Responses to hydric stress in the seed-borne necrotrophic fungus Alternaria brassicicola
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ABSTRACT:
PROVIDER: PRJNA551655 | ENA |
REPOSITORIES: ENA
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Project description:We analyzed dual-transcriptome changes in germinating Arabidopsis seeds at three development stages (3, 6 and 10 days after sowing) with or without Alternaria brassicicola. Differentailly expressed genes were identified from both seed and fungus.
2022-04-12 | GSE199977 | GEO
Project description:Plant microRNAs (miRNAs) have been implicated in plant immunity. These mainly focusing Arabidopsis thaliana threatened by (hemi-)biotrophic pathogens such as the bacterial pathogen Pseudomonas syringae. Here, we show that the Arabidopsis miRNA pathway is important for defense responses against the necrotrophic fungus Alternaria brassicicola. The miRNA pathway mutant ago1 exhibits an exaggerated response when treated with A. brassicicola, proposing that AGO1 is positive regulator. We found a subset of Arabidopsis miRNAs that quickly change their expression and their abundance in AGO1 complexes in plants exposed to A. brassicicola. The miRNAs responding to pathogen treatment are mainly targeting genes encoding metabolic enzymes, proteins involved protein degradation or transposons. In case of miR163, A. brassicicola infection results in increased levels of miRNA precursors and preferential accumulation of an unspliced form of pri-miR163, suggesting that A. brassicicola infection changes the transcriptional and post-regulation of pri-miRNAs. miR163 acts as a negative regulator of plant defense because mir163 mutants are more resistant when treated with A. brassicicola. Taken together, our results reveal the existence of positively and negatively acting Arabidopsis miRNA modulating the defense responses against A. brassicicola and highlight the importance of host miRNAs in the interaction between plants and necrotrophic pathogens.
2019-06-17 | GSE83487 | GEO
Project description:Plant microRNAs (miRNAs) have been implicated in plant immunity. These mainly focusing Arabidopsis thaliana threatened by (hemi-)biotrophic pathogens such as the bacterial pathogen Pseudomonas syringae. Here, we show that the Arabidopsis miRNA pathway is important for defense responses against the necrotrophic fungus Alternaria brassicicola. The miRNA pathway mutant ago1 exhibits an exaggerated response when treated with A. brassicicola, proposing that AGO1 is positive regulator. We found a subset of Arabidopsis miRNAs that quickly change their expression and their abundance in AGO1 complexes in plants exposed to A. brassicicola. The miRNAs responding to pathogen treatment are mainly targeting genes encoding metabolic enzymes, proteins involved protein degradation or transposons. In case of miR163, A. brassicicola infection results in increased levels of miRNA precursors and preferential accumulation of an unspliced form of pri-miR163, suggesting that A. brassicicola infection changes the transcriptional and post-regulation of pri-miRNAs. miR163 acts as a negative regulator of plant defense because mir163 mutants are more resistant when treated with A. brassicicola. Taken together, our results reveal the existence of positively and negatively acting Arabidopsis miRNA modulating the defense responses against A. brassicicola and highlight the importance of host miRNAs in the interaction between plants and necrotrophic pathogens.
2019-06-17 | GSE83478 | GEO
Project description:Responses tophytoalexins in the necrotrophic fungus Alternaria brassicicola
| PRJNA589555 | ENA
Project description:Transcriptional responses of Bdtf1-deletion mutant to the phytoalexin brassinin in the necrotrophic fungus Alternaria brassicicola
| PRJNA254725 | ENA
Project description:This study describes the gel-free phosphoproteomic analysis the phytopathogenic fungi Alternaria brassicicola and Botrytis cinerea grown in vitro under non-limiting conditions.
2014-06-09 | PXD000817 | Pride
Project description:Fungal-Specific Transcription Factor AbPf2 Activates Pathogenicity in Alternaria brassicicola
| PRJNA169609 | ENA
Project description:Alternaria brassicicola is a successful saprophyte and necrotrophic plant pathogen. Molecular determinants of its life style shift between saprophyte and pathogen, however, are unknown. To identify these determinants we studied nonpathogenic mutants of a transcription factor-coding gene, AbPf2. Frequency and timing of germination and appressorium formation on host plants were similar between the nonpathogenic Δabpf2 mutants and wild-type A. brassicicola. The mutants were also similar in vitro to wild-type A. brassicicola in vegetative growth, conidium production, and responses to chemical stressors, such as a phytoalexin, reactive oxygen species, and osmolites. The mutants, however, did not penetrate host plant tissues, though their hyphae continued to grow on the plant surface. Transcripts of the AbPf2 gene increased exponentially soon after wild-type conidia encountered their host plants. A small amount of AbPf2 protein, monitored by fused green fluorescent protein, was located in both the cytoplasm and nuclei of young, mature conidia. The protein level decreased during saprophytic growth but increased several-fold during pathogenesis. Levels of both the proteins and transcripts sharply declined following colonization of host tissues beyond the initial infection site. When the transcription factor was expressed at an induced level in the wild type during early pathogenesis, the expression of 106 fungal genes was down-regulated in the Δabpf2 mutants. Notably, 33 of the 106 genes encoded secreted proteins, including eight putative effector proteins. Plants inoculated with Δabpf2 mutants expressed higher levels of genes associated with photosynthesis, the pentose phosphate pathway, and primary metabolism, but lower levels of defense-related genes. Our results suggest that conidia of A. brassicicola are programmed as saprophytes, but become parasites upon contact with their hosts. AbPf2 coordinates this transformation by expressing pathogenesis-associated genes, including those coding for effectors.
2013-09-30 | GSE38984 | GEO
Project description:Alternaria brassicicola is a successful saprophyte and necrotrophic pathogen with a broad host range. It produces secondary metabolites that marginally affect virulence, in contrast to many A. alternata strains that produce secondary metabolites as host-specific pathogenicity factors. Cell wall-degrading enzymes (CWDEs) have been considered important for pathogenesis, but no CWDEs have been identified as significant virulence factors in A. brassicicola. In this study, we discovered mutants of a gene, AbVf19, which consistently produced smaller lesions than the wild type. The mutants grew slower than the wild type on an axenic medium with pectin as a major carbon source. Gene expression comparisons identified several hydrolytic enzyme-coding genes being down-regulated in the mutant during a late stage of infection. These down-regulated genes comprised a small fraction of genes within each family. Three of these genes had mutants that showed no or little change in virulence. This suggested that each down regulated gene only made a small contribution to virulence, or that their functions were redundant. This study demonstrated the existence and importance of a transcription factor that regulates a suite of genes that are probably important for decomposing and utilizing plant material during the late stage of plant infection. gene expression profile comparisons between wild type and a transcription factor mutant during host infection
2012-05-03 | E-GEOD-33148 | biostudies-arrayexpress
Project description:In this study, we gained further insights into the mechanisms involved in the seed infection process by analysing the transcriptomic responses of germinated spores of A.brassicicola exposed to water stress.
2019-06-29 | GSE133507 | GEO