The Evening Complex integrates photoperiod signals to control flowering in rice [ChIP-Seq]
Ontology highlight
ABSTRACT:
ORGANISM(S): Oryza sativa Japonica Group
PROVIDER: GSE181831 | GEO | 2022/05/24
REPOSITORIES: GEO
Similar Datasets
Project description:This study aim to understand how the long and short day flowering pathways are integrated and the mechanism of photoperiod perception in rice. Trascriptome at different time points under LD and SD conditions reveal that photoperiodism in rice is controlled by the evening complex. Mutants in LUX ARRYTHMO (LUX) and EARLY FLOWERING3 (ELF3) orthologs abolish flowering. We show that light causes a rapid and sustained degradation of ELF3-1, and this response is dependent on phyB. ChIP-seq of ELF3 and LUX reveal that EC controls both LD and SD flowering pathways by directly binding and suppressing the expression of key floral repressors, including PRR7 orthologs and Ghd7.
2022-05-24 | GSE181833 | GEO
Project description:Heading date1(Hd1) is a critical regulator controlling rice flowering time, which promotes flowering under short-day (SD) conditions and represses flowering under long-day (LD) conditions. In our previous study (Luan et al., 2009), we identified a rice mutant, hd1-3, in which the Hd1 gene was deficient due to several insertions/deletions in the coding region. To search for downstream genes regulated by Hd1, we performed microarray analysis of hd1-3 mutant and the wild-type Zhonghua11 under both SD and LD conditions. According to the microarray results, SDG712 gene was significantly downregulated in the hd1-3 mutant, indicating that SDG712 gene may acts downstream of Hd1, and may functions in rice flowering time regulation.
2021-02-04 | GSE166053 | GEO
Project description:Plant responses to the environment are shaped by the external stimuli and internal signaling pathways. In both the model plant Arabidopsis thaliana and crop species, circadian clock factors have been identified as critical for growth, flowering and circadian rhythms. Outside of A. thaliana, however, little is known about the molecular function of clock genes. Therefore, we sought to compare the function of Brachypodium distachyon and Seteria viridis orthologs of EARLY FLOWERING3, a key clock gene in A. thaliana. To identify both cycling genes and putative ELF3 functional orthologs in S. viridis, a circadian RNA-seq dataset and online query tool (Diel Explorer) was generated as community resource to explore expression profiles of Setaria genes under constant conditions after photo- or thermo-entrainment. The function of ELF3 orthologs from A. thaliana, B. distachyon, and S. viridis were tested for complementation of an elf3 mutation in A. thaliana. Despite comparably low sequence identity versus AtELF3 (< 37%), both monocot orthologs were capable of rescuing hypocotyl elongation, flowering time and arrhythmic clock phenotypes. Molecular analysis using affinity purification and mass spectrometry to compare physical interactions also found that BdELF3 and SvELF3 could be integrated into similar complexes and networks as AtELF3, including forming a composite evening complex. Thus, we find that, despite 180 million years of separation, BdELF3 and SvELF3 can functionally complement loss of ELF3 at the molecular and physiological level.
2018-01-08 | PXD006352 | Pride
Project description:Flowering in plants is a very dynamic and synchronized process where various cues including age, day-length, temperature and endogenous hormones fine-tune the timing of flowering for reproductive success. Arabidopsis thaliana is a facultative long day plant where long-day (LD) photoperiod promotes flowering. Arabidopsis still flowers under short-day (SD) conditions, albeit much later than LD conditions. Although, factors regulating the photoperiodic LD pathway have been extensively investigated, the SD pathway is much less understood. Here we identified a critical transcription factor called bHLH93 (basic Helix-Loop-Helix 93) that is essential to induce flowering specifically under SD conditions in Arabidopsis. bhlh93 mutants do not flower from primary meristem under SD conditions, but flowers similar to wild type under LD conditions. The late flowering phenotype is rescued by exogenous application of GA, suggesting that bHLH93 acts upstream of GA pathway to promote flowering. Double mutant studies showed that bhlh93 is epistatic to phyB and soc1 genes under SD conditions. bHLH93 is expressed at the meristematic regions and its expression peaks at 8 hours after dawn under SD conditions. As expected, the bHLH93 is localized in the nucleus. Taken together, these data suggest that bHLH93 is a key transcription factor necessary for Arabidopsis thaliana to evolve as a facultative plant.
2011-12-31 | GSE29786 | GEO
Project description:The Evening Complex (EC) is a core component of the circadian clock, which represses target gene expression at the end of the day and integrates temperature information in order to coordinate environmental and endogenous signals. Despite its importance, the mechanism of EC function remains unknown. Here we show that the EC recruits repressive chromatin domains to regulate the evening transcriptome. The EC component EARLY FLOWERING 3 (ELF3) directly interacts with a protein from the Swi2/Snf2-Related 1 (SWR1) complex to control deposition of H2A.Z-nucleosomes at the EC target genes. The SWR1 components display a circadian oscillation in gene expression with a peak at dusk, suggesting that the circadian clock controls the expression and function of SWR1. In turn, SWR1 is required for the circadian clockwork as defects in SWR1 activity alters morning-expressed genes. The EC-SWR1 complex binds to the promoters of the core clock genes PSEUDORESPONSE REGULATOR 7 (PRR7) and PRR9 and catalyzes H2A.Z deposition coincident with their repression at dusk. This provides a mechanism by which the circadian clock temporally establishes repressive chromatin domains to shape oscillatory gene expression around dusk.
2020-01-22 | GSE109101 | GEO
Project description:Plants trigger leaf senescence to relocate energy and nutrients from aging leaves to developing tissues or storage organs to optimize the growth and reproduction under limited nutrients and energy conditions. Jasmonate signaling is one of the major endogenous hormone signals to induced leaf senescence in Arabidopsis. However, whether circadian clock will gate Jasmonate signaling to induce leaf senescence and the underlying precise mechanism is unclear. Here we find that the Evening Complex (EC) of core oscillator closely regulates leaf senescence. To identify the underlying mechanism of EC regulating leaf senescence, we conducted RNA-sequencing. Transcriptomic data reveals Evening complex extensively involves into JA signal transduction and responses. Moreover, the mutants of ELF3, ELF4 and LUX universly display the accelerated JA-induced leaf senescence phenotype, while their overexpression lines act reversely. In accordance with the transcript levels of JA immediate early induced JA-responsive gene MYC2 are up-regulated in lux mutants. Futhermore we demonstrated LUX can bind to to the promoter of MYC2 in vivo to represses its transcription. In addition, the accelerated JA-induced leaf senescence in mutants of evening complex can be overturned by myc2, myc3 and myc4 mutants redundantly. Collectively, our findings demonstrated the underlying molecular basis for circadian clock gating jasmonate signaling to induce leaf senescence through the module of evening complex to directly repressing MYC2 transcription. This novel established molecular module also refines complicated nodes between circadian clock and jasmonate signal in Arabidopsis.
2018-02-06 | GSE99290 | GEO
Project description:Flowering in plants is a very dynamic and synchronized process where various cues including age, day-length, temperature and endogenous hormones fine-tune the timing of flowering for reproductive success. Arabidopsis thaliana is a facultative long day plant where long-day (LD) photoperiod promotes flowering. Arabidopsis still flowers under short-day (SD) conditions, albeit much later than LD conditions. Although, factors regulating the photoperiodic LD pathway have been extensively investigated, the SD pathway is much less understood. Here we identified a critical transcription factor called bHLH93 (basic Helix-Loop-Helix 93) that is essential to induce flowering specifically under SD conditions in Arabidopsis. bhlh93 mutants do not flower from primary meristem under SD conditions, but flowers similar to wild type under LD conditions. The late flowering phenotype is rescued by exogenous application of GA, suggesting that bHLH93 acts upstream of GA pathway to promote flowering. Double mutant studies showed that bhlh93 is epistatic to phyB and soc1 genes under SD conditions. bHLH93 is expressed at the meristematic regions and its expression peaks at 8 hours after dawn under SD conditions. As expected, the bHLH93 is localized in the nucleus. Taken together, these data suggest that bHLH93 is a key transcription factor necessary for Arabidopsis thaliana to evolve as a facultative plant. Stratified Col-0 and bhlh93-1 mutants seeds in cold for 4 days. Transferred to Short Day (8h light and 16h dark) chamber and harvested samples after 10days. Tissue was harvested 0 and 4 hour after light was turned on.
2011-12-31 | E-GEOD-29786 | biostudies-arrayexpress
Project description:Repressive epigenetic modification histone H3 lysine 27 tri-methylation (H3K27me3) marks many agronomically important genes in plants. However, H3K27me3-associated three-dimensional (3D) genome architecture and its regulatory functions in rice flowering time remain unclear. In this study, we map H3K27me3-associated genome topology using long-read ChIA-PET and reveal extensive chromatin loops among H3K27me3-marked regions in different rice varieties and tissues. Multiple H3K27me3-associated chromatin loops usually tether together and further form repressive chromatin interacting domains (RIDs), which provide structural bases for the regulation of the co-modification and co-expression of interacting genes. Surprisingly, we identified extensive chromatin loops between the rice florigen genes Hd3a and RFT1, and frequent chromatin interactions between the positive flowering regulator Ehd1 on the chromosome 10 and Hd3a/ RFT1 loci on the chromosome 6. These results suggest that flowering genes might form a Ehd1-Hd3a/RFT1-centered spatial gene cluster in rice. We also demonstrate the flowering regulator protein complexes comprising Ghd7, Ghd8, and Hd1 could bind to the Ehd1-Hd3a/RFT1 spatial gene cluster. In addition, liquid-liquid phase separation of Ghd7 and Hd1, as well as the essentially synchronous expression of Ehd1 and Hd3a suggest that this spatial gene cluster acts as a regulatory hub to coordinately regulates the expression of Ehd1-Hd3a. This work uncovers the frame of integrated cis and trans molecular mechanism underlying transcriptional regulation of florigen genes in rice.
2022-09-28 | GSE214069 | GEO
Project description:Repressive epigenetic modification histone H3 lysine 27 tri-methylation (H3K27me3) marks many agronomically important genes in plants. However, H3K27me3-associated three-dimensional (3D) genome architecture and its regulatory functions in rice flowering time remain unclear. In this study, we map H3K27me3-associated genome topology using long-read ChIA-PET and reveal extensive chromatin loops among H3K27me3-marked regions in different rice varieties and tissues. Multiple H3K27me3-associated chromatin loops usually tether together and further form repressive chromatin interacting domains (RIDs), which provide structural bases for the regulation of the co-modification and co-expression of interacting genes. Surprisingly, we identified extensive chromatin loops between the rice florigen genes Hd3a and RFT1, and frequent chromatin interactions between the positive flowering regulator Ehd1 on the chromosome 10 and Hd3a/ RFT1 loci on the chromosome 6. These results suggest that flowering genes might form a Ehd1-Hd3a/RFT1-centered spatial gene cluster in rice. We also demonstrate the flowering regulator protein complexes comprising Ghd7, Ghd8, and Hd1 could bind to the Ehd1-Hd3a/RFT1 spatial gene cluster. In addition, liquid-liquid phase separation of Ghd7 and Hd1, as well as the essentially synchronous expression of Ehd1 and Hd3a suggest that this spatial gene cluster acts as a regulatory hub to coordinately regulates the expression of Ehd1-Hd3a. This work uncovers the frame of integrated cis and trans molecular mechanism underlying transcriptional regulation of florigen genes in rice.
2022-09-28 | GSE214050 | GEO
Project description:Nongken 58S is photoperiod-sensitive genic male sterile (PGMS) rice. Its pollens are fully sterile when it is treated with LD condition from glume primordium differentiation stage to pistil/stamen primordium forming stage, and its pollens are fertile when treated with SD condition during these stages. We used microarrays to detail the global programme of leaf gene expression under LD and SD condition for investigating the transcriptomes in the male sterility transition in PGMS rice to find out the genes related to this transition
2012-07-30 | GSE29820 | GEO