Composition of picocyanobacteria community in the Great Mazurian Lakes: isolation of phycoerythrin-rich and phycocyanin-rich ecotypes from the system - comparison of two methods

• Autorzy: Jasser I , Karnkowska-Ishikawa A. , Kozlowska E. , Krolicka A. , Lukomska-Kowalczyk M.
• Języki publikacji: EN

Abstrakty

EN

The study showed that the picocyanobacteria community of the Great Mazurian Lakes system (GML) was dominated by phycoerythrin-rich (PE) ecotypes and demonstrated a gradual decrease of the ratio between PE and phycocyanin-rich (PC) ecotypes. The Great Mazurian Lakes offer better conditions for the PE ecotype than for the PC one, despite the considerably high trophic status, probably thanks to low turbidity and attenuation of light in the water column. The successful isolation of PE and PC picocyanobacteria was achieved by two methods: the classic plate method and a modified flow-cytometry method. The modified flow-cytometry method proved to be superior: being more selective for PE picocyanobacteria as well as less time consuming and less laborious. The modifications introduced to the method, such us concentration of cyanobacterial cells by centrifugation to the density required by the flow cytometer, did not hinder the isolation while allowing to skip an intermediate phase of enrichment cultures that had been formerly proposed. The first phylogenetic analyses based on cpcBA operon and 16S rRNA gene demonstrated that picocyanobacteria isolates from GML could, with a high bootstrap support, be grouped into five and four clusters, respectively. Based on a cpcBA-IGS analysis and IGS length the study suggests that at least one of the clusters is new and has not been previously described.

Słowa kluczowe

EN

ecotype isolation; flow cytometry; picocyanobacteria; freshwater picocyanobacteria; phycoerythrin; phycocyanin; Mazurian Lakeland; picoplankton

• Wydawca: -
• Czasopismo: Polish Journal of Microbiology
• Rocznik: 2010
• Tom: 59
• Numer: 1
• Opis fizyczny: p.21-31,fig.,ref.

Twórcy

autor

Jasser I

• University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland

autor

Karnkowska-Ishikawa A.

autor

Kozlowska E.

autor

Krolicka A.

autor

Lukomska-Kowalczyk M.

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