Bacterial diversity of the rhizosphere and nearby surface soil of rice (Oryza sativa) growing in the Camargue (France)

Osman, Jorge R.; Fernandes, Gustavo Ribeiro; DuBow, Michael S.

doi:10.1016/j.rhisph.2017.03.002

Cited by 25 publications

(16 citation statements)

References 68 publications

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“…This fact could explain the high SI obtained with the BSB1 strain. The genus Enterobacter has also been recognized to promote plant growth and one of its features is the solubilization of inorganic phosphorus [23,32].…”

Section: In Vitro Inorganic Phosphate Solubilizationmentioning

confidence: 99%

Rice-Associated Rhizobacteria as a Source of Secondary Metabolites against Burkholderia glumae

et al. 2020

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Various diseases, including bacterial panicle blight (BPB) and sheath rot, threaten rice production. It has been established that Burkholderia glumae (B. glumae) is the causative agent of the above mentioned pathologies. In the present study, antagonistic activity, growth promotion, and the metabolite profiles of two rhizobacteria, isolated in different paddy fields, were assessed against B. glumae. Strains were identified based on 16S rRNA gene sequences, and the phylogenetic analyses showed that both strains belong to the genus Enterobacter, with high similarity to the strain Enterobacter tabaci NR146667.2 (99%). The antagonistic activity was assessed with the disc diffusion method. Active fractions were isolated through a liquid/liquid extraction with ethyl acetate (EtOAc) from the fermentation media, and their antibacterial activities were evaluated following the Clinical and Laboratory Standards Institute (CLSI) guidelines. The Pikovskaya modified medium was used to test the ability of in vitro inorganic phosphorus solubilization, and BSB1 proved to be the best inorganic phosphorus solubilizer, with a solubilization index (SI) of 4.5 ± 0.2. The glass-column fractionation of the EtOAc extracted from BCB11 produced an active fraction (25.9 mg) that inhibited the growth of five B. glumae strains by 85–95%. Further, metabolomic analysis, based on GC–MS, showed 3-phenylpropanoic acid (3-PPA) to be the main compound both in this fraction (46.7%), and in the BSB1 extract (28.6%). This compound showed antibacterial activity against all five strains of B. glumae with a minimum inhibitory concentration (MIC) of 1000 mg/L towards all of them. The results showed that rice rhizosphere microorganisms are a source of compounds that inhibit B. glumae growth and are promising plant growth promoters (PGP).

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Section: In Vitro Inorganic Phosphate Solubilizationmentioning

confidence: 99%

Rice-Associated Rhizobacteria as a Source of Secondary Metabolites against Burkholderia glumae

et al. 2020

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“…The rhizosphere is the defined region of soil surrounding a plant’s roots, which is influenced by root exudates and the soil microbiome (Osman et al, 2017). The microbiome consists of consortium of diverse microbial species found in the soil rhizosphere (Lakshmanan, et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…The microbiome consists of consortium of diverse microbial species found in the soil rhizosphere (Lakshmanan, et al, 2015). Previous studies have shown that on a whole, the microbiome functions to positively influence the plants they surround (Osman et al, 2017). The beneficial bacteria found in the rhizosphere are termed plant growth promoting rhizobacteria (PGPR) (Lakshmanan et al, 2015; Osman et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have shown that on a whole, the microbiome functions to positively influence the plants they surround (Osman et al, 2017). The beneficial bacteria found in the rhizosphere are termed plant growth promoting rhizobacteria (PGPR) (Lakshmanan et al, 2015; Osman et al, 2017). They are known to promote nutrient acquisition, positively influence growth and development, influence plant physiology and metabolism, protect against pathogens, and play a role in immune response and tolerating abiotic stressors (Osman et al, 2017; Busby et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…The beneficial bacteria found in the rhizosphere are termed plant growth promoting rhizobacteria (PGPR) (Lakshmanan et al, 2015; Osman et al, 2017). They are known to promote nutrient acquisition, positively influence growth and development, influence plant physiology and metabolism, protect against pathogens, and play a role in immune response and tolerating abiotic stressors (Osman et al, 2017; Busby et al, 2017). For example, previous studies where bacteria were isolated from the rhizosphere of M-104 rice, a japonica cultivar grown abundantly in California, have shown a beneficial response in rice against both biotic and abiotic stress (Lakshmanan et al, 2015; Spence et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Rice rhizospheric microbes confer limited Arsenic protection under high Arsenic conditions

Gundlah-Mooney

2020

Preprint

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Rice (Oryza sativa) is a staple food crop worldwide and plays a critical role in ensuring food security as the global population continues to expand exponentially. Groundwater contamination with Arsenite [As(III)], a naturally occurring inorganic form of arsenic (As), leads to uptake and accumulation within rice plants. As a result, grain yield is lowered, the overall plant health is diminished, and there is a risk of arsenic toxicity from grain consumption. It was previously shown that a novel bacterial strain from the rice rhizosphere may reduce As accumulation in rice plants exposed to low levels of environmental As. We hypothesized that different rice varieties may exhibit varying responses to high As levels, resulting in differences in As uptake and toxicity. Utilizing the natural rice rhizospheric microbes, we initiated a set of hydroponic experiments with two rice varieties, Nipponbare (As tolerant) and IR66 (As susceptible). Rice varieties exposed to high As(III) concentration (50 uM) showed changes in both aboveground and belowground traits. As-tolerant Nipponbare varieties show grain production at high As(III) concentrations compared to the As-susceptible IR66 variety. Supplementation of natural rice rhizospheric microbes as single inoculums showed varied responses in both As-tolerant and As-susceptible varieties. Three natural rice rhizospheric microbes Pantoea sps (EA106), Pseudomonas corrugata (EA104), and Arthrobacter oxydans (EA201) were selected based on previously reported high Iron (Fe)-siderophore activity and were used for the hydroponic experiments as well as a non-rice rhizospheric strain, Bacillus subtilis UD1022. Interestingly, treatment with two strains (EA104 and EA201) led to a reduction in As(III) uptake in shoots, roots, and grains, and the degree of reduction of As(III) was pronounced in As-susceptible IR66 varieties. Non-rice rhizospheric UD1022 showed subtle protection against high As toxicity. High As(III) treatment led to a lack or delay of flowering and seed set in the As-susceptible IR66 variety. The data presented here may further the understanding of how beneficial microbes in the rhizosphere may help rice plants cope with high concentrations of As in the soil or groundwater.

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Rhizospheric Microbiome: Biodiversity, Current Advancement and Potential Biotechnological Applications

Mokrani

Nabti

2020

Advances in Plant Microbiome and Sustainable Agriculture

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Bacterial diversity of the rhizosphere and nearby surface soil of rice (Oryza sativa) growing in the Camargue (France)

Cited by 25 publications

References 68 publications

Rice-Associated Rhizobacteria as a Source of Secondary Metabolites against Burkholderia glumae

Rice-Associated Rhizobacteria as a Source of Secondary Metabolites against Burkholderia glumae

Rice rhizospheric microbes confer limited Arsenic protection under high Arsenic conditions

Rhizospheric Microbiome: Biodiversity, Current Advancement and Potential Biotechnological Applications

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