Hr-Transcriptomic analysis of the localized acquired resistance (LAR) phenomenon in Arabidopsis thaliana
ABSTRACT: tri38-lar - hr - Analyse the transcriptome of Arabidopsis thaliana plants developing localized acquired resistance (LAR) and a hypersensitive response (HR). The goal is to identify genes inducing LAR and/or HR. Here, we want to analyse the transcriptome of Arabidopsis thaliana developing HR. To achieve this, we used Col0 leaf tissues developing an HR reaction after inoculation of the avirulent strain of PstDC3000 carrying the gene avrRpm1. Keywords: normal vs disease comparison Overall design: 1 dye-swap - CATMA arrays
Project description:tri38-lar - hr - Analyse the transcriptome of Arabidopsis thaliana plants developing localized acquired resistance (LAR) and a hypersensitive response (HR). The goal is to identify genes inducing LAR and/or HR. Here, we want to analyse the transcriptome of Arabidopsis thaliana developing HR. To achieve this, we used Col0 leaf tissues developing an HR reaction after inoculation of the avirulent strain of PstDC3000 carrying the gene avrRpm1. Keywords: normal vs disease comparison 1 dye-swap - CATMA arrays
Project description:tri38-lar - lar - Analyse the transcriptome of Arabidopsis thaliana plants developing localized acquired resistance (LAR) and a hypersensitive response (HR). The goal is to identify genes inducing LAR and/or HR. Plants were treated either with PstDC3000 (avrRpm1)or MgCl2 (control plants). The samples were studied at 3 points of the infection kinetics of the LAR phenomenon: 6h, 24h and 48h. Keywords: normal vs disease comparison 3 dye-swaps - CATMA arrays 12 biological repetitions were pooled for this experiment.
Project description:tri38-lar - lar - Analyse the transcriptome of Arabidopsis thaliana plants developing localized acquired resistance (LAR) and a hypersensitive response (HR). The goal is to identify genes inducing LAR and/or HR. Plants were treated either with PstDC3000 (avrRpm1)or MgCl2 (control plants). The samples were studied at 3 points of the infection kinetics of the LAR phenomenon: 6h, 24h and 48h. Keywords: normal vs disease comparison Overall design: 3 dye-swaps - CATMA arrays 12 biological repetitions were pooled for this experiment.
Project description:Pathogen invasion in plants is associated with transcriptional reprogramming. Enigmatically, plants induce similar transcriptome responses upon infection by virulent or avirulent pathogens. This renders the importance of transcriptional reprogramming for immunity obscure. Here, using RNA-seq, we generate time-series transcriptome data coupled with genetic perturbations to reveal temporal dynamics upon infection by virulent or avirulent strains of a bacterial pathogen, Pseudomonas syringae, in Arabidopsis thaliana. Fast and sustained transcriptional reprogramming occurs upon infection with avirulent strains while virulent strain infection leads to a slower response with comparable gene expression patterns and magnitudes. Importantly, transcriptome analysis of resistant and susceptible mutants responding to avirulent strains links delayed transcriptional reprogramming to compromised immunity. Taken together, our results pinpoint the early critical time window of transcriptional reprogramming for establishing effective immunity against the bacterial pathogen. Overall design: Leaves of Col-0 and all the single, double, triple and quadruple mutants of dde2-2, ein2-1, pad4-1, sid2-2 were syringe-infiltrated with mock (water) or suspensions of Pseudomonas syringae pv. tomato DC3000 (Pto DC3000) carrying an empty vector (pLAFR), Pto DC3000 carrying AvrRpt2, or Pto DC3000 carrying AvrRpm1 at the OD600 of 0.001. Similarly, leaves of the rpm1-3 rps2-101C mutant plants were inoculated with mock, Pto DC3000 carrying AvrRpt2 or Pto DC3000 carrying AvrRpm1. Three fully-expanded leaves (leaves 7-9) from three different plants were harvested as a single biological replicate at 1, 2, 3, 4, 6, 9, 12, 16, 20, 24, 36, 48 hours post inoculation (hpi). To generate three biological replicates, three independent experimental trials were carried out, in which plant positions within pots and growth chambers were randomized in order to avoid undesirable systematic effects. For the statistcal analysis, 348 samples (M001-M348) were used.
Project description:Innate immune responses of plant cells confer the first line of defence against pathogens. Signals generated by activated receptors are integrated inside the cell and converge on transcriptional programmes in the nucleus. In Arabidopsis, the CAMTA family of transcription factors plays a pivotal function in immunity. CAMTA binding motifs are highly enriched in the genes quickly induced during ETI and PTI. Using RNA-seq, we investigated the role of CAMTA TFs during the early ETI and PTI transcriptional responses. Overall design: We compared the expression changes between an Arabidopsis mutant line carrying the camta3-D (sr1-4d) dominant negative mutation and Col-0 wild-type plants following treatment with the PAMP flg22 (100 nM), and the avirulent bacterial strains Pst DC3000 AvrRpm1 (OD600=0.001) and Pst DC3000 AvrRps4 (OD600=0.001). The expression changes were analysed at one time point after each treatment (1 hour for flg22 and 4 hours for Pst DC3000 AvrRpm1 and Pst DC3000 AvrRps4 treatments).
Project description:Compare gene expression in the resting leaves of Arabidopsis thaliana WT with the mutants fou2 and tpc1-2. To analyse the contribution of the fou2 and tpc1-2 mutations in Arabidopsis thaliana to gene expression, transcript levels in the resting leaves of Arabidopsis were measured using 4 weeks-old plants grown in control conditions (long day).
Project description:With frequent fluctuations in global climate, plants often experience co-occurring dry-wet cycles and pathogen infection and this combination adversely affects plant survival. In the past, some studies indicated that morpho-physiological responses of plants to the combined stress are different from the individual stressed plants. However, interaction of drought stressed or drought recovered plants with pathogen has not been widely studied at molecular level. Such studies are important to understand the defense pathways that operate as part of combined stress tolerance mechanism. In this study, Arabidopsis plants were exposed to individual drought stress (soil drying at 40% FC, D), Pseudomonas syringae pv tomato DC3000 (PStDC3000), infection and their combination. Plants recovered from drought stress were also exposed to PStDC3000. Beside we have also infiltrated P. syringae pv tabaci (PSta, non-host pathogen) individually or in combination with drought stress. Using Affymetrix WT gene 1.0 ST array, global transcriptome profiling of plants leaves under individual drought stress and pathogen infection was compared with their combination. Results implicate that plants exposed to combined drought and pathogen stress experience a new state of stress where each combination of stressor and their timing defines the plant responses and thus should be studied explicitly. Global transcriptional analysis in Arabidopsis leaves exposed to individual and combined drought and pathogen stress. Overall design: Microarray based global gene expression analysis was carried out in Arabidopsis leaves after exposure to individual and combined stress treatments. Arabidopsis plants were exposed to drought stress (D), PStDC3000 infection (P, 1d and 6d), PSta infection (NH, 1d). For treatments involving combined stress, PStDC3000 was infiltrated on drought stressed plants (DP, 1d), plants were exposed to drought stress upon PStDC3000 infiltration (PD, 1d), PSta was infiltrated on drought stressed plants (DNH, 1d), and PStDC3000 was infiltrated on drought recovered plants (DRP). Six plants per treatment were used such that leaf tissue from three plants made one biological replicate. Two biological replicates were hybridized for each treatment.
Project description:The present work is directed at studying changes at the proteome level in Arabidopsis thaliana leaves in response to Pseudomonas syringae virulent (Pst) and avirulent (Pst avrRpt2) strains. Arabidopsis leaves were sampled from challenged plants at 4, 8 and 24 hours post inoculation. Proteins were TCA-acetone-phenol extracted and subjected to 2-DE (5-8 pH range) and MS/MS (MALDI-TOF-TOF) analysis. Out of 800 matched spots on each of the 36 gels analysed, 147 spots were either absent in at least one of the conditions studied (time or treatments; qualitative variable spots) or differentially accumulated between time and treatments (quantitative variable spots). Out of the 24 proteins successfully identified over TAIR10 database, 23 have not been reported previously in similar proteomics studies of the Arabidopsis thaliana-Pseudomonas syringae interaction. The exhaustive statistical analysis performed, including principal component and heat map, showed that 24 hours post inoculation can clearly discriminate the challenged plants from the control. The protein change occurred early (4 hours post inoculation) following the virulent pathogen infection, whereas the change occurred later (24 hours post inoculation) following the avirulent pathogen inoculation. Concerning the variable proteins, three behavioural groups can be observed: group 1 (common protein changes in response to virulent and avirulent pathogen infection), group 2 (protein changes in response to virulent pathogen infection) and group 3 (protein changes in response to avirulent pathogen infection). Differential identified proteins following the pathogen infection belonged to different groups including those of oxidative stress defence, enzymes of metabolic pathways and molecular chaperones.
Project description:In order to identify differentially expressed genes in developing seeds of Arabidopsis thaliana three different stages of seed development were analysed (9-10, 10-11 and 12-13 days after flower opening) for two Arabidopsis thaliana accessions, Col-0 and C24. For each stage and accession three biological replicates were analysed. Overall design: Expression data for the two accessions were compared for developing seeds of the same stage. For each of the accessions gene expression at the different developmental stages was also compared.
Project description:1- Comparison of the transcriptome of two ecotypes (Col0 and Ler0): compare the transcriptome of ColO versus Ler0 for different tissues and developmental stages (seedlings 7 days, shoot 14 days, flowers, leafs 35 days)<br> 2- Impact of SINE RNA : Analyse the consequence of the expression of a SINE RNA in Arabidopsis thaliana<br> 3- Impact of the gcn2 mutation : Impact of the gcn2 mutation on the Arabidopsis thaliana transcriptome. GCN2 is a kinase potentially regulated by the SINE non-coding RNA