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JPR Advance Access originally published online on February 18, 2009
Journal of Plankton Research 2009 31(5):465-480; doi:10.1093/plankt/fbp011
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© The Author 2009. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Genetic and morphologic characterization of four putative cylindrospermopsin producing species of the cyanobacterial genera Anabaena and Aphanizomenon

Anke Stüken1,2,*, Rebecca J. Campbell3,4, Antonio Quesada5, Assaf Sukenik6, Pawan K. Dadheech7 and Claudia Wiedner1

1 Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Department Ecology of Stratified Lakes, Alte Fischerhütte 2, 16775 Stechlin, Germany 2 Department of Biology, Centre for Ecological and Evolutionary Synthesis (CEES), University of Oslo, 0316 Oslo, Norway 3 Cooperative Centre for Water Quality and Treatment, Australian Water Quality Centre, SA Water Corporation, Salisbury, South Australia, Australia 4 School of Pharmacy and Medical Sciences, University of South Australia, GPO Box 2471, Adelaide, South Australia 5001, Australia 5 Departamento de Biología, C/Darwin, 2, Universidad Autónoma de Madrid, 28049 Madrid, Spain 6 Israel Oceanographic and Limnological Research, Yigal Allon Kinneret Limnological Laboratory, PO Box 447, 14950 Migdal, Israel 7 Department of Botany, Government College, Ajmer-305 001, Rajasthan, India

* CORRESPONDING AUTHOR: anke.stuken{at}web.de

Received on September 24, 2008; accepted on January 24, 2009


  Abstract

Cylindrospermopsin (CYN) is a potent hepatotoxic alkaloid that has been detected in freshwater samples worldwide and is produced by a number of cyanobacterial species, mainly of the genera Cylindrospermopsis, Aphanizomenon and Anabaena. Cylindrospermopsis raciborskii is a morphologically distinctive species which forms a genetically well-defined cluster. In contrast, some species within Aphanizomenon and Anabaena are morphologically not clearly assignable to either genera and both genera are polyphyletic. In the Cylindrospermopsis cluster CYN producing and non-producing strains co-occur, but it is not known if CYN producing and non-producing strains are closely related in Anabaena and Aphanizomenon. Here we attempt to disentangle the phylogenetic relationships of four taxa of the genera Anabaena and Aphanizomenon, some of which are known as CYN producers. We have sequenced and phylogenetically analysed partial sequences of the 16S rRNA gene, cpcBA-IGS and rpoC1 from 31 cyanobacteria isolates of the genera Aphanizomenon and Anabaena and have documented morphotypic characteristics of new and recently isolated strains. Our results do not corroborate the separation of Aph. gracile and Aph. flos-aquae into separate species. In contrast, they support the distinction of Ana. bergii and Aph. ovalisporum into distinct taxa. Further, Ana. bergii is most likely not a CYN producing species.

Corresponding editor: William Li


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