Uso de Myriophyllum aquaticum para inibir o crescimento de Microcystis aeruginosa e remover microcistina-LR
DOI:
https://doi.org/10.5327/Z2176-94781309Palavras-chave:
alelopatia; cianobactérias; cianotoxinas; macrófitas aquáticas submersas; soluções baseadas na natureza.Resumo
Florações de cianoabactérias são consideradas um dos maiores desafios na preservação de fontes hídricas, especialmente quando estão presentes espécies como Microcystis aeruginosa. A descoberta de alternativas de remediação faz-se necessária, e uma delas é o uso de macrófitas aquáticas, como as espécies do gênero Myriophyllum, que apresentam atividades alelopáticas para o controle fitoplanctônico. Diante disso, este trabalho teve como objetivos avaliar a inibição do crescimento de células de M. aeruginosa em uma coexposição com Myriophyllum aquaticum e avaliar a remoção de microcistina-LR. Os experimentos foram conduzidos com cultivos de M. aeruginosa (1x106células mL-1) em coexposição com M. aquaticum por sete dias. Os efeitos inibitórios foram investigados por contagem celular. Os efeitos nos pigmentos fotossintéticos foram mensurados, além da quantificação de microcistina-LR no último dia experimental. Para avaliar possíveis efeitos de competição por nutrientes e espaço, realizou-se a quantificação da concentração de ortofosfato total e utilizou-se um tratamento com planta de plástico. Os experimentos com M. aquaticum apresentaram inibição total do crescimento de M. aeruginosa e redução significativa na concentração dos pigmentos fotossintéticos (> 98%). Além disso, foi constatada redução na concentração de microcistina-LR (79%) nos testes com macrófitas quando comparadas ao grupo controle. Não foi observada competição por espaço e nutrientes, o que demonstra que os efeitos sobre M. aeruginosa foram causados pela presença da macrófita aquática. Dessa forma, estes resultados podem demonstrar que M. aquaticum gerou a inibição no crescimento de cianobactérias por efeitos alelopáticos, além de remover a microcistina-LR das águas.
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