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A novel repressor for expression of a type 6 protein secretion system links nitrogen signaling with beneficial plant-microbe interactions

ABSTRACT: To investigate the regulon of the novel transcriptional regulator TssR discovered in our study We then performed gene expression profiling analysis using data obtained from RNA-seq of wild type Azoarcus olearius sp. BH72 and tssR deleted mutant cultured under microaerobic conditions with additional ammonium

ORGANISM(S): Azoarcus olearius

PROVIDER: GSE211258 | GEO | 2022/09/01

REPOSITORIES: GEO

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Transcriptome profile of wild type Azoarcus sp. BH72 grown under microaerobic condition (0.3% oxygen) compared with that grown under aerobic condition (21% oxygen), both in presence of combined nitrogen source, respectively

Project description:Low oxygen tensions are often encountered in flooded soils of rice fields by root-associated, strictly respiratory, beta proteobacterium, Azoarcus sp. BH72 which fixes nitrogen only under microaerobic condition. In this study, genome wide oligonucleotide microarrays were used compare the global transcription profile of Azoarcus sp. BH72 under microaerobic condition with cells grown under aerobic condition, both with ammonia as sole nitrogen source. The outcome of this study will provide a better insight about the establishment of this endophyte in the microaerobic environment, probably prevailing inside of the rice root niche .

2014-09-13 | GSE61387 | GEO

2014-09-13 | E-GEOD-61387 | biostudies-arrayexpress

Transcriptome comparison of the wild type strain Azoarcus sp. BH72 with that of nifLA knockout strain under nitrogen fixing condition

Project description:Azoarcus sp. BH72 is known to express nitrogenase genes endophytically in rice seedlings in gnotobiotic culture. Availability of fixed nitrogen is one of the important signals regulating the transcription of nitrogenase genes and hence nitrogen fixing activity. NifA is the essential transcription activator of nif genes. RNA isolated from the nifA knockout mutant of strain BH72 was compared with the transcriptome of wild type under nitrogen fixing condition using a global genome wide microarray approach and the differences in the gene expression profile were monitered. RNA isolated from wild type strain BH72 and nifLA mutant strain BHLAO grown respectively under microaerobic nitrogen fixing condition with glutamate as poor nitrogen source was used for two color whole genome microarray approach

2013-08-15 | E-GEOD-49912 | biostudies-arrayexpress

Transcriptome comparison of wild type Azoarcus sp. strain BH72 grown under nitrogen fixation (experiment) with cells grown with combined nitrogen (ammonia) as nitrogen source

Project description:Model endophyte Azoarcus sp. BH72 is known to contribute fixed nitrogen to its host Kallar grass by nitrogen fixation and also expresses nitrogenase genes endophytically in rice seedlings in gnotobiotic culture. Availability of fixed nitrogen is one of the important signals regulating the transcription of nitrogenase genes and hence nitrogen fixing activity. Therefore, we analysed global transcription in response to differences in the nitrogen source. Transcription profiles of cells grown microaerobically (0.6% oxygen) on minimal medium with nitrogen (N2-fixing) versus ammonium (combined nitrogen) were compared using a genome-wide microarray approach and differences in the gene expression profile were monitored.

2013-08-01 | GSE49394 | GEO

Transcriptome comparison of wild type Azoarcus sp. strain BH72 grown under nitrogen fixation (experiment) with cells grown with combined nitrogen (ammonia) as nitrogen source

2013-08-01 | E-GEOD-49394 | biostudies-arrayexpress

RNA-Seq provides new insights into the nitrogen response of Azoarcus olearius BH72 during N2-fixation beyond the nitrogen fixation process

Project description:Azoarcus olearius BH72 is a diazotrophic endophyte carrying out biological nitrogen fixation (BNF) and supplying nitrogen to its host plant. Our previous microarray approach provided insights in the transcriptome of strain BH72 under N2-fixation in comparison to ammonium-grown conditions, which already indicated induction of genes not related to the BNF process. Due to the known limitations of the technique, we might have missed additional differentially regulated genes (DEGs). Thus we used directional RNA-Seq to better comprehend the transcriptional landscape under these growth conditions. RNA-Seq detected almost 24 % of the annotated genes to be regulated, twice the amount identified by microarray. In addition to confirming entire regulated operons containing known DEGs, the new approach detected induction of genes involved in carbon metabolism and flagellar and twitching motility. On the other hand, genes encoding for proteins involved in translation and vitamin biosynthesis were detected to be suppressed. Nonetheless, strain BH72 appears not to be content with N2-fixation but is primed for alternative economic N-sources, such as nitrate, urea or amino acids: we detected strong induction of machineries for uptake and assimilation.

2021-09-06 | GSE176473 | GEO

Transcriptome comparison of the wild type strain Azoarcus sp. BH72 with that of nifLA knockout strain under nitrogen fixing condition

2013-08-15 | GSE49912 | GEO

Rice roots: Non-colonized (sterile) control vs. colonized with Azoarcus olearius BH72

Project description:Transcriptional profiling of Oryza sativa japonica Nipponbare roots after 14 days post inoculation with Azoarcus olearius BH72, the goal is to understand the transcriptomic response of rice roots to colonization by bacterial endophyte

2019-09-01 | GSE136707 | GEO

Characterization of cell density-regulated gene expression of the grass endophyte Azoarcus sp. BH72

Project description:Azoarcus sp. BH72 is able to communicate via cell density-dependent gene regulation. Here, the impact of cell-free conditioned culture supernatants, obtained from stationary phase Azoarcus wild type cultures, on gene expression was investigated determining changes in transcript profiles when early exponential aerobic cultures were incubated with cell-free culture supernatants for one and four hours. Bacterial communication via quorum sensing (QS) is involved in the regulation of several cellular mechanisms such as metabolic processes, microbe-host interactions or biofilm formation. The nitrogen-fixing model endophyte of grasses Azoarcus sp. strain BH72 shows density-dependent gene regulation in the absence of common hydrophobic autoinducers for pilA encoding the structural protein of type IV pili that are essential for plant colonization. Here, we used a transcriptomic approach to identify target genes differentially regulated under QS conditions in conditioned supernatants in comparison to standard growth conditions.

2011-12-01 | GSE25939 | GEO

Characterization of cell density-regulated gene expression of the grass endophyte Azoarcus sp. BH72

2011-12-01 | E-GEOD-25939 | biostudies-arrayexpress

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