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Atmyc2_cop1_mutant_light_ABA_treatment

ABSTRACT: Although many regulatory components of light signaling have been functionally characterized, only a few of them have been reported to cross talk with other signaling cascades. In this study, we have analyzed the expression profiles of Arabidopsis genes in wild-type, atmyc2 mutant, cop1-6 mutant, and atmyc2 cop1-6 double mutant seedlings grown under constant dark, constant blue-light, and constant blue-light along with abscisic acid (ABA) to illustrate the interplay of negative regulators, AtMYC2 and COP1, in light and ABA signaling Keywords: Light and abscisic acid treatment

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE8955 | GEO | 2009/12/31

SECONDARY ACCESSION(S): PRJNA102391

REPOSITORIES: GEO

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atmyc2_cop1_mutant_light_ABA_treatment

Project description:Although many regulatory components of light signaling have been functionally characterized, only a few of them have been reported to cross talk with other signaling cascades. In this study, we have analyzed the expression profiles of Arabidopsis genes in wild-type, atmyc2 mutant, cop1-6 mutant, and atmyc2 cop1-6 double mutant seedlings grown under constant dark, constant blue-light, and constant blue-light along with abscisic acid (ABA) to illustrate the interplay of negative regulators, AtMYC2 and COP1, in light and ABA signaling Keywords: Light and abscisic acid treatment Expression data for wild-type, atmyc2, cop1-6, and atmyc2 cop1-6 seedlings under constant dark, blue-light and blue-light along with abscisic acid Ten-day-old Arabidopsis (wild-type, atmyc2 mutant, cop1-6 mutant, and atmyc2 cop1-6 double mutant) seedlings grown under constant dark, constant blue-light (35 µmol/sec/m2), and constant blue-light along with ABA (0.5 µm) were used for RNA extraction and hybridization on Affymetrix microarrays. Two biological replicates of each sample were used for microarray analysis.

2009-12-31 | E-GEOD-8955 | biostudies-arrayexpress

Transcriptome analysis of Arabidopsis thaliana G protein subunit mutants in response to abscisic acid (ABA)

Project description:Heterotrimeric G proteins mediate crucial and diverse signaling pathways in eukaryotes. To gain insights into the regulatory modes of the G protein and the co-regulatory modes of the G protein and the stress hormone abscisic acid (ABA), we generated and analyzed gene expression in G protein subunit single and double mutants of the model plant Arabidopsis thaliana. Through a Boolean modeling approach, our analysis reveals novel modes of heterotrimeric G protein action. Keywords: transcriptome analysis; G protein subunit mutants; abscisic acid (ABA) Microarray data were generated from four genotypes (wild type, gpa1-4 mutant, agb1-2 mutant, agb1-2 gpa1-4 double mutant) with or without ABA treatment. Arabidopsis plants were grown in growth chambers with an 8 hr light/16hr dark. Three hundred Arabidopsis leaves excised from 60-70 five-week-old plants were used as the starting material for each guard cell microarray. Ten mature leaves taken from 3-4 plants grown side-by side with the plants for guard cell isolation were used for each leaf sample. Excised leaf and isolated guard cell samples were treated with ABA (50 μM) or EtOH (solvent control) for 3 hrs. For each type of sample (guard cells or leaves), three independent biological replicates were performed, resulting in a total of 48 microarray hybridizations (2 sample types ´ 4 genotypes ´ two treatments ´3 replicates).

2010-12-06 | E-GEOD-19520 | biostudies-arrayexpress

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Project description:To understand the Abscisic Acid (ABA) signaling in response to dehydration stress, we performed analysis of gene expression using Arabidopsis wild-type plants and the nced3-2 mutant under dehydration stress. The nced3-2 mutant is an Arabidopsis T-DNA tagged knock-out mutant of the NCED3 gene, which has an essential role in dehydration-inducible ABA biosynthesis. Arabidopsis plants were grown in in soil (verdenite 40 mmÎ¦, Verde Co., Ltd., Kanagawa, Japan) in a cell strainer (Falcon, 40 Î¼m; Corning Inc., NY, USA). Plants were grown at 22Â°C for 3 weeks under illumination (40â60 Î¼mol m-2s-1; 16 h light/8 h darkness). Three-week-old plants were exposed to dehydration stress by being denied water for 6, 24, 48, or 72 h.

2017-04-07 | E-MTAB-4640 | biostudies-arrayexpress

Expression data from stratified mads-box (agl67) mutant and wild-type seeds, ABA-treated

Project description:The mads-box mutant line showed an abscisic acid (ABA)-insensitive phenotype. The AGAMOUS-LIKE 67 (AT1G77950) gene encodes a transcription factor that is nuclear-localized, as observed by transiently transformed epidermal onion cells, specifically expressed in seeds and involved in an ABA signaling pathway during seed germination (Fernández-Arbaizar et al. 2012). SALK_050367 seeds were obtained from the Arabidopsis Biological Resource Center, ABRC.

2019-12-31 | GSE25451 | GEO

bHLH transcription factors facilitating K+ uptake during stomatal opening are repressed by abscisic acid through phosphorylation

Project description:Stomata open in response to light and close following exposure to abscisic acid (ABA). They regulate gas exchange between plants and atmosphere, allowing plants to adapt to changing environmental conditions. ABA binding to receptors initiates a signaling cascade that involves protein phosphorylation. Here we show that ABA induced phosphorylation of three basic helix-loop-helix (bHLH) transcription factors, called AKSs (ABA-RESPONSIVE KINASE SUBSTRATES; AKS1, AKS2, AKS3), in Arabidopsis guard cells, and that they facilitated stomatal opening through the transcription of genes encoding inwardly-rectifying K+ channels. aks1aks2-1 double mutant plants showed decreases in light-induced stomatal opening, K+ accumulation in response to light, activity of inwardly-rectifying K+ channels, and transcription of genes encoding major inwardly-rectifying K+ channels. Overexpression of POTASSIUM CHANNEL IN ARABIDOPSIS THALIANA 1 (KAT1), which encodes a major inwardly-rectifying K+ channel in guard cells, rescued the phenotype of aks1aks2-1 plants. AKS1 bound directly to the promoter of KAT1, an interaction that was attenuated after ABA-induced phosphorylation. The ABA agonist pyrabactin induced phosphorylation of AKSs. Our results demonstrate that the AKS family of bHLH transcription factors facilitates stomatal opening through transcription of genes encoding inwardly-rectifying K+ channels, and that ABA suppresses the activity of inwardly-rectifying K+ channel activity by triggering the phosphorylation of these transcription factors. To find the affect of AKS1 and AKS2 transcription factors on gene expression, Arabidopsis guard cell protoplasts from wild type and aks1aks2-1 mutant were compared. Three independent experiments were performed.

2013-06-17 | E-GEOD-46574 | biostudies-arrayexpress

Abscisic acid effect on wild type and the abh1 mutant

Project description:Analysis of the abh1 mutant Arabidopsis plants following treatment with 50 uM abscisic acid (ABA). ABH1 encodes the large (80kDa) subunit of the nuclear mRNA cap binding complex and affects early ABA signal transduction events (Hugouvieux et al., 2001, Cell 106, 477). Keywords: stress response

2007-03-01 | GSE7112 | GEO

abaseed-ABA signaling in Arabidopsis seeds

Project description:ra14-04_nced - abaseed - Identification of abscisic acid (ABA) signaling factors and targets in Arabidopsis developing seeds by comparing ABA deficient and wild type genotypes. Transcriptome comparison of developing seeds harvested at 14 DAP from two ABA-deficient mutants (nced2 nced5 nced9 and nced2 nced5 nced6 nced9) and wild type (Columbia-0).

2015-07-01 | GSE68088 | GEO

bHLH transcription factors facilitating K+ uptake during stomatal opening are repressed by abscisic acid through phosphorylation

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UBP12 and UBP13 deubiquitinases destabilize the CRY2 blue light receptor to regulate Arabidopsis growth

Project description:Light is a crucial exogenous signal sensed by cryptochrome (CRY) blue light receptors to modulate growth and the circadian clock in plants and animals. However, how CRYs interpret light quantity to regulate growth in plants remains poorly understood. Furthermore, CRY2 protein levels and activity are tightly regulated in light to fine-tune hypocotyl growth; however, details of the mechanisms that explain precise control of CRY2 levels are not fully understood. We show that in Arabidopsis, UBP12 and UBP13 deubiquitinases physically interact with CRY2 in light. UBP12/13 negatively regulates CRY2 by promoting its ubiquitination and turnover to modulate hypocotyl growth. Growth and development were explicitly affected in blue light when UBP12/13 were disrupted or overexpressed, indicating their role alongside CRY2. UBP12/13 also interacted with and stabilized COP1, which is partially required for CRY2 turnover. Our combined genetic and molecular data support a mechanistic model in which UBP12/13 interact with CRY2 and COP1, leading to the stabilization of COP1. Stabilized COP1 then promotes the ubiquitination and degradation of CRY2 under blue light. Despite decades of studies on deubiquitinases, the knowledge of how their activity is regulated is limited. Our study provides insight into how exogenous signals and ligands, along with their receptors, regulate deubiquitinase activity by protein-protein interaction. Collectively, our results provide a framework of cryptochromes and deubiquitinases to detect and interpret light signals to control plant growth at the most appropriate time.

2022-06-13 | GSE201685 | GEO

dgpp-2 DGPP-regulated genes: Identification of diacylglycerol pyrophosphate-regulated genes in ABA signaling

Project description:rs05-06_dgpp - dgpp - 2. The specific plant phosphorylated form of phosphatidic acid (PA), diacyglycerol pyrophosphate (DGPP), was recently shown to be a second messenger in abscisic acid (ABA) signaling. The aim of the project is to identify among the set of ABA-regulated genes the ones also regulated by DGPP and/or PA.

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