unknown. Here we report the identification of four CO transcriptional activators, named FLOWERING BHLH 1 (FBH1), FBH2, FBH3, and FBH4. All FBH proteins are related basic helix-loop-helix-type transcription factors that preferentially bind to the E-box cis-elements in the CO promoter. Overexpression of all FBH genes drastically elevated CO levels and caused early flowering regardless of photoperiod, whereas CO levels were reduced in the fbh quadruple mutants. In addition, FBH1 is expressed in the vascular tissue and bound near the transcription start site of the CO promoter in vivo. Furthermore, FBH homologs in poplar and rice induced CO expression in Arabidopsis. These results indicate that FBH proteins positively regulate CO transcription for photoperiodic flowering and that this mechanism may be conserved in diverse plant species. Our results suggest that the diurnal CO expression pattern is generated by a concert of redundant functions of positive and negative transcriptional regulators.</AbstractText>
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FLOWERING BHLH transcriptional activators control expression of the photoperiodic flowering regulator CONSTANS in Arabidopsis.

FLOWERING BHLH transcriptional activators control expression of the photoperiodic flowering regulator CONSTANS in Arabidopsis.

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