Antifungal properties of aqueous microalgal extracts

Schmid, Benjamin; Coelho, Luísa; Schulze, Peter S.C.; Pereira, Hugo; Santos, Tamára; Maia, Inês B.; Reis, Mário; Varela, João

doi:10.1016/j.biteb.2022.101096

Cited by 13 publications

(11 citation statements)

References 38 publications

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“…This might be explained by the increase in nutrient content that the fungus can use. Similar results were obtained in the study by Schmid et al [ 14 ], where treatment with these microalgae at a concentration of 2.0 g L −1 led to an increased growth of Alternaria alternata .…”

Section: Resultssupporting

confidence: 91%

“…Previous studies have shown the potential of algae-based products as biostimulants and as biocontrol agents for agriculture [ 14 ] due to their several bioactive compounds, such as amino acids, polypeptides, antioxidants, enzymes, phytohormones, vitamins, phenolic compounds, allelopathic chemicals, and carotenoids [ 8 , 15 , 16 , 17 , 18 , 19 , 20 ]. These compounds might enhance plant resistance by direct antagonism or via a positive effect on beneficial soil microorganisms that stimulate nutrient absorption and, thus, improve plant growth [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

“…In another study, C. vulgaris grown in wastewater was able to decrease the growth of fungi such as R. solani and F. oxysporum , as well as of oomycetes, i.e., Phytophthora capsica and Pythium ultimum [ 24 ]. Water-based extracts of T. obliquus have also displayed in vitro antifungal activities against Sclerotium rolfsii , resulting in growth inhibition of up to 32.0% [ 14 ]. Scaglioni et al [ 25 ] reported that carotenoid and phenolic extracts of Nannochloropsis sp.…”

Section: Introductionmentioning

confidence: 99%

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Chlorella vulgaris and Tetradesmus obliquus Protect Spinach (Spinacia oleracea L.) against Fusarium oxysporum

Viana,

Genevace,

Gama

et al. 2024

Plants

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Chlorella vulgaris and Tetradesmus obliquus were tested as biocontrol agents against the phytopathogenic fungus Fusarium oxysporum. This evaluation was conducted through in vitro and in vivo trials with spinach (Spinacia oleracea L.). The in vitro trials showed that C. vulgaris and T. obliquus were able to inhibit the phytopathogen, showing a similar inhibitory effect to that of the positive controls (Rovral, BASF® and Biocontrol T34, Biocontrol Technologies® S.L.). C. vulgaris aqueous suspensions at 3.0 g L−1 led to a hyphal growth of 0.55 cm, each corresponding to a reduction of 63% of fungal growth. With T. obliquus, the hyphal growth was 0.53 cm when applied at a concentration of 0.75 g L−1, having an inhibition of fungus growth of 64%. Thereafter, these results were validated in an in vivo trial on spinach using the same controls. The results revealed a lower severity and disease incidence and a reduction in the disease’s AUDPC (area under the disease progress curve) when spinach was treated with the microalgae suspensions. Overall, these findings highlight the potential of C. vulgaris and T. obliquus suspensions as promising biocontrol agents against F. oxysporum in spinach when applied through irrigation.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chlorella vulgaris and Tetradesmus obliquus Protect Spinach (Spinacia oleracea L.) against Fusarium oxysporum

Viana,

Genevace,

Gama

et al. 2024

Plants

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“…and Nannochloropsis sp. promoted Sclerotium rolfsii and Alternaria alternata growth respectively (Schmid et al, 2022). While microalgae strains must be screened against a range of phytopathogenic strains to ensure they do not promote the growth of some phytopathogenic fungi, there is potential to screen microalgae especially from the Klebsormidiophyceae, for stimulating activity of bene cial plant growth promoting fungi.…”

Section: Discussionmentioning

confidence: 99%

“…This antifungal activity was linked to the production of hydrolytic enzymes (Prasanna et al, 2008). Sclerotium rolfsii was the most susceptible and Alternaria alternata was the most resistant when tested against 5 microalgae (Schmid et al, 2022). This variability indicates that there is strong target speci city with activity depending on both the microalgae strain and the phytopathogen.…”

Section: Discussionmentioning

confidence: 99%

Cataloguing microalgae and Cyanobacteria strains from the Mosonmagyaróvár Algal Culture Collection with in vitro antagonistic activity against phytopathogenic fungi and oomycetes

et al. 2023

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Microalgae produce many secondary metabolites that are biologically active, including compounds with antifungal activity. These could potentially function as biofungicides. Selection criteria for potential strains include having good antifungal activity against speci c phytopathogenic fungi and high biomass productivity rates to ensure su cient biomass can be generated. Water extracts were prepared from 280 strains comprising of 33 Cyanophyceae strains (13 genera), 157 Chlorophyceae strains (29 genera), 80 Trebouxiophyceae strains (19 genera), 5 Klebsormidiophyceae strains (1 genus) and 1 Zygnematophyceae strain. These were tested against 9 phytopathogenic fungi. In total, 45% of the species had antifungal activity against at least one fungal pathogen. Cyanobacteria had the highest "hit-rate" (64%), followed by the Chlorophyceae (49%) and Trebouxiophyceae (30%). Water extracts of 19 strains had fungicidal activity -these were predominantly Cyanobacteria. The Cyanobacteria displayed a wider spectrum of activity with ve strains being active (either fungicidal or fungistatic) against three or more fungal strains -Trichormis variabilis MACC-304 and Tolypothrix tennis MACC-205 had antifungal activity against 6 phytopathogens and Nostoc linckia MACC-612 inhibited 4 fungi. Each Chlorophyta strain was only active against 1-2 fungal strains. However, the daily productivity rates of Cyanobacteria were signi cantly lower than Chlorophyta strains. Further investigation of 15 Nostocales species (Families Nostocaceae, Tolypothrichaceae and Calotrichaceae) showed the Nostoc species generally had signi cantly lower biomass generation compared to other Nostocacaeae strains. The most promising strain was Tolypothrix tenuis MACC-205 which had the most potent, broad spectrum antifungal activity as well as signi cantly higher daily biomass productivity rates. Some microalgae strains (8%) had a stimulatory effect, suggesting the potential to screen strains especially from the Klebsormidiophyceae, for stimulating activity of bene cial plant growth promoting fungi. Thus, Cyanobacteria can potentially be developed as effective agricultural tools for environmentally-friendly disease management.

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Microalgae and Cyanobacteria Role in Sustainable Agriculture: From Wastewater Treatment to Biofertilizer Production

Lutzu,

Parsaeimehr,

Ozbay

et al. 2024

Algae Mediated Bioremediation

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Antifungal properties of aqueous microalgal extracts

Cited by 13 publications

References 38 publications

Chlorella vulgaris and Tetradesmus obliquus Protect Spinach (Spinacia oleracea L.) against Fusarium oxysporum

Chlorella vulgaris and Tetradesmus obliquus Protect Spinach (Spinacia oleracea L.) against Fusarium oxysporum

Cataloguing microalgae and Cyanobacteria strains from the Mosonmagyaróvár Algal Culture Collection with in vitro antagonistic activity against phytopathogenic fungi and oomycetes

Microalgae and Cyanobacteria Role in Sustainable Agriculture: From Wastewater Treatment to Biofertilizer Production

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