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Improvement of Sporulation Conditions of a New Strain of Bacillus amyloliquefaciens in Liquid Fermentation

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DOI: 10.4236/abb.2015.64029    3,861 Downloads   4,729 Views   Citations

ABSTRACT

The desirable active ingredients for the development of bioproducts based in Bacillus sp. for the control of soil pathogens are the spores because these structures exhibit more resistance and stability to conditions present during the fermentation, formulation, and storage processes. To improve the sporulation of a native strain of Bacillus amyloliquefaciens (Bs006) using liquid fermentation, some modifications in the concentrations of the components in a previously standardized culture media were made. Subsequently, five sporulation inducers (iron nitrate, mixture of salts, peroxide hydrogen, temperature, and initial cell concentration) were evaluated. The treatment with a mixture of salts in combination with an initial cell concentration of 1 × 108 cells/ml was selected because a final spore concentration of 1.05 × 1010 spores/ml after 66 hours with a fully substrate consumption and sporulation efficiency of 88.7% was obtained. To demonstrate the biological activity of B. amyloliquefaciens Bs006 in Cape gooseberry seedlings, a greenhouse bioassay was conducted, and statistical differences in plant growth-promoting parameters compared with previous media were not found. Additionally, the proposed modified media (coded as JM) presented a benefit-cost ratio 2.65 times higher compared with the baseline media.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Díaz-García, A. , García-Riaño, J. and Zapata-Narvaez, J. (2015) Improvement of Sporulation Conditions of a New Strain of Bacillus amyloliquefaciens in Liquid Fermentation. Advances in Bioscience and Biotechnology, 6, 302-310. doi: 10.4236/abb.2015.64029.

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