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Herbaspirillum seropedicae transcript profile on maize rhizosphere

ABSTRACT: Herbaspirillum seropedicae transcript profile on maize rhizosphere

PROVIDER: PRJEB7583 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR660616.fastq.gz	Fastqsanger.gz
	ERR660617.fastq.gz	Fastqsanger.gz
	ERR660618.fastq.gz	Fastqsanger.gz
	ERR660619.fastq.gz	Fastqsanger.gz
	ERR660620.fastq.gz	Fastqsanger.gz

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Herbaspirillum seropedicae transcript profile on maize rhizosphere

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.

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Quantitative proteomic analysis reveals altered enzyme expression profile in Zea mays roots during the early stage of colonization by Herbaspirillum seropedicae

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Transcriptome profile of Herbaspirillum seropedicae SmR1 grown in the presence of aromatic compounds

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.

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Multiomic approaches reveal hormonal modulation and nitrogen uptake and assimilation on the initial growth of maize inoculated with Herbaspirillum seropedicae

Project description:Herbaspirillum seropedicae is an endophytic bacterium that can fix nitrogen and promote a hormonal imbalance that leads to a plant growth-promoting effect when used as a microbial inoculant. Studies focused on mechanisms of action are crucial for a better understanding of the bacteria-plant interaction and optimization of plant growth-promoting response. The work aims to understand the underlined mechanisms responsible for the early stimulatory growth effects of the H. seropedicae inoculation in maize. To perform it, we combined transcriptomic and proteomic approaches with physiological analysis. The results obtained with the inoculation showed increased root biomass (233 and 253%) and shoot biomass (249 and 264%), respectively, for the fresh and dry mass of maize seedlings and increased green content and development. Omics data analysis for the positive biostimulation phenotype revealed that inoculation increases N-uptake and N-assimilation machinery through differential expressed nitrate transporters and amino acids pathway, as well carbon/nitrogen metabolism integration by the tricarboxylic acid cycle and the polyamines pathway. Additionally, phytohormone levels of root and shoot tissues increased in bacterium-inoculated-maize plants leading to feedback regulation by the ubiquitin-proteasome system. The early biostimulatory effect of H. seropedicae partially results from hormonal imbalance coupled with efficient nutrient uptake-assimilation and a boost in primary anabolic metabolism of carbon-nitrogen integrative pathways.

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D-xylose catabolic pathways expressed in Herbaspirillum seropedicae

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.

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