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Bj H2O2 prolonged exposure vs. non-treatment

ABSTRACT: Genome-wide transcriptional profiling of cells exposed to 0.3 mM H2O2 from time of inoculation.

ORGANISM(S): Bradyrhizobium japonicum Bradyrhizobium diazoefficiens USDA 110

PROVIDER: GSE26960 | GEO | 2011/07/30

SECONDARY ACCESSION(S): PRJNA136971

REPOSITORIES: GEO

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Bj H2O2 prolonged exposure vs. non-treatment

Project description:Genome-wide transcriptional profiling of cells exposed to 0.3 mM H2O2 from time of inoculation. Three independent biological materials were prepared for cells exposed to 0.3 mM H2O2 during growth and non-treated cells. A total 6 arrays which includes dye swap were analyzed

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Identification of putative H2O2 regulated genes during the establishment of the Sinorhizobi...

Project description:The involvement of ROS in the legume – Rhizobium symbiotic interaction has been highlighted (Santos et al., 2001; Rubio et al., 2004). This interaction is characterized by the formation of a new organ on the root, the nodule and by the penetration, in parallel, of the bacteria into the root tissue via an infection thread (IT) (Parniske and Downie, 2003; Gage, 2004). H2O2 production has been shown in ITs during the Medicago – Sinorhizobium meliloti interaction (Santos et al., 2001). Moreover, S. meliloti mutants impaired in H2O2 detoxification mechanism possess in planta symbiotic phenotypes. As H2O2 production is known to orchestrate plant gene expression, our goal is focused on identifying the H2O2 regulated genes in the symbiotic process. We focus our analysis in the M. truncatula transcriptome as we are characterising the S. meliloti H2O2 transcriptome. -M. truncatula seedlings were grown in axenic condition on modified Fahraeus medium during seven days. Then they were transferred on new plates supplemented either with dimethyl sulfoxide (DMSO, mock treatement) or diphenylene iodonium (DPI, 10 µM). Twenty four hours later, they were inoculated either with water (mock inoculation; DMSO-H2O and DPI-H2O) or wild type S. meliloti 2011 strain (DMSO-INOC and DPI-INOC). Roots without apexes were harvested 48 hours after inoculation. After RNA extraction (Trizol), quality of the treatment was verified by RT-PCR (ENOD11: inoculation efficiency; GSHS1: DNA contamination; MTC27: constitutive) Keywords: treated vs untreated comparison

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