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CBP60g and CBP60h play partially redundant and critical roles in salicylic acid signaling

ABSTRACT: Our previous study on CBP60g, a calmodulin binding protein that is important for disease resistance and microbe-associated molecular pattern (MAMP)-induced SA accumulation, led to our discovery of a closely related family member CBP60h. CBP60h is also important for defense against P. syringae but is induced differently by pathogen and MAMP stimulus. Transcriptome profiling of cbp60h mutants suggested that CBP60h might be primarily functioning in response against P. syringae. We constructed a double mutant of cbp60g and cbp60h, which demonstrated severely defective defense against P. syringae and SA accumulation. Profiling of the cbp60g/h showed that its expression pattern is very similar to that of pad4. Transient expression in Tobacco showed that both CBP60g and CBP60h localized to nucleus. Our observation suggest that CBP60g and CBP60h share partially redundant but critical role in defense response and SA signaling.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE18865 | GEO | 2009/11/04

SECONDARY ACCESSION(S): PRJNA121117

REPOSITORIES: GEO

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CBP60g and CBP60h play partially redundant and critical roles in salicylic acid signaling

Project description:Our previous study on CBP60g, a calmodulin binding protein that is important for disease resistance and microbe-associated molecular pattern (MAMP)-induced SA accumulation, led to our discovery of a closely related family member CBP60h. CBP60h is also important for defense against P. syringae but is induced differently by pathogen and MAMP stimulus. Transcriptome profiling of cbp60h mutants suggested that CBP60h might be primarily functioning in response against P. syringae. We constructed a double mutant of cbp60g and cbp60h, which demonstrated severely defective defense against P. syringae and SA accumulation. Profiling of the cbp60g/h showed that its expression pattern is very similar to that of pad4. Transient expression in Tobacco showed that both CBP60g and CBP60h localized to nucleus. Our observation suggest that CBP60g and CBP60h share partially redundant but critical role in defense response and SA signaling. This experiment consists of three biological replicates. For each genotype, two leaves per plant were pooled from three pots to prepare total RNA.

2009-11-03 | E-GEOD-18865 | biostudies-arrayexpress

Arabidopsis CBP60g Contributes to MAMP-Induced SA Accumulation and Is Involved in Disease Resistance

Project description:Salicylic acid (SA)-induced defense responses are important factors during effector triggered immunity and microbe-associated molecular pattern (MAMP)-induced immunity in plants. This article presents evidence that a member of the Arabidopsis CBP60 gene family, CBP60g, contributes to MAMP-triggered SA accumulation. CBP60g is inducible by both pathogen and MAMP treatments. Pseudomonas syringae growth is enhanced in cbp60g mutants. Expression profiles of a cbp60g mutant after MAMP treatment are similar to those of sid2 and pad4, suggesting a defect in SA signaling. Accordingly, cbp60g mutants accumulate less SA when treated with the MAMP flg22 or a P. syringae hrcC strain that activates MAMP signaling. MAMP-induced production of reactive oxygen species and callose deposition are unaffected in cbp60g mutants. CBP60g is a calmodulin-binding protein with a calmodulin-binding domain located near the N-terminus. Calmodulin binding is dependent on Ca2+. Mutations in CBP60g that abolish calmodulin binding prevent complementation of the SA production and bacterial growth defects of cbp60g mutants, indicating that calmodulin binding is essential for the function of CBP60g in defense signaling. These studies show that CBP60g constitutes a calmodulin-dependent link between MAMP recognition and SA accumulation that is important for resistance to P. syringae. This experiment consists of three biological replicates. For each genotype, two leaves per plant were pooled from three pots to prepare total RNA.

2010-05-07 | E-GEOD-14237 | biostudies-arrayexpress

Arabidopsis CBP60g Contributes to MAMP-Induced SA Accumulation and Is Involved in Disease Resistance

2009-01-15 | GSE14237 | GEO

Salicylic acid accumulation is required for Fe-deficiency responses in Arabidopsis

Project description:Several phytohormones and other small molecules have been demonstrated to be involved in iron (Fe) homeostasis. However, how salicylic acid (SA), an essential hormone in plant immunity and defense responses, participates in Fe-deficiency responses in plants is largely unknown. Here, we took advantage of a SA biosynthesis defect mutant phytoalexin deficient 4 (pad4: T-DNA Salk_089936) to explore the possible effects of endogenous SA on the morphological and physiological responses to Fe deprivation. Under a Fe-deficiency treatment, Col-0 showed more severe leaf chlorosis and root growth inhibition compared with the pad4 mutant. The soluble Fe concentrations were significant higher in pad4 than Col-0 under the Fe-deficiency treatment, suggesting that a mutation in the PAD4 gene may alleviate the Fe-deficiency-induced symptoms by regulating the soluble Fe concentrations. Furthermore, a SA signaling maker line (PR1promoter: GUS) was used to investigate how Fe deficiency affects endogenous SA biosynthesis and metabolism. The data showed that Fe deficiency significantly induced SA accumulation in Col-0, and the loss function of PAD4 blocked this process. The requirement of endogenous SA accumulation for Fe-deficiency responses was confirmed using a series of SA biosynthetic mutants and transgenic lines.

2016-10-01 | GSE74515 | GEO

Enhanced Salicylic Acid Biosynthesis Is Involved in Heterosis for Bacterial Defense in Arabidopsis

Project description:We provide evidence that heterosis for bacterial defense exists in hybrids crossed between some Arabidopsis accessions. Comparison of transcriptomes between hybrids exhibiting heterosis for disease resistance and their parents after inoculation with Pst DC3000 revealed that several key genes involved in salicylic acid (SA) biosynthesis were significantly up-regulated in hybrids. Consistently, in response to bacterial infection, more SA [both free SA and SA glycoside (SAG)] accumulated in hybrids compared with both parents. In addition, heterosis for bacterial defense was significantly compromised in hybrids of pad4 mutants in which the SA biosynthesis pathway was blocked. Moreover, we further revealed that increased histone H3 acetylation of the key genes involved in the SA biosynthesis pathway correlated with their up-regulated expression in hybrids.

2015-06-02 | GSE62256 | GEO

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

2007-07-14 | GSE8273 | GEO

Enhanced Salicylic Acid Biosynthesis Is Involved in Heterosis for Bacterial Defense in Arabidopsis

2015-06-02 | E-GEOD-62256 | biostudies-arrayexpress

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

Salicylic acid inhibits transcriptional repression activities of its receptors to promote defense gene expression

Project description:Salicylic acid (SA) is a plant defense hormone required for immunity. Arabidopsis NPR1 and NPR3/NPR4 were previously shown to bind SA and proposed as SA receptors. However, unlike NPR1, loss of NPR3/NPR4 does not block SA-induced defense gene expression. Here we report that NPR3/NPR4 function as transcriptional repressors and SA inhibits their activities to promote the expression of key immune regulators. npr4-4D, a newly identified gain-of-function allele that renders NPR4 unable to bind SA, constitutively represses SA-induced immune responses. In contrast, the equivalent mutation in NPR1 abolishes its function in promoting SA-induced defense gene expression. Further analysis revealed that npr4-4D and npr1-1 have additive effect on blocking SA-induced defense gene expression, suggesting that NPR4 and NPR1 function in parallel to regulate SA-induced immune responses. Our study reveals the molecular functions of SA receptors NPR3/NPR4 and uncovers a brand new mechanism of SA perception.

2018-06-08 | GSE110702 | GEO

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

2008-07-18 | GSE11009 | GEO

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