Parâmetros de crescimento para otimização do cultivo de isolados de Bacillus thuringiensis (Berliner, 1911) no controle de Aedes aegypti (Linnaeus, 1762)
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Resumo
Objetivo: Obter os parâmetros de crescimento de linhagens de Bacillus thuringiensis ativas a Aedes aegypti. Métodos: Dezoito combinações de pH e temperaturas foram testadas para obtenção das melhores condições de crescimento para três isolados do BBENMA, BtMA-690, BtMA-750 e BtMA-1114. Para comprovação das melhores condições de crescimento foi realizada a quantificação do inóculo obtendo a concentração de esporos/mL e massa celular (g/L). As CL50 dos isolados cultivados nas condições extremas de temperatura e das duas melhores condições de crescimento foram testadas em bioensaios com de A. aegypti para confirmação de toxicidade. Resultados: Os isolados BtMA-690 e BtMA-750 demostraram melhores condições de crescimento nas combinações de 34°C com pH 8,0 para concentração de esporos/mL e 30°C com pH 6,0 para massa celular, enquanto BtMA-1114 apresentou melhor crescimento nas condições de 28°C com pH 7,0 para concentração de esporos/mL e 34°C com pH 6,0 para massa celular. Após 72 horas, BtMA-690 apresentou mortalidade de 35%, na combinação 26°C com pH 6,0, BtMA-750 acima de 90% para nove das condições testadas e BtMA-1114 com 14%, para 36°C com pH 7,0. Conclusão: A otimização do crescimento das linhagens de Bt em laboratório possibilitará melhor adequação dos parâmetros de crescimento utilizados no cultivo dos isolados.
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