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Comparison of Bradyrhizobium japonicum parent strain LO grown under low or high iron conditions

ABSTRACT: The purpose of the study is to identify iron-responsive genes in the bacterium Bradyrhizobium japonicum. Parent strain LO was grown under iron limitation or under iron sufficiency and compared to each other by whole genome microarray analysis. Keywords: Comparison of cells grown under low or high iron conditons

ORGANISM(S): Bradyrhizobium diazoefficiens USDA 110 Bradyrhizobium japonicum

PROVIDER: GSE4143 | GEO | 2006/03/15

SECONDARY ACCESSION(S): PRJNA104609

REPOSITORIES: GEO

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Comparison of Bradyrhizobium japonicum parent strain LO with irr mutant strain LODTM5

Project description:The purpose of the study is to identify Irr-responsive genes in the bacterium Bradyrhizobium japonicum. Parent strain LO was compared to irr mutant strain LODTM5 by whole genome microarray analysis. Both cell types were grown in iron-limited media. Keywords: Comparison of B. japonicum wild type and mutant cells

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The stress response of Bradyrhizobium japonicum

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Global consequences of phosphatidylcholine reduction in Bradyrhizobium japonicum

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Global consequences of phosphatidylcholine reduction in Bradyrhizobium japonicum

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Bradyrhizobium japonicum

Project description:Comparison of Bradyrhizobium japonicum parent strain LO grown under low or high iron conditions

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Influence of elevated atmospheric carbon dioxide on transcriptional responses of Bradyrhizobium japonicum in the soybean rhizosphere

Project description:Elevated atmospheric CO2 can influence the structure and function of rhizosphere microorganisms by altering root growth and the quality and quantity of compounds released into the rhizosphere via root exudation. In these studies we investigated the transcriptional responses of Bradyrhizobium japonicum cells growing in the rhizosphere of soybean plants exposed to elevated atmospheric CO2. Transciptomic expression profiles indicated that genes involved in carbon/nitrogen metabolism, and FixK2-associated genes, including those involved in nitrogen fixation, microanaerobic respiration, respiratory nitrite reductase, and heme biosynthesis, were significantly up-regulated under conditions of elevated CO2, relative to plants and bacteria grown under ambient CO2 growth conditions. The expression profile of genes involved in lipochitinoligosaccharide Nod factor biosynthesis and negative transcriptional regulators of nodulation genes, nolA and nodD2, were also influenced by plant growth under conditions of elevated CO2. Taken together, results of these studies indicate that growth of soybeans under conditions of elevated atmospheric CO2 influences gene expressions in B. japonicum in the soybean rhizosphere, resulting in changes to carbon/nitrogen metabolism, respiration, and nodulation efficiency. Bradyrhizobium japonicum strains were grown in the soybean rhizosphere under two different CO2 concentrations. Transcriptional profiling of B. japonicum was compared between cells grown under elevated CO2 and ambient conditions. Four biological replicates of each treatment were prepared, and four microarray slides were used for each strain.

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Characterization of the Bradyrhizobium japonicum NtrC regulon by DNA Microarray analysis.

Project description:The Bradyrhizobium japonicum NtrC regulatory protein influences gene expression in response to changes in intracellular nitrogen status. Under conditions of low nitrogen, phosphorylation of NtrC results in up-regulation of a number of genes involved in nitrogen metabolism and nitrogen acquisition. To better define the exact nature of NtrC’s influence on gene expression, a ntrC mutation was created in B. japonicum and transcriptional profiling was performed by DNA microarray analysis of both the mutant and wild type strains.

2012-07-01 | GSE23870 | GEO

Characterization of the Bradyrhizobium japonicum NtrC regulon by DNA Microarray analysis.

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Influence of elevated atmospheric carbon dioxide on transcriptional responses of Bradyrhizobium japonicum in the soybean rhizosphere

Project description:Elevated atmospheric CO2 can influence the structure and function of rhizosphere microorganisms by altering root growth and the quality and quantity of compounds released into the rhizosphere via root exudation. In these studies we investigated the transcriptional responses of Bradyrhizobium japonicum cells growing in the rhizosphere of soybean plants exposed to elevated atmospheric CO2. The results of microarray analyses indicated that atmospheric elevated CO2 concentration indirectly influences on expression of large number of Bradyrhizobium genes through soybean roots. In addition, genes involved in C1 metabolism, denitrification and FixK2-associated genes, including those involved in nitrogen fixation, microanaerobic respiration, respiratory nitrite reductase, and heme biosynthesis, were significantly up-regulated under conditions of elevated CO2 in the rhizosphere, relative to plants and bacteria grown under ambient CO2 growth conditions. The expression profile of genes involved in lipochitinoligosaccharide Nod factor biosynthesis and negative transcriptional regulators of nodulation genes, nolA and nodD2, were also influenced by plant growth under conditions of elevated CO2. Taken together, results of these studies indicate that growth of soybeans under conditions of elevated atmospheric CO2 influences gene expressions in B. japonicum in the soybean rhizosphere, resulting in changes to carbon/nitrogen metabolism, respiration, and nodulation efficiency.

2010-07-29 | GSE23296 | GEO

New target genes controlled by the Bradyrhizobium japonicum two-component regulatory system RegSR

Project description:Analysis of a mutant in the Bradyrhizobium japonicum response regulator RegR. RegR is known to control expression of the gene encoding the key regulator of nitrogen fixation NifA. This study provides insights into the RegR regulon under free-living conditions and during symbiosis. Cells of the regR mutant and the wild type were grown to mid-exponential phase in full medium (PSY) under different oxygen conditions (aerobic and microaerobic) in culture. Nodules from soybean plant infected with the regR mutant or the wild type were collected 13 and 21 days post inoculation To determine genes under control of RegR during symbiosis. This study includes also the samples GSM210238 to GSM210286. Keywords: genetic modification, time course, growth conditions

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