Development of a low-cost medium for the culture of Bacillus thuringiensis subsp. israelensis
DOI:
https://doi.org/10.5433/1679-0367.2012v33n2p161Keywords:
Bacillus thuringiensis israelensis, Bioinsecticide, Insect control, Bombyx mori, AedesAbstract
Bacillus thuringiensis is a Gram-positive spore-forming bacterium that produces a parasporal crystal toxic for many insects. The aim of this study was the development of a low-cost medium for the culture of B. thuringiensis subsp. israelensis HD 537 to be used in a local insect control program in Brazil. In this study, the evaluated parameters were bacterial growth and toxicity of the cultures against Aedes aegypti larvae. The first strategy analised was the effect of salts, glucose, and yeast hydrolizate concentrations in a modified Arcas medium. The maximum toxicity in the bioassays (LC50 2.31 mg.l-1) were obtained by using a medium showing the highest tested concentrations of nitrogen sources and salts (8.00 e 0.47 g.l-1, respectively). In the second strategy was used a medium based in a ground Bombyx mori pupae. The maximum toxicity (LC 50 3.64 mg.l-1) was obtained with Bm 100 medium, with 100 g.l-1 of ground B. mori pupae. Beyond of the significant media differences in LC50 values, Bm100 medium was 120 times less expensive than the best Arcas modified medium. Thus, these results confirm the viability of ground B. mori pupae for B. thuringiensis subsp. israelensis growth and crystal production.
Downloads
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2012 Semina: Ciências Biológicas e da Saúde
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
adopts the CC-BY-NC license for its publications, the copyright being held by the author, in cases of republication we recommend that authors indicate first publication in this journal.
This license allows you to copy and redistribute the material in any medium or format, remix, transform and develop the material, as long as it is not for commercial purposes. And due credit must be given to the creator.
The opinions expressed by the authors of the articles are their sole responsibility.
The magazine reserves the right to make normative, orthographic and grammatical changes to the originals in order to maintain the cultured standard of the language and the credibility of the vehicle. However, it will respect the writing style of the authors. Changes, corrections or suggestions of a conceptual nature will be sent to the authors when necessary.
This Journal is licensed with a license Creative Commons Assignment-NonCommercial 4.0 International.