Improvement of Chitinase Production by Bacillus thuringiensis NM101-19 for Antifungal Biocontrol through Physical Mutation View Full Text


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Article Info

DATE

2018-07

AUTHORS

E. Z. Gomaa, O. M. El-Mahdy

ABSTRACT

Chitinase is one of the most important enzymes due to its diversity and a variety of potential uses. This study is an attempt to enhance chitinase production for antifungal biocontrol by subjecting Bacillus thuringiensis NM101-19 strain grown on shrimp shell wastes to various doses of gamma irradiation. Six mutants (BM-4, BM-6, BM-8, BM-12, BM-15, and BM-17) obtained at gamma ray doses of 40, 60, 80, 100, 120 and 140 Gy, respectively produced higher levels of chitinolytic activities in comparision to the wild-type strain. The BM-15 mutant strain showed the highest chitinase production (65.41 U/mL) which was 2.60 times more than the wild type (25.11 U/mL). Biocontrol efficacy of the mutants was statistically superior to the wild-type strain against all tested phytopathogens. Random amplified polymorphic DNA (RAPD) and inter simple sequence repeat (ISSR) PCR techniques, with five primers for each, were used in order to detect the variation in DNA profile between the mutant and wild-type strains in response to gamma-radiation treatments. RAPD and ISSR analysis indicated the appearance and disappearance of DNA polymorphic bands at different gamma ray doses. The results confirmed that the mutagenesis technique is a potent strategy to enhance the chitinase activity for industrial and agricultural purposes. More... »

PAGES

472-485

References to SciGraph publications

  • 2006-09. Purification and Characterization of Two Types of Chitosanase from a Microbacterium sp. in BIOTECHNOLOGY LETTERS
  • 2009-06. Purification and Characterization of Protease and Chitinase from Bacillus cereus TKU006 and Conversion of Marine Wastes by These Enzymes in JOURNAL OF MARINE BIOTECHNOLOGY
  • 2007-03. Isolation and characterization of mutants of Pseudomonas maltophila PM-4 altered in chitinolytic activity and antagonistic activity against root rot pathogens of clusterbean (Cyamopsis tetragonoloba) in INDIAN JOURNAL OF MICROBIOLOGY
  • 2012-02. Chitinase production by Bacillus thuringiensis and Bacillus licheniformis: Their potential in antifungal biocontrol in JOURNAL OF MICROBIOLOGY
  • 2010-05. An antifungal chitinase produced by Bacillus subtilis using chitin waste as a carbon source in WORLD JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY
  • 2008-05. Molecular and Biochemical Characterization of an Endochitinase (ChiA-HD73) from Bacillus thuringiensis subsp. kurstaki HD-73 in MOLECULAR BIOTECHNOLOGY
  • 2017-12. Transglycosylation by a chitinase from Enterobacter cloacae subsp. cloacae generates longer chitin oligosaccharides in SCIENTIFIC REPORTS
  • 2013-10. Molecular Characterization of Chitinase Genes from a Local Isolate of Serratia marcescens and Their Contribution to the Insecticidal Activity of Bacillus thuringiensis Strains in CURRENT MICROBIOLOGY
  • 2012-01. Fungal chitinases: diversity, mechanistic properties and biotechnological potential in APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
  • 2017-12. Production and characterization of a novel antifungal chitinase identified by functional screening of a suppressive-soil metagenome in MICROBIAL CELL FACTORIES
  • Journal

    TITLE

    Microbiology

    ISSUE

    4

    VOLUME

    87

    Author Affiliations

    Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1134/s0026261718040094

    DOI

    http://dx.doi.org/10.1134/s0026261718040094

    DIMENSIONS

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