Investigation the Effect of Exposure Aspergillus niger Isolate to the UV Radiation on Its Superphosphate Fertilizer Dissolving Efficiency in Calcareous Soil

Authors

  • Zainab K. Hasan

    Department of Soil Science and Water Resources, College of Agriculture, University of Basrah, Basrah 61004, Iraq

  • Nawal I. Ashwer

    Department of Soil Science and Water Resources, College of Agriculture, University of Basrah, Basrah 61004, Iraq

  • Hasan N. Habib

    Department of Soil Science and Water Resources, College of Agriculture, University of Basrah, Basrah 61004, Iraq

DOI:

https://doi.org/10.30564/jees.v7i1.7331
Received: 21 September 2024 | Revised: 8 October 2024 | Accepted: 10 October 2024 | Published Online: 28 November 2024

Abstract

A laboratory experiment was conducted to demonstrate the importance of improving the efficiency of six isolates of Aspergillus niger fungi. Four isolates were exposed to UV-rays radiation at a distance of 30 cm, a wavelength of 254–255 nm  during M15, M30, and M45 minutes. Exposure periods, both of wild (no UV-rays exposure) and no A.niger (C) as controls, all six isolates were identified molecularly by polymerase chain reaction technique extracted DNA of A. niger was analyzed to ensure gene completion through multiple sequence alignment by bioinformatic programs to study the improvement of dissolving efficiency of mutant and wild A. niger. They were incubated after  the addition of  superphosphate fertilizer (47% P2O5) at 90 mg P kg1 applied to soil with controls( no A. niger or no superphosphate) for I, II, III, and IV weeks of incubation periods at 28 ± 1 °C. In addition, the  DNA extraction and purification by NanoDrop of Thermo Scientific-200 A280/A260 ratio was 2.01 and confirmed that the sequences of nitrogenous bases by the method of multiple sequence alignment (MSA) as compared to the reference sequence of A. niger recorded in the gene bank under the accession number LC632396. Results proved that the M30 minutes exposure UV-rays radiation period was the superior dose when mutant Aspergillus niger obtained the highest amount of dissolved phosphate, reducing soil-pH with maximum biomass of A. niger during the M30 isolate during the third  week (III).

Keywords:

A. niger; Mutation; PCR; UV-Rays Radiation

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How to Cite

Zainab K. Hasan, Nawal I. Ashwer, & Hasan N. Habib. (2025). Investigation the Effect of Exposure Aspergillus niger Isolate to the UV Radiation on Its Superphosphate Fertilizer Dissolving Efficiency in Calcareous Soil. Journal of Environmental & Earth Sciences, 7(1), 205–213. https://doi.org/10.30564/jees.v7i1.7331