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All Journal Bioscientiae, Jurnal ilmu ilmu Biologi
Hasrul Satria Nur
prodi biologi ulm
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Immunology & microbiology Veterinary

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KARAKTERISASI Bacillus sp. PENGHASIL ASAM INDOL ASETAT ASAL RIZOSFER PERTANIAN PASANG SURUT DAN POTENSINYA SEBAGAI PEMACU PERTUMBUHAN PADI LOKAL Adistya Adistya; Hasrul Satria Nur; Yusriadi Yusriadi
Bioscientiae Vol 21, No 2 (2024): Bioscientiae Volume 21 No 2
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/b.v21i2.13283

Abstract

Bacillus sp., a member of the microbe, resided in the rhizosphere, potentially in plant growth promoting through a direct or indirect mechanism - phytohormone production, i.e., ethylene, gibberellin, cytokinin, and indole acetic acid.  Bacillus sp. from soil agriculture in tidal swamp lands was isolated.  Morphological, biochemical, and physiological properties have characterized attributes of isolation.  In addition, indole acetic acid production is detected using the colorimeter method with the Salkowski reagent.  The capability of the isolate to regulate plant growth promotion was carried out by detecting the performance of the paddy plant on the Yoshida medium cultivated.  Five isolates have been characterized as plant growth-promoting rhizobacteria, e.g., BML-1, KK, SLC-2, SLK, and SPBKK-1.  Furthermore, five isolates showed differences in indole acetic acid production, with or without adding tryptophane as a precursor.  Indole acetic acid production without tryptophane ranged from 0.364 – 7.046 mg.ml-1.  On the other hand, the indole acetic acid production by adding tryptophane in varied concentrations, viz 1, 2, and 5 mg.ml-1 is respectively delineated as follows 0.819 – 8.227 mg.ml-1; 1.046 – 10.727 mg.ml-1; 1.954 -18.909 mg.ml-1. Meanwhile, the inoculation of Bacillus sp. isolates improved paddy plant growth regarding yield and root fibers of paddy plants.
KARAKTERISASI SELULASE TERMOSTABIL ASAL ISOLAT BAKTERI TANAH PERTANIAN PASANG SURUT Rini Sahrida Lestari; Hasrul Satria Nur; Witiyasti Imaningsih
Bioscientiae Vol 21, No 1 (2024): Bioscientiae Volume 21 No 1
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/b.v21i1.12101

Abstract

Cellulase is an enzyme that can break up β - (1→4) glycosidic bonds of cellulose. Generally, cellulases are classified into three major groups, i.e., endoglucanase (EC 3.2.1.4), exoglucanase (EC 3.2.1 .91), and β glucosidase (EC 3.2.1.21). Meanwhile, five isolates of tidal swamp soil have been isolated; thus, in this research step, we are acquainted with cellulase activity and the characterization of cellulase enzymes on various temperatures, pH, and specific substrates. The activity of an enzyme was measured using the modified Miller and Bradford methods to detect the specific characteristics of the isolate. The results showed that five isolates namely ATP-1 BKP-5, HAMML-2, PKL-2, and SPBKK-3 have activities 0.025 nKat.ml-1, 0.032 nKat.ml-1, 0.296 nKat.ml-1, 0.114 nKat.ml-1, and 0.087 nKat.ml-1, respectively. Furthermore, cellulase from isolates ATP 1, BKP-5, and PKL 2 have an optimum activity at pH 7,0; 50 oC. The isolate HAMML-2 has an optimum activity at pH 5,0; 60 oC. SPBK 3 has an optimum activity at pH 5,0; 50 oC. All of those isolates can degrade CMC, Avicell, and Whatman paper No.1 and retain the activity relative to the temperatures 50 and 60 0C as the characteristics of the thermostable enzyme.
Co-Authors Adistya Adistya Rini Sahrida Lestari Witiyasti Imaningsih Yusriadi Yusriadi