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© Jean Marc Panaud
Cyanobactérie souche "PCC 9401". Souche de la "Pasteur Culture Collection of Cyanobacteria" conservée à l'état axénique dans l'Unité des Cyanobactéries. La PCC est l'une des Collections spécialisées de l'Institut Pasteur.
Publication : Scientific reports

Insights into the Planktothrix genus: Genomic and metabolic comparison of benthic and planktic strains

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Scientific reports - 24 Jan 2017

Pancrace C, Barny MA, Ueoka R, Calteau A, Scalvenzi T, Pédron J, Barbe V, Piel J, Humbert JF, Gugger M

Link to Pubmed [PMID] – 28117406

Sci Rep 2017 Jan;7:41181

Planktothrix is a dominant cyanobacterial genus forming toxic blooms in temperate freshwater ecosystems. We sequenced the genome of planktic and non planktic Planktothrix strains to better represent this genus diversity and life style at the genomic level. Benthic and biphasic strains are rooting the Planktothrix phylogenetic tree and widely expand the pangenome of this genus. We further investigated in silico the genetic potential dedicated to gas vesicles production, nitrogen fixation as well as natural product synthesis and conducted complementary experimental tests by cell culture, microscopy and mass spectrometry. Significant differences for the investigated features could be evidenced between strains of different life styles. The benthic Planktothrix strains showed unexpected characteristics such as buoyancy, nitrogen fixation capacity and unique natural product features. In comparison with Microcystis, another dominant toxic bloom-forming genus in freshwater ecosystem, different evolutionary strategies were highlighted notably as Planktothrix exhibits an overall greater genetic diversity but a smaller genomic plasticity than Microcystis. Our results are shedding light on Planktothrix evolution, phylogeny and physiology in the frame of their diverse life styles.

https://www.ncbi.nlm.nih.gov/pubmed/28117406