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All Journal BIOLINK (Jurnal Biologi Lingkungan, Industri, Kesehatan) Spizaetus: Jurnal Biologi dan Pendidikan Biologi
Peristiwati Peristiwati
Universitas Pendidikan Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Immunology & microbiology Other

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VIRULENCE AND HORIZONTAL TRANSMISSION POTENTIAL OF ENTOMOPATHOGENIC FUNGI AGAINST SUBTERRANEAN TERMITES (Macrotermes gilvus) Dendu Noutera Pramayuditya Harnieyane; Peristiwati Peristiwati; Any Aryani
BIOLINK (Jurnal Biologi Lingkungan Industri Kesehatan) Vol. 12 No. 2 (2026): Biolink February
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/biolink.v12i2.15380

Abstract

Indonesia’s tropical climate provides favorable conditions for subterranean termites, particularly Macrotermes gilvus, which cause significant economic losses as wood-destroying pests. Chemical control methods may lead to resistance and environmental problems; therefore, alternative control strategies are needed. This study aimed to evaluate the virulence of Metarhizium sp., Beauveria sp., Aspergillus sp., and Penicillium sp. against M. gilvus based on termite mortality, wood weight loss, and horizontal transmission. Isolates of Metarhizium sp. and Beauveria sp. were obtained from the BSIP Lembang laboratory collection, while Aspergillus sp. and Penicillium sp. were isolated from rhizosphere soil at the same site. The experiment used 13 treatments with three replications, consisting of three conidial concentrations (10⁶, 10⁷, and 10⁸ conidia/ml) and a control. Bioassays were conducted at 26–28 °C and 70–95% relative humidity using no-choice termiticide and horizontal transmission tests. Data were analyzed using the Kruskal–Wallis test. All fungal isolates caused termite mortality and wood weight loss. Beauveria sp. at 10⁸ conidia/ml showed the highest efficacy, achieving 100% mortality within 24 hours. Horizontal transmission was indicated by white hyphal growth on termite bodies. These results demonstrate that entomopathogenic fungi, particularly Beauveria sp., are promising environmentally friendly biological control agents against M. gilvus.
Karakterisasi Isolat Bakteri Asal Tanah Tercemar Kromium Berdasarkan Identifikasi Molekuler dan Respons Pertumbuhan terhadap Cr(VI) Wahyu Surakusumah; Abelia Rahmah Oktaviani; Hertien Koosbandiah Surtikanti; Peristiwati Peristiwati; Restu Utari Dewina
Spizaetus: Jurnal Biologi dan Pendidikan Biologi Vol 7 No 3 (2026): Spizaetus: Jurnal Biologi dan Pendidikan Biologi
Publisher : Program Studi Pendidikan Biologi, FKIP, Universitas Nusa Nipa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55241/spibio.v7i3.851

Abstract

Environmental pollution caused by heavy metals such as chromium is found in various industrial activities, including the leather tanning industry. One approach to address such pollution is bioremediation using microorganisms. In its application, microorganisms must undergo detailed taxonomic identification to the species level to minimize competition among bacterial strains. This study aimed to investigate the biochemical characteristics, molecular identities, and growth responses of bacterial isolates under chromium stress. An experimental method with a descriptive quantitative design was employed. Four bacterial isolates from heavy-metal-contaminated rhizosphere soil were identified through biochemical tests, 16S rRNA gene analysis, and growth observation. Data were analyzed using the Man-Whitney U test to determine whether Cr(VI) stress significantly affected the growth of the isolates. The results identified four Bacillales isolates: Bacillus sp., Bacillus licheniformis, Bacillus paralicheniformis, and Brevibacillus borstelensis. All isolates grew at 500 ppm, while B. paralicheniformis grew at concentrations up to 1000 ppm. This study provides information on the potential of rhizosphere bacteria as bioremediation agents for chromium-contaminated environments.
Co-Authors Abelia Rahmah Oktaviani Any Aryani Dendu Noutera Pramayuditya Harnieyane Restu Utari Dewina Surtikanti Hertien Koosbandiah, Surtikanti Wahyu Surakusumah