Biological potential of the alien red alga Asparagopsis taxiformis and characterization of its culturable associated bacteria

Ktari, L.; Ismail, Amel; Selmi, H.; Hmani, Imen; Bour, Monia El

doi:10.1007/s10811-022-02818-8

Cited by 2 publications

(2 citation statements)

References 83 publications

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“…The extract was obtained with a mixture of methanol/water, which provides a higher yield of phenolic compounds than ethanol solvent. Furthermore, the dried seaweed was collected in a locality on Tunisia (Ktari et al, 2022). In a separate study, a total phenolic content of 1.71 ± 0.13 mg GAE /g was reported from a dried seaweed collected on Madeira Island off the African coast (Nunes et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Baja Peninsula seaweeds against plant pathogens

González-Castro,

Rojas-Contreras,

Romero-Bastidas

et al. 2024

Preprint

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The widespread use of synthetic pesticides to control pests has generated serious consequences on the environment and human health. Currently, efforts focused on the search for new pesticides with less impact on the environment have been doubled. Marine algae synthesize compounds with activity against various agricultural pests (insects, nematodes, and fungi); however, marine pesticides are an underdeveloped alternative. This represents an opportunity to explore new sources of compounds. The objective of this work is to evaluate the antimicrobial, nematicidal and insecticidal activity of seaweed extracts against pathogens of agricultural importance. Therefore, seaweeds were collected from different locations at the Baja California peninsula, Mexico, and ethanolic extracts were obtained. The antibacterial and antifungal activity against five phytopathogenic strains and Fusarium oxysporum was evaluated by disc diffusion on agar. Nematicidal activity was assessed by egg hatching inhibition on Meloidogyne incognita and insecticidal activity against maize weevil Sitophilus zeamais. Regarding the antibacterial potential, Laurencia johnstonii, Asparagopsis taxiformis and Dictyota dichotoma showed higher inhibition against all the strains. Padina concrescens exhibited the highest percentage of egg hatching inhibition against M. incognita (59%) followed by L. johnstonii (48%). All the seaweeds cause mortality of S. zeamais. However, the highest insecticidal activity was found on L. johnstonii (71.9%). Red and brown seaweeds showed in general higher content of total phenolic compounds. Red and brown seaweed showed great potential for the control of phytopathogens through appropriate agricultural practices. However, further research is necessary to identify the active compounds.

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Section: Discussionmentioning

confidence: 99%

Evaluation of Baja Peninsula seaweeds against plant pathogens

González-Castro,

Rojas-Contreras,

Romero-Bastidas

et al. 2024

Preprint

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“…Compared with Ktari et al (2022), the MAR index of A. taxiformis-associated bacteria ranged from 0.11 to 0.78, with more than 60% of strains showing resistance to antibiotics. However, in the present study, the MAR index was between 0.46 and 0.93, which shows that bacteria isolated from Ulva thallus were more resistant to antibiotics; this resistance may be due to a high level of expose to antibiotics through anthropic pollution characterizing the sampling site Ghar El Melh lagoon.…”

Section: Figurementioning

confidence: 95%

Biotechnological potential of Ulva ohnoi epiphytic bacteria: enzyme production and antimicrobial activities

et al. 2023

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Seaweed surfaces harbor diverse epibiotic bacterial communities with functions related to morphogenesis, host health, and defense. Among seaweed holobionts, culturable strains can represent innovative sources of bioactive compounds and enzymes. The global industrial demand for microbial enzymes is continually growing in order to improve certain manufacturing processes with new perspectives of industrial exploitation. In this regard, the present study focuses on the enzymatic production and the antimicrobial activities of culturable epibiotic bacteria of Ulva from the Tunisian coast. Culturable associated bacteria were isolated and molecular identification was realized by 16S rRNA gene sequencing. For each strain, eight enzymatic activities were investigated: amylase, hemolysis, DNase, cellulase, lecithinase, lipase, gelatinase, and chitinase. The antimicrobial activity of Ulva-associated bacteria was evaluated against seven pathogenic bacteria, Escherichia coli, Vibrio anguillarum, Vibrio alginoliticus, Pseudomonas aeruginosa, Aeromonas hydrophila, Salmonella typhymurium, and Staphylococcus aureus, and one yeast, Candida albicans. The antibiotic resistance of isolated strains was determined for 15 commonly used antibiotics. The phylogenetic analysis revealed that the isolates belonged to Alphaproteobacteria (3), Gammaproteobacteria (5), Actinobacteria (3), and Firmicutes (4) phyllum. The majority of the isolates (66%) produced simultaneously more than one enzyme. Hemolysis was produced by 46.6% of isolates, while DNase was produced by 33% of strains. On the other hand, 13% of strains produced lecithinase, gelatinase, cellulase, and lipase. No chitinase was produced by the isolated bacteria. In addition, 60% of isolates displayed antimicrobial activity against at least one pathogenic strain. All Ulva ohnoi-associated bacteria were resistant to at least seven commonly used antibiotics. These results highlighted the occurrence of several enzymatic activities within Ulva-associated bacteria that can have potential uses in the industrial sector.

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Biological potential of the alien red alga Asparagopsis taxiformis and characterization of its culturable associated bacteria

Cited by 2 publications

References 83 publications

Evaluation of Baja Peninsula seaweeds against plant pathogens

Evaluation of Baja Peninsula seaweeds against plant pathogens

Biotechnological potential of Ulva ohnoi epiphytic bacteria: enzyme production and antimicrobial activities

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