Growth and antioxidant response of Microcystis aeruginosa (Cyanobacteria) exposed to anatoxin-a

Autor(es)

Chia, Mathias Ahii ^[1] ; Cordeiro-Araujo, Micheline Kezia ^{[1, 2]} ; Bittencourt-Oliveira, Maria do Carmo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Biol Sci, Luiz de Queiroz Coll Agr, BR-13418900 Piracicaba, SP - Brazil

^[2] Rural & Fed Univ Pernambuco, Bot Grad Program, BR-52171030 Recife, PE - Brazil

• Tipo de documento: Artigo Científico
• Fonte: HARMFUL ALGAE; v. 49, p. 135-146, NOV 2015.
• Citações Web of Science: 6

Resumo

Changing global climatic conditions are expected to stimulate excessive proliferation of toxic and nontoxic cyanobacteria. Under these changing conditions, toxin production by different toxic cyanobacteria may increase. However, the effects of most of these cyanotoxins including anatoxin-a (ATX) on the growth and physiological response of phytoplankton species have been poorly investigated. The present study investigated the effect of ATX at environmentally relevant concentrations (5, 10, 25 and 50 mu g L-1) on Microcystis aeruginosa (Kiltzing) Kfitzing. Cell density of M. aeruginosa did not significantly vary between the different ATX concentrations, while chlorophyll a content decreased. Total proteins and total microcystins (MCs) content declined in cells exposed to increasing ATX concentrations, while antioxidant enzyme (catalase, peroxidase, superoxide dismutase and glutathione S-transferase) activities were significantly increased under the same conditions. Furthermore, internal hydrogen peroxide (H2O2) formation increased as ATX concentrations were increased. Significant positive correlations were observed between antioxidant enzyme activities, hydrogen peroxide production and ATX concentrations. The lack of significant growth inhibition by ATX may partly explain the co-occurrence, and sometimes formation of multispecies cyanobacterial blooms by MCs and ATX producing genera. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 13/11306-3 - Efeitos de anatoxina-a e cilindrospermopsina em diferentes concentrações de nitrogênio e irradiância na fisiologia de Microcystis aeruginosa (Cyanobacteria)e Scenedesmus acuminatus (Chlorophyta)
• Beneficiário: Mathias Ahii Chia
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 14/26898-6 - Revelando alguns processos fisiológicos e moleculares envolvidos nas interações alelopáticas entre fitoplâncton tóxico e não-tóxicos
• Beneficiário: Mathias Ahii Chia
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 14/01934-0 - Investigação de bioacumulação e desintoxicação de toxinas de cianobactérias (microcistinas e cilindrospermopsina) em alface e rúcula
• Beneficiário: Maria Do Carmo Bittencourt de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular