First report of microcystin-producing Fischerella sp. (Stigonematales, Cyanobacteria) in tropical Australia

A polyphasic study of four Stigonematales cyanobacteria from tropical Australia (Queensland) revealed production of the hepatotoxins microcystins (MC-LR, MC-LA, MC-LF, MC-FR and demethyl-MC-LR) by Fischerella sp. NQAIF311 isolated from a seasonal creek. Total microcystin content reached 43 μg g−1 dr...

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Bibliographic Details
Published in:Toxicon (Oxford) 2014-09, Vol.88, p.62-66
Main Authors: Cirés, Samuel, Alvarez-Roa, Carlos, Wood, Susanna A., Puddick, Jonathan, Loza, Virginia, Heimann, Kirsten
Format: Article
Language:English
Subjects:
Benthic
Cyanobacteria
Cyanobacteria - classification
Cyanobacteria - genetics
Cyanobacteria - isolation & purification
Fischerella
Hepatotoxin
Microcystin
Microcystins - biosynthesis
Phylogeny
Queensland
Stigonematales
Tropical
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Summary:A polyphasic study of four Stigonematales cyanobacteria from tropical Australia (Queensland) revealed production of the hepatotoxins microcystins (MC-LR, MC-LA, MC-LF, MC-FR and demethyl-MC-LR) by Fischerella sp. NQAIF311 isolated from a seasonal creek. Total microcystin content reached 43 μg g−1 dry weight. Phylogeny demonstrated high sequence similarities for 16S rRNA (99%), mcyE (97%) and mcyD (95%) genes with microcystin-producing Fischerella sp. CENA161 from Brazil. This is the first report of a cyanotoxin-producing Stigonematal in Australia. •Four Stigonematales cyanobacteria from tropical Australia were studied for cyanotoxin production and cyanotoxin-biosynthesis genes.•Fischerella sp. NQAIF311 produced the hepatotoxins microcystins.•Maximum microcystin content of 43 μg g−1 dry weight was found in culture medium without nitrogen.•Phylogenetic data indicated a close proximity with microcystin-producing Fischerella sp. isolated from Brazil.•First report of cyanotoxin production by a Stigonematal cyanobacterium in Australia.
ISSN:0041-0101
1879-3150
DOI:10.1016/j.toxicon.2014.06.010