Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2013
Authors
Hanne Sogge Thomas Rohrlack Trine Ballestad Rounge Jørn Henrik Sønstebø Ave Tooming-Klunderud Tom Kristensen Kjetill Sigurd JakobsenAbstract
Several Planktothrix strains, each producing a distinct oligopeptide profile, have been shown to coexist within Lake Steinsfjorden (Norway). Using nonribosomal peptide synthetase (NRPS) genes as markers, it has been shown that the Planktothrix community comprises distinct genetic variants displaying differences in bloom dynamics, suggesting a Planktothrix subpopulation structure. Here, we investigate the Planktothrix variants inhabiting four lakes in southeast of Norway utilizing both NRPS and non-NRPS genes. Phylogenetic analyses showed similar topologies for both NRPS and non-NRPS genes, and the lakes appear to have similar structuring of Planktothrix genetic variants. The structure of distinct variants was also supported by very low genetic diversity within variants compared to the between-variant diversity. Incongruent topologies and split decomposition revealed recombination events between Planktothrix variants. In several strains the gene variants seem to be a result of recombination. Both NRPS and non-NRPS genes are dominated by purifying selection; however, sites subjected to positive selection were also detected. The presence of similar and well-separated Planktothrix variants with low internal genetic diversity indicates gene flow within Planktothrix populations. Further, the low genetic diversity found between lakes (similar range as within lakes) indicates gene flow also between Planktothrix populations and suggests recent, or recurrent, dispersals. Our data also indicate that recombination has resulted in new genetic variants. Stability within variants and the development of new variants are likely to be influenced by selection patterns and within-variant homologous recombination.
Authors
Dominika Srednicka-Tober Marcin Baranski Joanna Gromadzka-Ostrowska Krystyna Skwarlo-Sonta Ewa Rembialkowska Jana Hajslova Vera Schulzova Ismail Cakmak Levent Ozturk Tomasz Krolikowski Katarzyna Wisniewska Ewelina Hallmann Elzbieta Baca Mick Eyre Håvard Steinshamn Teresa Jordon Carlo LeifertAbstract
No abstract has been registered
Authors
Jarle Werner Bjerke Stef Bokhorst Terry V. Callaghan Matthias Zielke Gareth K. PhoenixAbstract
No abstract has been registered
Authors
Claudio Ioriatti F. Özlem Altindisli Jorunn Børve Lucia Adriana Escudero-Colomar Andrea Lucchi Fabio MolinariAbstract
No abstract has been registered
Editors
Bruce TalbotAbstract
No abstract has been registered
Authors
Arnfinn NesAbstract
No abstract has been registered
Authors
Christian PedersenAbstract
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Abstract
No abstract has been registered
Authors
Anne-Kristin Løes Martha EbbesvikAbstract
No abstract has been registered
Authors
Theo RuissenAbstract
No abstract has been registered