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All Journal Biodiversitas Journal of Biological Diversity
SHARON ROSE TABUGO
Department of Biological Sciences, Mindanao State University-Iligan Institute of Technology. Iligan City, 9200 Philippines
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Identification of culture-dependent microbes from mangroves reveals dominance of Bacillus including medically important species based on DNA signature RANDE DECHAVEZ; MA. LYN CALUB; DONA ROSE GENOBATA; RAUL BALACUIT; REIZL JOSE; SHARON ROSE TABUGO
Biodiversitas Journal of Biological Diversity Vol. 23 No. 10 (2022)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d231044

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Abstract. Dechavez R, Calub ML, Genobata DR, Balacuit R, Jose R, Tabugo SR. 2022. Identification of culture-dependent microbes from mangroves reveals dominance of Bacillus including medically important species based on DNA signature. Biodiversitas 23: 5342-5350. Mangroves are among the most crucial plant hosts in the marine environment because of their notable role in the ecosystem and their benefits. Identification of plant-associated and culture-dependent microbes is key to having a rich reservoir of bioactive substances. DNA barcoding was done based on 16S rRNA gene and ITS region. In this study, seven (7) mangrove species were identified as hosts. Results show that most bacterial isolates from plant leaves were gram-positive bacteria belonging to phylum: Firmicutes and genus Bacillus. Phylogenetic inference reveals a diverse non-monophyletic group with medically and economically necessary species. Among the host plants, Sonneratia alba harbored the most species of bacteria and fungi. These include two medically important strains of B. cereus and B. thuringiensis and host-specific bacteria like B. altitudinis in S. alba, B. velezensis in Rhizophora apiculata, B. clausii in Avicennia marina and B. firmus in A. marina were revealed. Meanwhile, some bacteria like B. subtilis and B. megaterium were found in three host species and B. cereus was the most abundant being recorded in four host plants. Diverse strains of fungi, Aspergillus sp., A. nomiae, A. tubingensis and A. niger were also present. This study served as baseline data for future research on diversity and host ecology for possible drug discovery.
Antifungal activity of selected sea cucumber species from Tukuran, Zamboanga del Sur, Mindanao, Philippines using modified SPOTi assay MARY GRACE EREGUERO; MARY ANNE CORDERO; RODELYN DALAYAP; SHARON ROSE TABUGO
Biodiversitas Journal of Biological Diversity Vol. 23 No. 11 (2022)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d231160

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Abstract. Ereguero MG, Cordero MA, Dalayap R, Tabugo SR. 2022. Antifungal activity of selected sea cucumber species from Tukuran, Zamboanga del Sur, Mindanao, Philippines using modified SPOTi assay. Biodiversitas 23: 6049-6055. Marine organisms have become essential candidates for discovering novel compounds that can be medically and commercially important. They are believed to yield novel compounds with unique chemical structures and significant biological activities since they managed to survive a milieu of pathogenic microorganisms and essential predators. The quest against fungal infections has been challenging due to acquired resistance to commercially available drugs hence, novel sources to treat infectious diseases caused by fungi have been investigated. Sea cucumbers have been recognized in Asian countries as a rich food source. Apart from that, they have also been studied for their medicinal properties. This study aimed to evaluate the antifungal activity of the selected sea cucumber species found in Brgy. Sugod, Tukuran, Zamboanga del Sur, Mindanao, Philippines using the modified SPOTi assay. Methanol: ethyl acetate crude extracts of Holothuria scabra, Stichopus sp., and Holothuria atra were tested for their antifungal activity against Aspergillus niger and Candida tropicalis. A 96-well plate assay was used, and the growth of fungi was assessed visually for up to 72hrs. The concentration resulting in ‘no fungal growth’ was observed and taken as the Minimum Inhibitory Concentration (MIC) value. The average MIC was calculated. Results showed that sea cucumber crude extracts have MIC values of 0.0333-0.1 mg/mL. Tukey’s posthoc test confirmed that the antifungal activity of the sea cucumber extracts was comparable to the positive control Fluconazole (p>0.05). The present study revealed a potentially effective natural antifungal agent from sea cucumbers.
High-throughput analysis using 16S rRNA sequencing of bacterial communities associated in selected mangrove species from Bayug Island, Iligan City, Philippines STEFENIE KATRIN V. SIBLOS; SHARON ROSE TABUGO
Biodiversitas Journal of Biological Diversity Vol. 25 No. 1 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d250107

Abstract

Abstract. Siblos SKV, Tabugo SR. 2023. High-throughput analysis using 16S rRNA sequencing of bacterial communities associated in selected mangrove species from Bayug Island, Iligan City, Philippines. Biodiversitas 25: 53-61. Mangrove ecosystems are recognized globally as highly productive ecosystems, that play a crucial role in carbon sequestration, erosion control, water purification, and as essential breeding grounds for diverse aquatic life. They also offer specialized ecological niches, accommodating a diverse range of organisms, including bacterial communities. This study aimed to investigate bacterial communities of Bayug Island in Iligan City, Philippines, inhabiting six mangrove species, namely Rhizophora stylosa Griffith, Rhizophora apiculata Blume, Rhizophora mucronata Lam., Sonneratia alba Sm., Ceriops tagal (Perr.) C.B.Rob., and Nypa fruticans Wurmb and their possible functions within the mangrove forests. Genomic DNA was extracted from the six pooled soil samples, and the V3-V4 region of the 16S rRNA gene was sequenced using the Illumina MiSeq platform. Six amplicon libraries, corresponding to the mangrove species were analyzed with Parallel Meta Suite software, yielding 173,270 amplicon sequence variants (ASVs) after quality control. The study identified the top five most abundant ASVs in the mangrove rhizosphere, linked to the genera Vibrio, Stenotrophomonas, Serratia, Pseudoalteromonas, and Achromobacter. Among the mangrove species, S. alba exhibited higher alpha diversity according to the Shannon index. PICRUSt analysis revealed that microorganisms are involved in biodegradation, xenobiotic metabolism, and other metabolic processes within the mangroves. These bacteria could find applications in environmental cleanup, bioremediation, waste treatment, and soil health improvement. This result contributes to the ongoing ecological restoration of mangrove forests at the research site.
Co-Authors DONA ROSE GENOBATA MA. LYN CALUB MARY ANNE CORDERO MARY GRACE EREGUERO RANDE DECHAVEZ RAUL BALACUIT REIZL JOSE RODELYN DALAYAP STEFENIE KATRIN V. SIBLOS