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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Chia, Mathias Ahii [1] ; Cordeiro-Araujo, Micheline Kezia [1, 2] ; Bittencourt-Oliveira, Maria do Carmo [1]
Total Authors: 3
Affiliation:
[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
Total Affiliations: 2
Document type: Journal article
Source: HARMFUL ALGAE; v. 49, p. 135-146, NOV 2015.
Web of Science Citations: 6
Abstract

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)

FAPESP's process: 13/11306-3 - The Effects of anatoxin-a and cylindrospermopsin at different nitrogen concentrations and photon irradiances on the physiology of Microcystis aeruginosa (Cyanobacteria) and Scenedesmus acuminatus (Chlolrophyta)
Grantee:Mathias Ahii Chia
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 14/26898-6 - Unravelling some physiological and molecular processes involved in the allelopathic interactions between toxic and non-toxic phytoplankton
Grantee:Mathias Ahii Chia
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 14/01934-0 - Bioaccumulation and detoxification study of cyanobacteria toxins (microcystins and cilindrospermopsin) in lettuce and arugula
Grantee:Maria Do Carmo Bittencourt de Oliveira
Support Opportunities: Regular Research Grants