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The Genetic Network Controlling the Arabidopsis Transcriptional Response to Pseudomonas syringae pv. maculicola

ABSTRACT: Expression profiling of wild-type plants and mutants with defects in key components of the defense signaling network was used to model the Arabidopsis network 24 hours after infection by Pseudomonas syringae pv. maculicola strain Psm ES4326. Results using the Affymetrix ATH1 array revealed that expression levels of most pathogen-responsive genes were affected by mutations in coi1, ein2, npr1, pad4, or sid2. These five mutations defined a small number of different expression patterns displayed by the majority of pathogen-responsive genes. P. syringae pv. tomato strain Pst DC3000 elicited a much weaker salicylic acid response than Psm ES4326. Additional mutants were profiled using a custom array. Profiles of pbs3 and ndr1 revealed major effects of these mutations and allowed PBS3 and NDR1 to be placed between the EDS1/PAD4 node and the SA synthesis node in the defense network. Comparison of coi1, dde2, and jar1 profiles showed that many genes were affected by coi1, but very few were affected by dde2 or jar1. Profiles of coi1 plants infected with Psm ES4326 were very similar to those of wild-type plants infected with bacteria unable to produce the phytotoxin coronatine, indicating that essentially all COI1-dependent gene expression changes in this system are caused by coronatine.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE11009 | GEO | 2008/07/18

SECONDARY ACCESSION(S): PRJNA107093

REPOSITORIES: GEO

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The Genetic Network Controlling the Arabidopsis Transcriptional Response to Pseudomonas syringae pv. maculicola

Project description:Expression profiling of wild-type plants and mutants with defects in key components of the defense signaling network was used to model the Arabidopsis network 24 hours after infection by Pseudomonas syringae pv. maculicola strain Psm ES4326. Results using the Affymetrix ATH1 array revealed that expression levels of most pathogen-responsive genes were affected by mutations in coi1, ein2, npr1, pad4, or sid2. These five mutations defined a small number of different expression patterns displayed by the majority of pathogen-responsive genes. P. syringae pv. tomato strain Pst DC3000 elicited a much weaker salicylic acid response than Psm ES4326. Additional mutants were profiled using a custom array. Profiles of pbs3 and ndr1 revealed major effects of these mutations and allowed PBS3 and NDR1 to be placed between the EDS1/PAD4 node and the SA synthesis node in the defense network. Comparison of coi1, dde2, and jar1 profiles showed that many genes were affected by coi1, but very few were affected by dde2 or jar1. Profiles of coi1 plants infected with Psm ES4326 were very similar to those of wild-type plants infected with bacteria unable to produce the phytotoxin coronatine, indicating that essentially all COI1-dependent gene expression changes in this system are caused by coronatine. This experiment consists of three biological replicates. For each genotype, two leaves per plant were pooled from three pots to prepare total RNA.

2008-07-18 | E-GEOD-11009 | biostudies-arrayexpress

Novel JAZ co-operativity and unexpected JA dynamics underpin Arabidopsis defence responses to Pseudomonas syringae infection

Project description:Pathogens target phytohormone signalling pathways to promote disease. Plants deploy salicylic acid (SA) mediated defences against biotrophs. Pathogens antagonise SA immunity by activating jasmonate signalling, e.g. Pseudomonas syringae pv. tomato DC3000 produces coronatine (COR), a jasmonate (JA) mimic. This study found unexpected dynamics between SA, JA and COR and co-operation between JAZ jasmonate repressor proteins during DC3000 infection. JA did not accumulate until late in the infection process and was higher in leaves challenged with coronatine deficient P. syringae or in the more resistant JA receptor mutant coi1. JAZ regulation was complex and coronatine alone was insufficient to sustainably induce JAZs. RNA was extracted from leaves of wild type Col-0 or the jaz5/10 mutant plants from leaves 6, 8, 12 or 16 hours after challenged with Pseudomonas syringae pv. tomato DC3000.

2015-08-28 | E-GEOD-72461 | biostudies-arrayexpress

Novel JAZ co-operativity and unexpected JA dynamics underpin Arabidopsis defence responses to Pseudomonas syringae infection

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Microarray analysis of Psm-induced transcriptome changes in the systemic leaves of Arabidopsis plants

Project description:The goal of the microarray was to compare the bacterial pathogen Pseudomonas syringae pv. maculicola ES4326 (Psm)-induced transcriptome changes in the systemic leaves of the wild-type Col-0, lecrk-VI.2-2, and bak1-5 plants. Results showed that local Psm inoculation induced dramatic transcriptional changes in Col-0, with 564 and 151 genes up- and down-regulated at least twofold with a low q value (≤ 0.05), respectively. However, only 55 and 26 genes in lecrk-VI.2-2 and 221 and 121 genes in bak1-5 were up- and down-regulated, respectively. The majority of the genes that were induced or suppressed twofold or more with a low q value (≤ 0.05) in Col-0 were induced or suppressed to a smaller extent in bak1-5 and the smallest extent in lecrk-VI.2-2. These results indicate that both lecrk-VI.2-2 and bak1-5 suppressed Psm-induced systemic signaling with the lecrk-VI.2-2 mutation having a stronger effect than bak1-5.

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KA120 negatively regulates effector-triggered immunity [RNA-seq]

Project description:Purpose: To understand the autoimmune phenotype in the ka120 mutant and the suppression of ka120 phenotype by the pad4 and ndr1 mutant, we performed the whole genome transcriptome analysis on three-week-old Arabidopsis WT, ka120, ka120 pad4, and ka120 ndr1 plants (the entire rosette was sampled).

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Project description:The phytohormone (+)-7-iso-jasmonoyl-L-isoleucine (JA-Ile) is a major regulator of developmental and stress responses in plants. The perception of JA-Ile involves the formation of a ternary complex with the F-box protein COI1 and a member of the JAZ family of co-repressors, which leads to JAZ degradation. Coronatine (COR) is a bacterial phytotoxin that functionally mimics JA-Ile and interacts with the co-receptor COI1-JAZ complex with higher affinity than JA-Ile. Based on the crystal structure of the co-receptor, we designed ligand derivatives that spatially impede the interaction of the co-receptor proteins and, therefore, should act as competitive antagonists of COR or JA-Ile. One derivative, Coronatine O-methyloxime (COR-MO), shows a strong activity preventing COI-JAZ interaction and the subsequent JAZ degradation. COR-MO efficiently reverts the effects of JA-Ile or COR treatments on JA-mediated responses, such as anthocyanin accumulation, root-growth inhibition and gene expression in Arabidopsis plants. Moreover, it potentiates plant resistance preventing the effect of bacterially produced COR during Pseudomonas syringae infections in different plant species. In addition to the utility of COR-MO for Plant Biology research, our results underscore its biotechnological and agronomical potential for a safer and sustainable agriculture. Two-condition experiment, Col-0 vs Col-0 plants treated 2h with Coronatine 0-methyloxime (COR-MO) and Col-0 plants treated 2h with Coronatine vs Col-0 plants treated 2h with Coronatine plus COR-MO. Biological replicates: 4 control and 4 treated replicates

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Interplay between MAMPs-triggered and SA-mediated defense responses

Project description:The Arabidopsis Pathoarray 464_001 (GPL3638) was used to compare response of Col-0, pad4-1 (Zhou et al., 1998; Jirage et al., 1999) and sid2-2 (Wildermuth et al., 2001) to Pseudomonas syringae pv. tomato DC3000 hrcC mutant. SA production is drastically reduced in sid2 mutants. PAD4 is required for SA-mediated responses. The results suggested that the SA increase triggered by MAMPs is one major component in the MAMPs-triggered signaling mechanism. Keywords: Responses of Arabidopsis to Pseudomonas syringae pv. tomato DC3000 hrcC mutant

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An Ancient COI1-independent Function for Reactive Electrophilic Oxylipins in Thermotolerance [array]

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Evaluation of performance of Arabidopsis Pathoarray 464_001: comparison with ATH1

Project description:To evaluate technical reproducibility of Arabidopsis Pathoarray 464_001 (GPL3638), two slides were hybridized with labeled amplified RNA prepared from identical RNA. The RNA was prepared from Pseudomonas syringae ES4326- and 5mM MgSO4- injected samples (Psm 24h set C and mock 24h set C. See also GSE4429, GSM99793 and GSM99794). Keywords: Evaluation of a custom microarray performance

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Gene expression changes of Pseudomonas syringae pv. actinidiae biovar 6 in various culture conditions

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