Transcriptional responses of Herbaspirillum seropedicae to environmental phosphate concentration
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ABSTRACT:
PROVIDER: PRJNA706993 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR13863672.fastq.gz | Fastqsanger.gz | |||
| SRR13863673.fastq.gz | Fastqsanger.gz | |||
| SRR13863674.fastq.gz | Fastqsanger.gz | |||
| SRR13863675.fastq.gz | Fastqsanger.gz | |||
| SRR13863676.fastq.gz | Fastqsanger.gz |
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Project description:Purpose: The global changes of H. seropedicae SmR1 were evaluated in response to environmental Pi conditions, based on differential intracellular polyP levels Methods: Three independent samples (biological replicates) of H. seropedicae SmR1 cells grown in NFb5 or NFb50 media after 9 h of growth were used to construct 6 sequencing libraries.The libraries were amplified and enriched using the Ion PI Hi-QTM OT2 200 Kit, and sequenced with the Ion PI Hi-QTM Sequencing 200 kit on an Ion PITM Chip Kit v3. Obtained sequences were trimmed, mapped and analyzed using CLC Genomics Workbench 7.5.1 (Qiagen) against the H. seropedicae SmR1 genome (NC_014323). Differential gene expression was accessed using the DESeq2 package. qRT–PCR validation was performed using High Capacity cDNA Reverse Transcription Kit (Applied Biosystems), and quantified in triplicate using the Power SYBR-Green PCR MasterMix on a Step-One Plus Real Time-PCR System (Applied Biosystems). Results: After sequencing, 26 and 35 total million reads were obtained for NFb50 and NFb5 conditions, respectively, and from those, 12 million and 16 million reads were uniquely mapped to the H. seropedicae SmR1 genome. Biological replicates showed a very high level of correlation (r2 > 0.98). Among the 4805 genes of the H. seropedicae SmR1 genome, 3976 genes were expressed considering a read coverage equal or higher than three-fold. 1330 genes show expression levels statistically different (p-value ≤ 0.05) from which 670 had fold changes of 2 or higher and were considered differentially expressed genes (DEG) in NFb50 vs NFb5 transcriptome, being 385 down-regulated and 285 up-regulated. To confirm the differential expression observed by the RNA-seq data, the regulation of some genes was confirmed by RT-qPCR. Molecular and physiological analyses revealed that features related to Pi metabolism, bacterial flagella biosynthesis and chemotaxis, energy production, and polyhydroxybutyrate metabolism were induced in the mentioned condition, while aspects involved in adhesion, and stress response were repressed. Since environmental conditions can influence the effectiveness of the PGPB, enhancement of bacterial robustness to withstand different conditions is an interesting challenge Conclusions: The present study demonstrated that variations in environmental Pi concentration affect H. seropedicae bacterial traits related to survival and other important physiological characteristics. The obtained data could serve not only to understand the bacterial behavior in respect to changes in rhizospheric Pi gradients, but also as a base to design strategies to improve different bacterial features focusing in biotechnological and/or agricultural purposes.
2021-03-06 | GSE168341 | GEO
Project description:Herbaspirillum seropedicae is a Betaproteobacterium capable of colonizing epiphytically and endophytically commercial grasses, promoting plant growth. In this study, we utilized RNA-seq to compare the transcriptional profiles of planktonic and maize root-attached H. seropedicae SmR1.
2015-02-28 | E-MTAB-3026 | biostudies-arrayexpress
Project description:Herbaspirillum seropedicae is a nitrogen-fixing endophytic bacterium associated with important cereal crops, which promotes plant growth, increasing their productivity. The understanding of the physiological responses of this bacterium to different concentrations of prevailing nutrients as phosphate (Pi) is scarce. In some bacteria, culture media Pi concentration modulates the levels of intracellular polyphosphate (polyP), modifying their cellular fitness. Here, global changes of H. seropedicae SmR1 were evaluated in response to environmental Pi concentrations, based on differential intracellular polyP levels. Cells grown in high-Pi medium (50 mM) maintained high polyP levels in stationary phase, while those grown in sufficient Pi medium (5 mM) degraded it. Through a RNA-seq approach, comparison of transcriptional profiles of H. seropedicae cultures revealed that 670 genes were differentially expressed between both Pi growth conditions, with 57% repressed and 43% induced in the high Pi condition. Molecular and physiological analyses revealed that aspects related to Pi metabolism, biosynthesis of flagella and chemotaxis, energy production, and polyhydroxybutyrate metabolism were induced in the high-Pi condition, while those involved in adhesion and stress response were repressed. The present study demonstrated that variations in environmental Pi concentration affect H. seropedicae traits related to survival and other important physiological characteristics. Since environmental conditions can influence the effectiveness of the plant growth-promoting bacteria, enhancement of bacterial robustness to withstand different stressful situations is an interesting challenge. The obtained data could serve not only to understand the bacterial behavior in respect to changes in rhizospheric Pi gradients but also as a base to design strategies to improve different bacterial features focusing on biotechnological and/or agricultural purposes.
| S-EPMC8222739 | biostudies-literature
Project description:Herbaspirillum seropedicae are β-proteobacteria that establish as endophytes in various plants. They are able to consume diverse carbon sources, including hexoses and pentoses like D-xylose. D-xylose catabolism pathways have been described in some microorganisms, but databases of genes involved in these routes are limited. This is of special interest in biotechnology, considering that D-xylose is the second most abundant sugar in nature. Furthermore, it is found in some potential raw materials such as lignocellulosic biomass. In this work we present a study of D-xylose catabolism pathways in H. seropedicae strain Z69, using RNA-seq analysis and the subsequent study of phenotypes determined in targeted mutants in corresponding identified genes. G5B88_22805 gene, designated xylB, encodes a NAD+- dependent D-xylose dehydrogenase. Mutant Z69∆xylB was still able to grow on D-xylose, although at a reduced rate. This is due to expression of an L-arabinose dehydrogenase encoded by G5B88_05250 gene, and was thus able to use D-xylose as substrate. According to our results, H. seropedicae Z69 uses non-phosphorylative pathways to catabolize D-xylose. The lower portion of metabolism involves co-expression of two routes: Weimberg pathway that produces α-ketoglutarate and a novel pathway recently described that produces pyruvate and glycolate. This novel pathway seems to be essential since a mutant in the last step of this pathway, Z69∆G5B88_06410, was unable to grow on D‑xylose.
2021-03-01 | GSE162430 | GEO
Project description:Herbaspirillum seropedicae is a diazotrophic bacterium which associates endophytically with economically important gramineae. Flavonoids such as naringenin, have been shown to have an effect on the interaction between H. seropedicae and its host plants. We used a high-throughput sequencing based method (RNA-Seq) to access the influence of naringenin on the whole transcriptome profile of H. seropedicae.
2015-04-30 | E-MTAB-3435 | biostudies-arrayexpress
Project description:Herbaspirillum seropedicae SmR1 Genome sequencing
| PRJNA47945 | ENA
Project description:Herbaspirillum seropedicae SmR1 was grown in NFbHPN medium until OD600nm of 0.6, when 5mM phenol or 2,5mM benzoic acid was added to the medium. After 30 minutes of growth, the cells were collected by centrifugation and total RNA was extracted with RiboPureBacteria. Also, a derivative strain from Herbaspirillum seropedicae SmR1 resistant to 1mM phenol (named strain RP) was grown in NFbHPN medium containing 1mM phenol until OD600nm of 0.6, then 5mM phenol was added to the medium. After 30 minutes of growth, the cells were collected by centrifugation and total RNA was extracted with RiboPureBacteria. All samples were depleted for ribossomal RNA e sequenced with Solid plataform.
2016-04-01 | E-MTAB-3467 | biostudies-arrayexpress
Project description:Herbaspirillum seropedicae global studies
| PRJNA422797 | ENA
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| PRJNA463041 | ENA
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| PRJNA710619 | ENA