Bacillus thuringiensis var. aizawai HD-137 as a Potential Agent for Biological Control

  • Ahmed A.M. Yassein Genetics Department, Faculty of Agriculture, Fayoum University, Fayoum, Egypt.
  • Samia A. Abdal-Aziz City of Scientific Research and Technology Applications, Genetic Engineering and Biotechnology Research Institute, Nucleic Acids Research Department, Alexandria, Egypt.
Keywords: Bacillus thuringiensis HD-137, Chitinase, Antagonism, Phylogenetic

Abstract

Four strains of Bacillus thuringiensis were screened for their chitinolytic activity on colloidal chitin. B. thuringiensis var. aizawai HD-137 with the GenBank accession number HM173355 showed the highest chitinase activity, which was recorded after 2 days of incubation. The optimum condition for high chitinase production was Nutrient Yeast extract, Salt Medium, NYSM, with 0.2% colloidal chitin, two days of incubation, pH 6 and 30°C. The novel strain B. thuringiensis var. aizawai HD-137 is also considered as a powerful phytopathogenic control agent in which it showed inhibition of the mycelial growth of some phytopathogenic fungi, Alternaria solani, Rhizopus B1 and B2, Fusarium solani and Aspergillus flavus. The clear zones of mycelial inhibition ranged from 12 to 19mm. The partial nucleotides sequence of chitinase gene from B. thuringiensis var. aizawai HD-137 showed similarities to the chitinase producing bacteria in the GenBank, and it was more related to B. thuringiensis (AB699714, GQ921840 and GQ921842) and B. ehimensis chi60 (AB110081). It is obvious that the B. thuringiensis var. aizawai HD-137 is considered as a significant biocontrol agent against phytopathogenic fungi.

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Author Biography

Samia A. Abdal-Aziz, City of Scientific Research and Technology Applications, Genetic Engineering and Biotechnology Research Institute, Nucleic Acids Research Department, Alexandria, Egypt.

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Published
2014-01-01
How to Cite
Yassein, A., & Abdal-Aziz, S. (2014). Bacillus thuringiensis var. aizawai HD-137 as a Potential Agent for Biological Control. Journal of Advanced Laboratory Research in Biology, 5(1), 1-6. Retrieved from https://e-journal.sospublication.co.in/index.php/jalrb/article/view/177
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