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Native Biocrust Cyanobacteria Strains Showing Antagonism against Three Soilborne Pathogenic Fungi
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Native Biocrust Cyanobacteria Strains Showing Antagonism against Three Soilborne Pathogenic Fungi
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Journal Article
Native Biocrust Cyanobacteria Strains Showing Antagonism against Three Soilborne Pathogenic Fungi
2024
Overview
The biocontrol potential of three native soil cyanobacteria from biological soil crusts (Nostoc commune, Scytonema hyalinum, and Tolypothrix distorta) was tested by means of in vitro mycelial growth inhibition assays for eighteen cyanobacteria-based products against three phytopathogenic soilborne fungi (Phytophthora capsici, Pythium aphanidermatum, and Fusarium oxysporum f. sp. radicis-cucumerinum). Three cyanobacteria-based production factors were considered: (i) cyanobacterium strain, (ii) cyanobacterial culture growth phase, and (iii) different post-harvest treatments: raw cultures, cyanobacterial filtrates, and cyanobacterial extracts. Results showed that any of the factors considered are key points for successfully inhibiting fungal growth. N. commune showed the highest growth inhibition rates for the three phytopathogens; stationary phase treatments produced higher inhibition percentages than logarithmic ones; and all the post-harvest treatments of N. commune at the stationary phase inhibited the growth of P. capsici, up to 77.7%. Thus, N. commune products were tested in planta against P. capsici, but none of the products showed efficacy in delaying the onset nor reducing the damage due to P. capsici, demonstrating the complexity of the in planta assay’s success and encouraging further research to design an appropriate scaling up methodology.
Publisher
MDPI AG
Subject
/ Crops
/ Crusts
/ Cyanobacteria - growth & development
/ Fungi
/ Fungi - growth & development
/ Fusarium - growth & development
/ Fusarium oxysporum f. sp. radicis-cucumerinum
/ mycelium
/ Nostoc
/ Plant Diseases - microbiology
/ Plant Diseases - prevention & control
/ Pythium - growth & development
/ Seeds
