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HASAN, ANI M.
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Actinomycetes from Plant Rhizosphere in Gorontalo Karst Area as Plant Growth Promoting Rhizobacteria Matalauni, Citra Leonita; Retnowati, Yuliana; Katili, Abubakar Sidik; Kandowangko, Novri Youla; Hasan, Ani M.
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.2025.142.1047-1053

Abstract

This study aimed to describe Actinomycetes from the rhizosphere of plants in the Gorontalo karst area as Plant Growth Promoting Rhizobacteria (PGPR). The research method is based on a quantitative descriptive method. Soil samples from the rhizosphere were collected using a purposive sampling technique from 8 plant species at two locations in the Gorontalo karst region, namely the Tanjung Kramat Hills. The characteristics of PGPR in this study focused on phosphate solubilization ability, Indole Acetic Acid (IAA) production, antagonism against the fungus Fusarium oxysporum, and tolerance to fungicides. Potential PGPR isolates were analyzed for phylogenetic relationships based on 16S rRNA gene sequences. The results showed that there were 6 actinomycetes isolates (RzHKC-01, RzKO-02, RzO-03, RzAK-04, RzPK-05, and RzOC-06) from 8 plant species in the Gorontalo karst region. One actinomycetes isolate, RzPK-05, showed potential as a PGPR with the ability to solubilize phosphate and produce IAA at 0.165 mg/L and 0.133 mg/L, respectively. Isolate RzPK-05 exhibited antagonistic properties against Fusarium oxysporum with an inhibition rate of 82.24% and was tolerant to fungicides such as Captive, Benlate, and Thiramo up to a concentration of 100 mg/L. Molecular analysis based on the 16S rRNA gene and phylogenetic tree reconstruction indicated that the RzPK-05 isolate is closely related to the genus Streptomyces with 100% similarity.
Co-Authors Abubakar Sidik Katili Elya Nusantari Frida Maryati Yusuf Hamidun, Marini S. Herinda Mardin Ismail, Lilis U. Jusna Ahmad Kartika, Dika Lamangida, Novi Safitri Lilan Dama Mabuia, Siti Ainun Mamu, Hartono Margaretha Solang Masra Latjompoh Matalauni, Citra Leonita Moha, Siti Nurliana Muh. Nur Akbar Mursali, Putri Regina Mustamin Ibrahim Novri Youla Kandowangko Nurain, Saleh Pobela, Juliani Renowati, Yuliana Rinaldi Rinaldi Syam S. Kumaji Uno, Wirnangsi D. Uno, Wirnangsih Din Wirnangsih D. Uno Yuliana Retnowati Yusuf, Septia