Flowering Mutant Experiment
Ontology highlight
ABSTRACT:
ORGANISM(S): Arabidopsis thaliana
PROVIDER: GSE2506 | GEO | 2005/04/09
SECONDARY ACCESSION(S): PRJNA92035
REPOSITORIES: GEO
Similar Datasets
Project description:Collection of Flowering mutants Keywords = flowering, growth and development, gene structure and expression
2010-06-10 | E-GEOD-2506 | biostudies-arrayexpress
Project description:Despite the broad array of roles for epigenetic mechanisms on regulating diverse processes in eukaryotes, no experimental system for the direct assessment of histone function is currently available in plants. In this work, we present the development of a genetic strategy in Arabidopsis thaliana in which modified H4 transgenes can completely replace the expression of endogenous histone H4. Using this strategy, we established a collection of plants expressing different H4 point mutants targeting residues that may be post-translationally modified in vivo. To demonstrate the utility of this new H4 mutant collection, we screened it to uncover substitutions in H4 that alter flowering time. We identified different mutations in the tail (H4R17A) and the globular domain (H4R36A, H4R39K, H4R39A, and H4K44A) of H4 that strongly accelerate the floral transition. Furthermore, we found a conserved regulatory relationship between H4R17 and the ISWI chromatin remodeling complex in plants. Similar to other biological systems, H4R17 regulates nucleosome spacing via ISWI. Overall, this work provides a large set of H4 mutants to the plant epigenetics community that can be used to systematically assess histone H4 function in A. thaliana and a roadmap to replicate this strategy for studying other histone proteins in plants.
2022-07-12 | GSE190317 | GEO
Project description:We identified differentially expressed genes in flail mutants linked to the regulation of flowering through stranded RNA-seq. A genomic rescue fragment of FLAIL (pFLAIL:gFLAIL) introduced in flail mutants can complement expression defects and early flowering, consistent with trans-acting effects of the FLAILRNA. We determined the genomic binding regions of FLAIL by ChIRP-seq. FLAIL binding to chromatin regions promotes the expression of selected flowering repressors.
2022-02-12 | GSE186214 | GEO
Project description:We identified differentially expressed genes in flail mutants linked to the regulation of flowering through stranded RNA-seq. A genomic rescue fragment of FLAIL (pFLAIL:gFLAIL) introduced in flail mutants can complement expression defects and early flowering, consistent with trans-acting effects of the FLAILRNA. We determined the genomic binding regions of FLAIL by ChIRP-seq. FLAIL binding to chromatin regions promotes the expression of selected flowering repressors.
2022-01-10 | GSE186212 | GEO
Project description:Enlargement and doming of the shoot apical meristem (SAM) is a hallmark of the transition from vegetative growth to flowering. While this change is widespread, its role in the flowering process is unknown. The late termination (ltm) tomato mutant shows severely delayed flowering and precocious doming of the vegetative SAM. LTM encodes a kelch domain-containing protein, with no link to known meristem maintenance or flowering time pathways. LTM interacts with the TOPLESS (TPL) corepressor and with several transcription factors, providing specificity for its repressive functions. A sub-group of flowering-associated genes are precociously upregulated in vegetative stages of ltm SAMs, among them, the antiflorigen gene SELF PRUNING (SP). A mutation in SP restored the structure of vegetative SAMs in ltm sp double mutants and late flowering was partially suppressed, suggesting LTM functions to suppress SP in the vegetative SAM. In agreement, SP-overexpressing wild type plants exhibited precocious doming of vegetative SAMs combined with late flowering, as found in ltm plants. Strong flowering signals can result in termination of the SAM, usually by its differentiation into a flower. We propose that activation of a floral antagonist that promotes SAM growth in concert with floral transition protects it from such terminating effects.
2017-04-08 | GSE95114 | GEO
Project description:Enlargement and doming of the shoot apical meristem (SAM) is a hallmark of the transition from vegetative growth to flowering. While this change is widespread, its role in the flowering process is unknown. The late termination (ltm) tomato mutant shows severely delayed flowering and precocious doming of the vegetative SAM. LTM encodes a kelch domain-containing protein, with no link to known meristem maintenance or flowering time pathways. LTM interacts with the TOPLESS (TPL) corepressor and with several transcription factors, providing specificity for its repressive functions. A sub-group of flowering-associated genes are precociously upregulated in vegetative stages of ltm SAMs, among them, the antiflorigen gene SELF PRUNING (SP). A mutation in SP restored the structure of vegetative SAMs in ltm sp double mutants and late flowering was partially suppressed, suggesting LTM functions to suppress SP in the vegetative SAM. In agreement, SP-overexpressing wild type plants exhibited precocious doming of vegetative SAMs combined with late flowering, as found in ltm plants. Strong flowering signals can result in termination of the SAM, usually by its differentiation into a flower. We propose that activation of a floral antagonist that promotes SAM growth in concert with floral transition protects it from such terminating effects.
2017-04-08 | GSE95110 | GEO
Project description:Plants regulate their time to flowering by gathering information from the environment. Photoperiod and temperature are among the most important environmental variables. Suboptimal, but not near-freezing, temperatures regulate flowering through the thermosensory pathway, which overlaps with the autonomous pathway. Here we show that ambient temperature regulates flowering by two genetically distinguishable pathways, one that requires TFL1 and another that requires ELF3. The delay in flowering time observed at lower temperatures was partially suppressed in single elf3 and tfl1 mutants, whereas double elf3 tfl1 mutants were insensitive to temperature. tfl1 mutations abolished the temperature response in cryptochrome mutants that are deficient in photoperiod perception, but not in phyB mutants that have a constitutive photoperiodic response. Contrary to tfl1, elf3 mutations were able to suppress the temperature response in phyB mutants, but not in cryptochrome mutants. The gene expression profile revealed that the tfl1 and elf3 effects are due to the activation of different sets of genes and identified CCA1 and SOC1/AGL20 as being important cross talk points. Finally, genome-wide gene expression analysis strongly suggests a general and complementary role for ELF3 and TFL1 in temperature signalling.
2009-04-18 | GSE15689 | GEO
Project description:Plants sense light and temperature changes to regulate flowering time. The expression of the florigen gene, FLOWERING LOCUS T (FT), peaks in the morning during spring, a different pattern than we observe in the lab. Providing our lab growth conditions with a red/far-red light ratio similar to open field conditions and average natural temperature oscillation is sufficient to mimic the FT expression and flowering time in natural long days. Here, we use RNA-seq to identify and understand the molecular differences between natural growth conditions, conventional lab growth conditions, and supplemented lab growth conditions that mimic natural conditions. Non-NIH grant(s): Grant ID: NSF 1656076 Grant title: Exploring Seasonal Flowering Mechanisms Affiliation: University of Washington Name: Takato Imaizumi
2018-04-01 | GSE110605 | GEO
Project description:Plants use their endogenous clock to regulate many physiological processes related to their survival and adaptability. GIGANTEA (GI), one of the clock proteins, contributes to the maintenance of circadian period length and amplitude and also regulates flowering time and hypocotyl growth in response to day length. In addition to GI, EARLY FLOWERING 4 (ELF4), another clock regulator, also contributes to these processes. However, little is known about the overall interactions between GI and ELF4 in Arabidopsis. In this study, we investigated the genetic interactions between GI and ELF4 in circadian output regulation. The results show that GI is dominant to ELF4 in flowering time determination, but ELF4 is dominant to GI in hypocotyl growth regulation. Moreover, GI and ELF4 have a synergistic effect on endogenous clock regulation. Further, gene expression profiling of gi-2, elf4, and gi-2 elf4 mutants confirmed that GI and ELF4 had differential dominant effects on circadian physiological outputs at dawn and dusk, respectively. This differential dominance of GI and ELF4 provides a potential means to achieve the diversity in the regulation of circadian physiological outputs including flowering time and hypocotyl growth.
2012-07-01 | GSE32938 | GEO
Project description:A great majority of plants synchronize flowering with day length. In rice, the most important environmental cue that triggers flowering is the photoperiod. Here, we show that the s73 mutant, identified in a gamma irradiated Bahia collection, displays early flowering and photoperiodic insensitivity due to a null mutation in the SE5 gene, which encodes an enzyme implicated in phytochrome chromophore biosynthesis. s73 mutant plants showed a number of alterations in the characteristic diurnal expression patterns of master genes involved in photoperiodic control of flowering, resulting in up-regulation of Hd3a, the most important floral integrator. Ehd1, an additional rice floral activator, was also highly expressed in the s73 mutant, suggesting that SE5 represses Ehd1 in wild-type plants. Silencing of Ehd1 in both Bahia and s73 backgrounds implies that SE5 regulates Ehd1 expression. The data also indicate that SE5 confers photoperiodic sensitivity through regulation of Hd1. These results provide direct evidence that phytochromes inhibit flowering affecting both Hd1 and Ehd1 flowering pathways.
2009-12-31 | GSE16796 | GEO