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All Journal Biotropika Jurnal Sumberdaya Hayati
anggria sari, Dian
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology

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Isolasi dan Karakterisasi Bakteri Rhizobium asal Bintil Akar Tanaman Kacang Tanah (Arachis hypogaea) dan Koro Rawe (Mucuna bracteata): Isolation and Characterization of Rhizobium Bacteria from Root Nodules of Peanut Plants (Arachis hypogaea) and Koro Rawe (Mucuna bracteata) Nabilla, Alnovara Yuan; Prastya, Muhammad Eka ; anggria sari, Dian; Suryanti, Erma
Jurnal Sumberdaya Hayati Vol. 10 No. 4 (2024): 2024
Publisher : Departemen Biologi, Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jsdh.10.4.175-182

Abstract

Nitrogen (N) is naturally available in the form of N2. Nitrogen fixation can be facilitated by microbes such as Rhizobium bacteria, which can establish symbiosis with the roots of legume plants to form root nodules that perform nitrogen fixation. This study aims to determine the characteristics of Rhizobium bacteria in the root nodules of peanuts (Arachis hypogaea) and koro rawe (Mucuna bracteata). The methods used in this research include collecting root nodules, isolating Rhizobium bacteria, and identifying and characterizing these bacteria for their nitrogen fixation and phosphate solubilization capabilities. Characterization results on YEMA + Congo red media indicated that 10 out of 16 isolates from peanut root nodules and 30 out of 55 isolates from koro rawe root nodules were positive for Rhizobium bacteria. The nitrogen fixation activity test revealed that only 4 isolates from peanut root nodules and 6 from koro rawe root nodules exhibited nitrogen fixation ability in Jensen's medium. The highest phosphate solubilization index was obtained from isolate KK.5.1.1 (0.5±0.08), while the lowest was from isolate KK.5.2.2 (0.09±0.06). This research underscores the significance of Rhizobium in enhancing nitrogen availability and phosphate solubilization for legume plants.
Effect of PGPB (Plant Growth Promoting Bacteria) and NPK Fertiliser on The Growth of Tomato Plants (Solanum lycopersicum) Infected with Fusarium sp. Suryanti, Erma; Chusniasih, Dewi; Arliani Nur Anisa, Hida; Anbar Istiadi, Khaerunissa; Restiati, Nawang; Anggria Sari, Dian
Biotropika: Journal of Tropical Biology Vol. 14 No. 2 (2026)
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.biotropika.2026.014.02.01

Abstract

The long-term use of NPK fertiliser harms the environment, therefore, the use of NPK fertiliser needs to be balanced with biological fertilisers. The biological fertiliser used was PGPB (Plant Growth-Promoting Bacteria) TNAP1, TNCP1, and ANAP1 isolated from pineapple plants. This study aimed to determine the antagonistic activity of TNAP1, TNCP1, and ANAP1 isolates, assess the viability oF PGPB bacteria in the carrier material (Biochar) during storage, and evaluate the effect of NPK and PGPB fertiliser combination on the growth of tomatoes (Solanum lycopersicum) infected with Fusarium sp. This study conducted antagonism tests between PGPB isolates, PGPB antagonism with Fusarium sp. in vitro, formulation of PGPB fertiliser on the carrier material, viability test of bacteria, Fusarium sp. infection in tomato plants, fertilisation, and observation. The observed growth parameters were plant height, number of leaves, number of flowers, number of fruits, and chlorophyll content. The results of this study showed that the three bacterial isolates had synergistic properties, the viability of PGPB bacteria was above 107 CFU/g and met the requirements of the Regulation of the Ministry of Agriculture No. 70 of 2011, and the P2 treatment with a combination of fertilisers (50% NPK + 50% PGPB) gave the best results for all growth parameters and did not differ significantly from the positive control.
Co-Authors Anbar Istiadi, Khaerunissa Arliani Nur Anisa, Hida Dewi Chusniasih Nabilla, Alnovara Yuan Prastya, Muhammad Eka  Restiati, Nawang Suryanti, Erma