Effect of photoperiod on gene expressions in guard cells.
Ontology highlight
ABSTRACT:
ORGANISM(S): Arabidopsis thaliana
PROVIDER: GSE104436 | GEO | 2019/07/22
REPOSITORIES: GEO
Similar Datasets
Project description:In plants, epidermal guard cells integrate and respond to numerous environmental signals to control stomatal pore apertures thereby regulating gas exchange. Chromatin structure controls transcription factor access to the genome, but whether large-scale chromatin remodeling occurs in guard cells during stomatal movements, and in response to the hormone abscisic acid (ABA) in general, remain unknown. Here we isolate guard cell nuclei from Arabidopsis thaliana plants to examine whether the physiological signals, ABA and CO2, regulate guard cell chromatin during stomatal movements. Our cell type specific analyses uncover patterns of chromatin accessibility specific to guard cells and define novel cis-regulatory sequences supporting guard cell specific gene expression. We find that ABA triggers extensive and dynamic chromatin remodeling in guard cells, roots, and mesophyll cells with clear patterns of cell-type specificity. DNA motif analyses uncover binding sites for distinct transcription factors enriched in ABA-induced and ABA-repressed chromatin. We identify the ABF/AREB bZIP-type transcription factors that are required for ABA-triggered chromatin opening in guard cells and implicate the inhibition of a set of bHLH-type transcription factors in controlling ABA-repressed chromatin. Moreover, we demonstrate that ABA and CO2 induce distinct programs of chromatin remodeling. We provide insight into the control of guard cell chromatin dynamics and propose that ABA-induced chromatin remodeling primes the genome for abiotic stress resistance.
2023-12-19 | GSE243470 | GEO
Project description:In plants, epidermal guard cells integrate and respond to numerous environmental signals to control stomatal pore apertures thereby regulating gas exchange. Chromatin structure controls transcription factor access to the genome, but whether large-scale chromatin remodeling occurs in guard cells during stomatal movements, and in response to the hormone abscisic acid (ABA) in general, remain unknown. Here we isolate guard cell nuclei from Arabidopsis thaliana plants to examine whether the physiological signals, ABA and CO2, regulate guard cell chromatin during stomatal movements. Our cell type specific analyses uncover patterns of chromatin accessibility specific to guard cells and define novel cis-regulatory sequences supporting guard cell specific gene expression. We find that ABA triggers extensive and dynamic chromatin remodeling in guard cells, roots, and mesophyll cells with clear patterns of cell-type specificity. DNA motif analyses uncover binding sites for distinct transcription factors enriched in ABA-induced and ABA-repressed chromatin. We identify the ABF/AREB bZIP-type transcription factors that are required for ABA-triggered chromatin opening in guard cells and implicate the inhibition of a set of bHLH-type transcription factors in controlling ABA-repressed chromatin. Moreover, we demonstrate that ABA and CO2 induce distinct programs of chromatin remodeling. We provide insight into the control of guard cell chromatin dynamics and propose that ABA-induced chromatin remodeling primes the genome for abiotic stress resistance.
2023-12-19 | GSE243472 | GEO
Project description:Effect of photoperiod on gene expressions in guard cells.
| PRJNA412628 | ENA
Project description:Stomata are highly specialized organs which consist of pairs of guard cells and regulate gas and water vapor exchange in plants. While early stages of guard cell differentiation have been described and were interpreted in analogy to processes of cell type differentiation in animals, the downstream development of functional stomatal guard cells remains poorly understood. We have isolated an Arabidopsis mutant, scap1 (stomatal carpenter 1), that develops irregularly shaped guard cells and lacks the ability to control stomatal aperture, including CO2-induced stomatal closing and light-induced stomatal opening. SCAP1 was identified as a plant-specific Dof-type transcription factor expressed in maturing guard cells but not in guard mother cells. SCAP1 regulates the expression of genes encoding key elements of stomatal functioning and morphogenesis, such as a K+ channel protein, MYB60 transcription factor, and pectin methyl esterase. Consequently, ion homeostasis was disturbed in scap1 guard cells, and esterification of extracellular pectins was impaired so that the cell walls lining the pores did not mature normally. We conclude that SCAP1 regulates essential processes of stomatal guard cell maturation and functions as a key transcription factor regulating the final stages of guard cell differentiation. We isolated guard cell protoplasts from 4-week-old WT(Col-0) and scap1 mutant plants and extracted RNA independently. Four biological replicates were performed for each experiment.
2013-02-28 | E-GEOD-43964 | biostudies-arrayexpress
Project description:Stomata are highly specialized organs which consist of pairs of guard cells and regulate gas and water vapor exchange in plants. While early stages of guard cell differentiation have been described and were interpreted in analogy to processes of cell type differentiation in animals, the downstream development of functional stomatal guard cells remains poorly understood. We have isolated an Arabidopsis mutant, scap1 (stomatal carpenter 1), that develops irregularly shaped guard cells and lacks the ability to control stomatal aperture, including CO2-induced stomatal closing and light-induced stomatal opening. SCAP1 was identified as a plant-specific Dof-type transcription factor expressed in maturing guard cells but not in guard mother cells. SCAP1 regulates the expression of genes encoding key elements of stomatal functioning and morphogenesis, such as a K+ channel protein, MYB60 transcription factor, and pectin methyl esterase. Consequently, ion homeostasis was disturbed in scap1 guard cells, and esterification of extracellular pectins was impaired so that the cell walls lining the pores did not mature normally. We conclude that SCAP1 regulates essential processes of stomatal guard cell maturation and functions as a key transcription factor regulating the final stages of guard cell differentiation.
2013-02-28 | GSE43964 | GEO
Project description:Flavonols are a class of flavonoids. Unlike other classes of flavonoids, flavonols strongly accumulate in guard cells, but the role of their accumulation in guard cells is still unclear so far.The overexpression of TaFLS1, a flavonol synthase gene from wheat, improves flavonol content in guard cells of Arabidopsis, while the mutant fls1-3 of Arabidopsis AtFLS1 reduces the content. Both the increase of flavonols by TaFLS1 overexpression and the decrease in fls1-3 change stomatal apeture, showing the association between flavonols and stomatal movements. We used microarrays to detail the global programme of gene expression underlying both the increase and decrease of flavonol content and identified possible mechanism of flavonols-mediated stomatal movement. Arabidipsis Col-0, TaFLS1 overexpression lines, and fls1-3 were used for analysis. Leaves of six-week old Arabidopsis seedlings grown in soils under the regime of a 16 h photoperiod at 22°C and 60% relative humidity were sampled, and RNA was extracted for microarray analysis. Each of Arabidopsis lines has three replicates.
2014-02-01 | E-GEOD-54593 | biostudies-arrayexpress
Project description:Systemic Acquired Resistance (SAR) as a plant immune response improves immunity of distal tissue after local exposure to a pathogen. Stomata pores on leaf surfaces are formed by guard cells that recognize bacterial pathogens via pattern recognition receptors. We found that Arabidopsis thaliana plants that have been previously exposed to the pathogenic bacteria Pseudomonas syringae pv. tomato DC3000 (Pst) exhibit an altered stomatal response compared to control plants when systemic leaves are later exposed to the bacteria. Reduced stomatal apertures of SAR primed plants lead to decreases in the number of bacteria that enter the apoplastic space of the leaves. To examine how SAR affects molecular processes in guard cells of distal leaves, we collected Arabidopsis guard cell samples and extracted lipids, metabolites and proteins using a 3-in-1 method. Multi-omic results have revealed molecular components of SAR response specific to the functions of guard cells and roles of ROS and fatty acid signaling in guard cell SAR response. Additionally, our results show an increase in palmitic acid and its derivative 9-PAHSA in primed guard cells. Palmitic acid may play a role as an agonist to Flagellin Sensitive 2 (FLS2), which initiates stomatal closure upon perception of bacterial flagella. The improved understanding of how SAR immune signals affect stomatal movement and immunity can aid biotechnology and marker-based breeding of crops for enhanced disease resistance.
2021-09-09 | PXD022880 | Pride
Project description:Stomatal guard-cells modulate gas exchange between the plant and the atmosphere.<br><br>Regulation of transcription is emerging as an important mechanism in<br><br>controlling guard cells activity. The Arabidopsis transcription factor<br><br>AtMYB60, is specifically expressed in guard cells and controls stomatal<br><br>movements. Opening of stomatal pores is constitutively reduced in the<br><br>atmyb60-1 null allele, and water loss during drought is diminished in<br><br>the mutant compared to wild type. To address the effect of the AtMYB60<br><br>disruption on global gene expression, total mRNAs, derived from<br><br>atmyb60-1 and WT rosette leaves, grown in standard conditions, were hybridized to a cDNA microarray.
2005-01-10 | E-MEXP-225 | biostudies-arrayexpress
Project description:To identify genes of the guard cell transcriptome of Arabidopsis thaliana enriched guard cell samples were compared with total leaf tissue. Genes of the abscisic acid and humidity response of Arabidopsis thaliana guard cells were identified by treatment with ABA-Spray and low humidity.
2013-01-14 | GSE41054 | GEO
Project description:Flavonols are a class of flavonoids. Unlike other classes of flavonoids, flavonols strongly accumulate in guard cells, but the role of their accumulation in guard cells is still unclear so far.The overexpression of TaFLS1, a flavonol synthase gene from wheat, improves flavonol content in guard cells of Arabidopsis, while the mutant fls1-3 of Arabidopsis AtFLS1 reduces the content. Both the increase of flavonols by TaFLS1 overexpression and the decrease in fls1-3 change stomatal apeture, showing the association between flavonols and stomatal movements. We used microarrays to detail the global programme of gene expression underlying both the increase and decrease of flavonol content and identified possible mechanism of flavonols-mediated stomatal movement.
2014-02-01 | GSE54593 | GEO