ISOLATION AND CHARACTERIZATION OF A MOLYBDENUM-REDUCING AND GLYPHOSATE-DEGRADING Klebsiella oxytoca STRAIN SAW-5 IN SOILS FROM SARAWAK

AGRIVITA, Journal of Agricultural Science

M.K. Sabullah³  S.A. Ahmad⁴  N.A. Shamaan²  M.F. Rahman⁴  M.S. Shukor¹  M.Y. Shukor⁴  M.R. Sulaiman⁵ 

[1] Snoc International Sdn Bhd, Lot 343, Jalan 7/16 Kawasan Perindustrian Nilai 7, Inland Port, 71800, Negeri Sembilan, Malaysia$$;Faculty of Medicine and Health Sciences, Islamic Science University of Malaysia,55100 Kuala Lumpur, Malaysia$$;Faculty of Science and Natural Resources, Universiti Malaysia Sabah,88400 Kota Kinabalu, Sabah, Malaysia$$;Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia,UPM 43400 Serdang, Selangor, Malaysia$$;School of Food Science and Nutrition, Universiti Malaysia Sabah, Malaysia$$

关键词: bioreduction;    glyphosate;    Klebsiella oxytoca;    molybdenum blue;    molybdenum-reducing bacterium;   

DOI  :  10.17503/agrivita.v38i1.654

学科分类：农业科学（综合）

来源: Universitas Brawijaya * Fakultas Pertanian / Brawijaya University, Faculty of Agriculture

【 摘 要 】

Bioremediation of pollutants including heavy metals and xenobiotics is an economic and environmentally friendly process. A novel molyb-denum-reducing bacterium with the ability to utilize the pesticide glyphosate as a carbon source is reported. The characterization works were carried out utilizing bacterial resting cells in a microplate format. The bacterium reduces molybdate to Mo-blue optimally between pH 6.3 and 6.8 and at 34 o C. Glucose was the best elec-tron donor for supporting molybdate reduction followed by lactose, maltose, melibiose, raffinose, d-mannitol, d-xylose, l-rhamnose, l-arabinose, dulcitol, myo-inositol and glycerol in descending order. Other requirements include a phosphate concentration at 5.0 mM and a molybdate concentration between 20 and 30 mM. The molybdenum blue exhibited an absorption spec-trum resembling a reduced phospho-molybdate. Molybdenum reduction was inhibited by mercury, silver, cadmium and copper at 2 ppm by 45.5, 26.0, 18.5 and 16.3%, respectively. Biochemical analysis identified the bacterium as Klebsiella oxytoca strain Saw-5. To conclude, the capacity of this bacterium to reduce molybdenum into a less toxic form and to grow on glyphosate is novel and makes the bacterium an important instrument for bioremediation of these pollutants.

【 授权许可】

Unknown