Isolation of potential phototrophic purple non-sulphur bacteria in paddy and their effects on paddy seedlings in hydroponic culture

Pavitra, B. V.; Sreenivasa, M. N.; Savalgi, V. P.; Shirnalli, Geetha

doi:10.5897/ajmr2013.6524

Cited by 2 publications

(2 citation statements)

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“…In the studied soils, several genera of known aerobic sulfur oxidizing bacteria such as Delftia, Thiobacillus, Thiofaba, Pseudomonas and Halothiobacillus (Behera et al 2014), anaerobic sulfur oxidizing bacteria like Rhodobacter, Sulfurovum and Sulfurimonas (Pavitra et al 2015) as well as sulfate-reducing bacteria (SRBs) have been detected. This points out to the presence of a sulfur cycle in the rhizosphere soils.…”

Section: Sulfur and Nitrogen Cycles In The Rhizospehere Soilsmentioning

confidence: 99%

Bacterial communities in the rhizosphere of Phragmites australis from an oil-polluted wetland

Abed

Al-Kharusi

Gkorezis

et al. 2017

Archives of Agronomy and Soil Science

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Although Phragmites australis is commonly planted in constructed wetlands, very little is known about its roots-associated bacterial communities, especially in wetlands used for the remediation of oil produced waters. Here, we describe the bacterial diversity, using molecular (illumina MiSeq sequencing) and cultivation techniques, in the rhizosphere soils of P. australis from an oil-polluted wetland in Oman. The obtained isolates were tested for their plant-growth promoting properties. Most sequences belonged to Proteobacteria, Bacteriodetes and Firmicutes. Sequences of potential hydrocarbondegrading bacteria (e.g. Ochrobactrum, and Pseudomonas) were frequently encountered. All soils contained sequences of known sulfur-oxidizing (e.g. Thiobacillus, Thiofaba, Rhodobacter and Sulfurovum) and sulfate-reducing bacteria, although the latter group made up only 0.1% to 3% of total sequences. The obtained isolates from the rhizosphere soils were phylogenetically affiliated to Serratia, Acinetobacter, Xenorhabdus, Escherichia and Salmonella. All strains were able to solubilize phosphate and about half were capable of producing organic acids and 1-aminocyclopropane-1-carboxylate (ACC) deaminase. Around 42% of the strains had the ability to produce indole acetic acid and siderophores. We conclude that the rhizosphere soils of P. australis in oil polluted wetlands harbor diverse bacterial communities that could enhance the wetland performance through hydrocarbon degradation, nutrient cycling and supporting plant growth.

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Section: Sulfur and Nitrogen Cycles In The Rhizospehere Soilsmentioning

confidence: 99%

Bacterial communities in the rhizosphere of Phragmites australis from an oil-polluted wetland

Abed

Al-Kharusi

Gkorezis

et al. 2017

Archives of Agronomy and Soil Science

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“…When effect of PNSB single strain supplementation on rice seedling growth and nitrogen content was investigated in hydroponic cultures containing ammonium chloride, the best growth (plant height, root length, and dry weight) and the highest nitrogen content after 30 days of sowing were observed in cell supplementation of Rhodobacter sp. isolated from paddy soil [117]. Inoculant cells of R. palustris significantly increased total nitrogen and ammonium concentrations in two different paddy soils [102].…”

Section: Inoculation Of Rice Cultures With Pnsb Cellsmentioning

confidence: 97%

Potential of Phototrophic Purple Nonsulfur Bacteria to Fix Nitrogen in Rice Fields

Maeda

2021

Microorganisms

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Biological nitrogen fixation catalyzed by Mo-nitrogenase of symbiotic diazotrophs has attracted interest because its potential to supply plant-available nitrogen offers an alternative way of using chemical fertilizers for sustainable agriculture. Phototrophic purple nonsulfur bacteria (PNSB) diazotrophically grow under light anaerobic conditions and can be isolated from photic and microaerobic zones of rice fields. Therefore, PNSB as asymbiotic diazotrophs contribute to nitrogen fixation in rice fields. An attempt to measure nitrogen in the oxidized surface layer of paddy soil estimates that approximately 6–8 kg N/ha/year might be accumulated by phototrophic microorganisms. Species of PNSB possess one of or both alternative nitrogenases, V-nitrogenase and Fe-nitrogenase, which are found in asymbiotic diazotrophs, in addition to Mo-nitrogenase. The regulatory networks control nitrogenase activity in response to ammonium, molecular oxygen, and light irradiation. Laboratory and field studies have revealed effectiveness of PNSB inoculation to rice cultures on increases of nitrogen gain, plant growth, and/or grain yield. In this review, properties of the nitrogenase isozymes and regulation of nitrogenase activities in PNSB are described, and research challenges and potential of PNSB inoculation to rice cultures are discussed from a viewpoint of their applications as nitrogen biofertilizer.

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Isolation of potential phototrophic purple non-sulphur bacteria in paddy and their effects on paddy seedlings in hydroponic culture

Cited by 2 publications

References 24 publications

Bacterial communities in the rhizosphere of Phragmites australis from an oil-polluted wetland

Bacterial communities in the rhizosphere of Phragmites australis from an oil-polluted wetland

Potential of Phototrophic Purple Nonsulfur Bacteria to Fix Nitrogen in Rice Fields

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