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All Journal Biodiversitas Journal of Biological Diversity
HERY SUWITO
Department of Chemistry, Faculty of Science and Technology, Universitas Airlangga. Jl. Dr. Ir. H. Soekarno, Surabaya 60115, East Java, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Potential of antimicrobial-producing endophytic bacteria from Balikpapan endemic ginger (Etlingera balikpapanensis A.D. Poulsen) FATIMAH FATIMAH; LILLAH ASRITAFRIHA; SYARIFAH SALSABILA; ERNA KRISTIANA DEWI; NI’MATUZAHROH NI’MATUZAHROH; ALMANDO GERALDI; RICO RAMADHAN; HERY SUWITO; ARRIZAL RAHMAN; LUKMAN RIYADI
Biodiversitas Journal of Biological Diversity Vol. 25 No. 9 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d250922

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Abstract. Fatimah, Asritafriha L, Salsabila S, Dewi EK, Ni’matuzahroh, Geraldi A, Ramadhan R, Suwito H, Rahman A, Riyadi L. 2024. Potential of antimicrobial-producing endophytic bacteria from Balikpapan endemic ginger (Etlingera balikpapanensis A.D. Poulsen). Biodiversitas 25: 3005-3013. Etlingera balikpapanensis A.D. Poulsen is a new species of the Zingiberaceae family, which was discovered as an endemic species in the Balikpapan, Kalimantan. This study aimed to isolate endophytic bacteria from endemic Balikpapan ginger (E. balikpapanensis) and evaluate its antimicrobial activity against Escherichia coli, Staphylococcus aureus, and Candida albicans and to identify the most promising antimicrobial isolates. Plant samples include roots, stems, and leaves. The process of isolating bacteria from various plant parts, such as roots, stems, and leaves, involved repeated subculturing until pure isolates were obtained. Seven pure isolates were successfully obtained, coded as 6D, 5R, 2R, 3D1, 10D, 4R2, and 2D. Macroscopic, microscopic, and biochemical characterization of the seven isolates was carried out. The seven endophytic bacteria had varied macroscopic characteristics and were Gram-positive. The disc diffusion method was used to determine the ability of isolates to produce antimicrobial agents. The isolates showed antibacterial activity against E. coli and S. aureus. Isolates 3D1 and 5R showed the highest antibacterial activity against E. coli (8.20±0.47 mm and 8.57±0.08 mm), and 5R also showed the highest antibacterial activity against S. aureus (8.14±0.49 mm). These results demonstrate the potential of these isolates as effective antimicrobial agents. The 16S rRNA gene analysis revealed that isolate 3D1 was identified as Bacillus cereus strain PJA4.2 and isolate 5R as Micrococcus luteus strain SGAir0127 with similarity of 99.55% and 100%, respectively.
Exploring the bacteriome of Etlingera balikpapanensis for potential biofertilizer development and conservation strategies ALMANDO GERALDI; FATIMAH FATIMAH; RICO RAMADHAN; NI’MATUZAHROH NI’MATUZAHROH; HERY SUWITO; NABILLA HAPSARI WIJAYA; YANA ZAINADA VIRDAUS; RICA HANIM FADHILAH; ARRIZAL RAHMAN; LUKMAN RIYADI
Biodiversitas Journal of Biological Diversity Vol. 26 No. 5 (2025)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d260550

Abstract

Abstract. Geraldi A, Fatimah, Ramadhan R, Ni’matuzahroh, Suwito H, Wijaya NH, Virdaus YZ, Fadhilah RH, Rahman A, Riyadi L. 2025. Exploring the bacteriome of Etlingera balikpapanensis for potential biofertilizer development and conservation strategies. Biodiversitas 26: 2548-2555. Etlingera balikpapanensis, an endangered and endemic plant species from the rainforests of East Kalimantan, Indonesia, faces significant threats due to habitat loss and environmental changes. Conservation strategies for this species are limited, and there is an urgent need for innovative approaches to enhance its survival, particularly in ex-situ environments. One promising avenue is the development of biofertilizers derived from beneficial microbial communities. These Plant Growth-Promoting Bacteria (PGPB), which exist in both endophytic and rhizospheric environments, can improve nutrient uptake, enhance stress tolerance, and protect against pathogens. We used high-throughput 16S rRNA gene sequencing to characterize the endophytic and rhizospheric bacterial communities associated with E. balikpapanensis. We identified 1,183 Operational Taxonomic Units (OTUs) from plant tissues and soil samples. Among these, we found bacterial species known for their plant growth-promoting properties, including Pantoea dispersa and Kluyvera intermedia in plant tissues, as well as Burkholderia pyrrocinia, and Bradyrhizobium elkanii in soil samples. These potential microbes, with their proven plant growth-promoting properties, offer hope for the conservation of E. balikpapanensis. They can be used in biofertilizer formulation that could support the species' survival by improving its resilience to environmental stresses. The identification of such microbial communities offers a foundation for developing sustainable conservation practices that leverage natural symbiotic relationships. Future efforts should focus on isolating and characterizing these bacterial strains for experimental biofertilizer applications, aiming not only to enhance the growth of E. balikpapanensis, but also to aid the conservation of other endangered species within the Zingiberaceae family.
Co-Authors ALMANDO GERALDI ALMANDO GERALDI ARRIZAL RAHMAN ARRIZAL RAHMAN ERNA KRISTIANA DEWI FATIMAH FATIMAH FATIMAH FATIMAH LILLAH ASRITAFRIHA LUKMAN RIYADI LUKMAN RIYADI NABILLA HAPSARI WIJAYA NI’MATUZAHROH NI’MATUZAHROH NI’MATUZAHROH NI’MATUZAHROH RICA HANIM FADHILAH RICO RAMADHAN RICO RAMADHAN SYARIFAH SALSABILA YANA ZAINADA VIRDAUS