Increased yields of Rhizobium japonicum by an extract of the green alga, Scenedesmus obliquus (276-3a)

Fingerhut, U.; Webb, L. E.; Soeder, Carl J.

doi:10.1007/bf00253785

Cited by 7 publications

(2 citation statements)

References 8 publications

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“…Other studies also suggest that microalgae cultures can influence the growth rate of PGPB. Fingerhut et al studied the effect of Scenedesmus obliquus hot water extract on the growth of Rhizobium japonicum soil bacteria [ 24 ]. Their results showed that increasing the concentration of the algae extract up to 1% in the culture media promoted the growth of the bacterium while adding yeast extract (at concentrations above 0.1%) inhibited it.…”

Section: Introductionmentioning

confidence: 99%

Chemotactic Interactions of Scenedesmus sp. and Azospirillum brasilense Investigated by Microfluidic Methods

Greipel,

Nagy,

Csákvári

et al. 2024

Microb Ecol

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The use of algae for industrial, biotechnological, and agricultural purposes is spreading globally. Scenedesmus species can play an essential role in the food industry and agriculture due to their favorable nutrient content and plant-stimulating properties. Previous research and the development of Scenedesmus-based foliar fertilizers raised several questions about the effectiveness of large-scale algal cultivation and the potential effects of algae on associative rhizobacteria. In the microbiological practice applied in agriculture, bacteria from the genus Azospirillum are one of the most studied plant growth-promoting, associative, nitrogen-fixing bacteria. Co-cultivation with Azospirillum species may be a new way of optimizing Scenedesmus culturing, but the functioning of the co-culture system still needs to be fully understood. It is known that Azospirillum brasilense can produce indole-3-acetic acid, which could stimulate algae growth as a plant hormone. However, the effect of microalgae on Azospirillum bacteria is unclear. In this study, we investigated the behavior of Azospirillum brasilense bacteria in the vicinity of Scenedesmus sp. or its supernatant using a microfluidic device consisting of physically separated but chemically coupled microchambers. Following the spatial distribution of bacteria within the device, we detected a positive chemotactic response toward the microalgae culture. To identify the metabolites responsible for this behavior, we tested the chemoeffector potential of citric acid and oxaloacetic acid, which, according to our HPLC analysis, were present in the algae supernatant in 0.074 mg/ml and 0.116 mg/ml concentrations, respectively. We found that oxaloacetic acid acts as a chemoattractant for Azospirillum brasilense.

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Section: Introductionmentioning

confidence: 99%

Chemotactic Interactions of Scenedesmus sp. and Azospirillum brasilense Investigated by Microfluidic Methods

Greipel,

Nagy,

Csákvári

et al. 2024

Microb Ecol

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“…Filamentous cyanobacteria are particularly suitable for the generation of a variety of valuable chemical products, some of which have nutritional value, such as vitamins, enzymes, fatty acids, and polypeptides, in addition to proteins and carbohydrates (6,12,18).…”

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confidence: 99%

Growth of Helicobacter pylori in Medium Supplemented with Cyanobacterial Extract

et al. 2003

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Solid and liquid media supplemented only with a cyanobacterial extract (CE) and free of fetal calf serum (FCS), blood, and its derivatives support the growth of Helicobacter pylori. A total of 11 strains of H. pylori isolated from gastric biopsy samples were successfully subcultured in Mueller-Hinton agar supplemented with 0.4% CE. When this medium was used for primary isolation of H. pylori, a low isolation rate (30%) was observed because of the abundant growth of contaminants. The growth kinetics of eight isolates and H. pylori reference strain NCTC 11638 in Mueller-Hinton broth (MHB) supplemented with 0.7% CE were estimated by use of growth parameters, and the results were compared with those obtained with MHB-5% FCS. For four strains the cellular concentrations obtained with CE were statistically higher (P < 0.05) than those obtained with FCS, and in some cases these values were similar to the highest values reported in the literature. Depending on the strain, the specific growth rates obtained with CE were similar to or increased compared with those obtained with FCS. The replacement of FCS by CE in H. pylori cultures would facilitate the retrieval of cultures with high cellular densities as a source of cellular and extracellular proteins free of serum. Also, CE has advantages over conventional supplements, such as easier conservation and compliance with the pressing tendency at present to avoid the use of products derived from animals.

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Potential Applications of Algae-Based Bio-fertilizer

et al. 2019

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Increased yields of Rhizobium japonicum by an extract of the green alga, Scenedesmus obliquus (276-3a)

Cited by 7 publications

References 8 publications

Chemotactic Interactions of Scenedesmus sp. and Azospirillum brasilense Investigated by Microfluidic Methods

Chemotactic Interactions of Scenedesmus sp. and Azospirillum brasilense Investigated by Microfluidic Methods

Growth of Helicobacter pylori in Medium Supplemented with Cyanobacterial Extract

Potential Applications of Algae-Based Bio-fertilizer

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