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All Journal Biology, Medicine, & Natural Product Chemistry Indonesian Journal of Applied Research (IJAR)
Fitria, Karomah Indah
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Computer Science & IT Medicine & Pharmacology Public Health

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Isolation and Antagonistic Activity of Actinomycetes Associated with Strawberry Plants (Fragaria x ananassa Duch.) Against Colletotrichum acutatum Simmonds Aji, Oktira Roka; Aisyah, Iis Nisya Nur; Fitria, Karomah Indah
Indonesian Journal of Applied Research (IJAR) Vol. 5 No. 3 (2024): Indonesian Journal of Applied Research (IJAR)
Publisher : Universitas Djuanda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30997/ijar.v5i3.519

Abstract

Strawberries (Fragaria x ananassa Duch.) are a valuable horticultural crop in Indonesia, but their productivity is threatened by anthracnose disease caused by Colletotrichum acutatum Simmonds. Traditional control methods often involved synthetic fungicides, which posed risks of pesticide residues and environmental harm. This study investigated Actinomycetes isolated from various strawberry plant organs and their rhizosphere as potential biological control agents. The isolation processes included the collection of Actinomycetes from strawberry plant organs and the rhizosphere, along with the regeneration of C. acutatum. The isolates were identified through observations of their morphological characteristics. Screening of antagonistic activity was performed using dual-culture assays. Over 10 Gram-positive Actinomycetes strains were successfully isolated and characterized. Two isolates exhibited the highest antagonistic activity against C. acutatum, with inhibition percentages of 67.17% and 55.80%, respectively. Data analysis revealed that these isolates demonstrated significant biocontrol potential through mechanisms such as competition and antibiosis. The results suggested that Actinomycetes could serve as effective, eco-friendly alternatives to chemical pesticides in strawberry cultivation. Future research should focus on optimizing these strains for broader agricultural applications.
Antimicrobial Properties of Endophytic Fungal Culture Filtrates from Tinospora crispa Aji, Oktira Roka; Fitria, Karomah Indah; Vianingtyas, Naresh Wari Mega; Wicaksono, Adelyanty Pangestuty
Biology, Medicine, & Natural Product Chemistry Vol 14, No 2 (2025)
Publisher : Sunan Kalijaga State Islamic University & Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14421/biomedich.2025.142.635-640

Abstract

Endophytic fungi can produce bioactive compounds that are useful as antimicrobials. This study evaluates the antimicrobial potential of culture filtrate extracts derived from endophytic fungi isolated from the medicinal plant Tinospora crispa. Isolation was carried out from the roots, leaves, and stems of T. crispa, which were then identified based on the ITS gene. The culture filtrate was extracted using ethyl acetate and assessed for antimicrobial activity using the disc diffusion method against Escherichia coli, Staphylococcus aureus, and Candida albicans. A total of 3 endophytic fungal isolates were isolated and identified as Acrocalymma vagum, Diaporthe tulliensis, and Colletotrichum truncatum. The results showed that all culture filtrate extracts of the fungal endophyte isolates exhibited varying antimicrobial activity, with the highest antibacterial activity demonstrated by C. truncatum isolates against Escherichia coli and Staphylococcus aureus. The most significant anticandida activity was by D. tulliensis isolates. Endophytic fungi of medicinal plant T. crispa can be developed as a source of antimicrobial agents, especially to overcome the increasing antibiotics resistance.
Co-Authors Aisyah, Iis Nisya Nur Oktira Roka Aji Vianingtyas, Naresh Wari Mega Wicaksono, Adelyanty Pangestuty