Expression profile of Arabidopsis thaliana seedlings subjected to hypoxia
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ABSTRACT: Arabidopsis thaliana (Col-0) seedlings were grown on vertically oriented agar plates and subjected to hypoxia (0.2% oxygen, 99.8% nitrogen) for 30 to 240 minutes. Five independent samples were analysed: three samples were subjected to hypoxia treatment and two samples were kept at ambient conditions;
Project description:Arabidopsis thaliana (Col-0) seedlings were grown on vertically oriented agar plates and subjected to hypoxia (0.2% oxygen, 99.8% nitrogen) for 30 to 240 minutes.
Project description:To mimic natural flooding conditions, we have adopted an “open system” treatment, in which only roots are subjected to hypoxia treatment. Using microarray analysis, we identified a number of AP2/ERF genes in Arabidopsis that are induced at different stages of hypoxia treatment. we performed microarray analysis to compare gene expression profiles of wild-type and AtERF73/HRE1-RNAi20 upon normaxic or hypoxic condition, in which AtERF73/HRE1 expression was severely knocked down. Arabidopsis Affymetrix GeneChip arrays were probed with RNAs isolated from roots of untreated plants (controls) and plants treated with hypoxia for 6 h.
Project description:In plants, formation of functional stomatal guard cells is a highly regulated event so that this cell differentiation model constitutes an interesting genetic system to explore cell differentiation in response to cell cycle controllers or cell fate determinants such as transcription factors. The latest acting bHLH in the stomatal lineage circuit is FAMA that appears to be absolutely required to promote stomatal development by controlling the GMC to GC transition. In order for FAMA to trigger guard cell development, it probably initiates a gene activation cascade leading to cell differentiation and cessation of cell division. To identify and characterize FAMA inducible genes, transcriptome analysis using the Affymetrix ATH1 micro-array chip was carried out on inducible FAMA gain of function plants at 4hrs and 48 hrs post-induction. Transgenic plants with an estrogen-inducible FAMA expression cassette were used in a timecourse experiment to identify genes that were differentially regulated by FAMA. Two time points were analyzed, 4 hours and 48 hours post-induction. Seedlings were grown on vertically oriented plates in a 22 °C incubator under 24 hours light for 5 days. Plants were then transfered with forcepts to plates containing MS + Sucrose + 10 µM estrogen (or new MS + sucrose plates for controls). After 4h or 48h on new plates, samples were collected, frozen in liquid nitrogen and stored at â??80 degree until enough material was obtained to do all RNA extractions in the same week. The Rneasy Plant Mini Kit (QIAGEN) for RNA isolation, and samples were labelled with standard kits, etc (get info) and hybridized to Affymetrix Ath1 array chips. 15 samples.
Project description:HRE1 and HRE2 are two ERF transcription factors induced by low oxygen. In this work we analyzed the effect of ectopic expression of HRE1 and HRE2 on the arabidopsis transcriptome in aerobic and hypoxic (1% O2) conditions. While HRE1 has a moderate effect on the expression of anaerobic genes under hypoxia, HRE2 does not affect them either under aerobic or hypoxic conditions. Experiment Overall Design: We treated Arabidopsis seedling Col-0 (wt) and transgenic 35S::HRE1 and 35S::HRE2 , 7-day old, germinated in 12/12 light/dark photoperiod with: Experiment Overall Design: -Control (23°C, dark, 21% O2, 4h). Experiment Overall Design: -Hypoxia (23°C, dark, 1% O2, 4h). Experiment Overall Design: Two biological replicates for each condition.
Project description:Gene expression profiles among avascular region (around ventricular zone), highly vascularized region with honeycomb-patterned vascular plexus (around subventricular zone and intermediate zone), and cortical plate with vertically oriented vessels from laser-captured microdissected E14.5 neocortex were compared by microarray
Project description:Flooded plants experience impaired gas diffusion underwater, leading to oxygen deprivation (hypoxia) stress. The volatile plant hormone ethylene is rapidly trapped in submerged plant cells and is instrumental for enhanced metabolic hypoxia acclimation. However, the precise mechanisms underpinning ethylene-enhanced hypoxia survival remain unclear. We studied the effect of ethylene pre-treatment on hypoxia survival of primary Arabidopsis thaliana root tips.
Project description:The effect of the overexpression of Plant Cysteine Oxidase (PDCO1) on the transcriptome of Arabidopsis resettes was investigated with plants subjected to a 4h hypoxia (5% O2 v/v in air). For this purpose, 4-week old rosette of wild-type and 35S:FLAG:CDO1 plants were compared. Samples were composed of pools of 5 plants. In total, 6 samples were analyzes, subdivided in 2 thesis with 3 replicates each. 35S:PCO1 plants (treated with hypoxia) were compared to wild-type plants (treated with hypoxia).
Project description:A study to evaluate techniques for repairing DNA from formalin-fixed paraffin-embedded (FFPE) tissue samples by direct comparison of FFPE DNA repair methods prior to analysis on genome-wide methylation array to matched fresh frozen (FF) tissues. Formalin-fixed paraffin-embedded tissue from three colon adenocarcinoma samples were subjected to different FFPE-oriented DNA repair approaches and sequences, then compared with corresponding fresh frozen tissues. All samples were hybridized to the Illumina Infinium 450k Human Methylation BeadChip.
Project description:10-12 day old liquid MS grown Arabidopsis seedlings were either treated with JA-Ile or control for 30 min. Three biological replicates of treated and control were then subjected to RNA isolation and a gene expression analysis was done.
Project description:Arabidopsis thaliana wild-type and ire1a/ire1b double mutant plants were treated with tunicamycin. RNA was extracted and subjected to microarray analysis.