TY - JOUR T1 - Chemically mediated interactions between Microcystis and Planktothrix : impact on their growth, morphology and metabolic profiles A1 - Briand,Enora A1 - Reubrecht,Sébastien A1 - Mondeguer,Florence A1 - Sibat,Manoella A1 - Hess,Philipp A1 - Amzil,Zouher A1 - Bormans,Myriam AD - IFREMER, Phycotoxins Laboratory; F-44311 Nantes, France AD - UMR CNRS 6553 ECOBIO, Rennes 1 University; F-35042 Rennes, France UR - https://doi.org/10.1111/1462-2920.14490 DO - 10.1111/1462-2920.14490 N2 - Freshwater cyanobacteria are known for their ability to produce bioactive compounds, some of which have been described as allelochemicals. Using a combined approach of co‐cultures and analyses of metabolic profiles, we investigated chemically mediated interactions between two cyanobacterial strains, Microcystis aeruginosa PCC7806 and Planktothrix agardhii PCC7805. More precisely, we evaluated changes in growth, morphology and metabolite production and release by both interacting species. Co‐culture of Microcystis with Planktothrix resulted in a reduction of the growth of Planktothrix together with a decrease of its trichome size and alterations in the morphology of its cells. The production of intracellular compounds by Planktothrix showed a slight decrease between mono and co‐culture conditions. Concerning Microcystis, the number of intracellular compounds was higher under co‐culture condition than under monoculture. Overall, Microcystis produced a lower number of intracellular compounds under monoculture than Planktothrix, and a higher number of intracellular compounds than Planktothrix under co‐culture condition. Our investigation did not allow us to identify specifically the compounds causing the observed physiological and morphological changes of Planktothrix cells. However, altogether, these results suggest that co‐culture induces specific compounds as a response by Microcystis to the presence of Planktothrix. Further studies should be undertaken for identification of such potential allelochemicals. Y1 - 2019/05 PB - Wiley JF - Environmental Microbiology SN - 1462-2912 VL - 21 IS - 5 SP - 1552 EP - 1566 ID - 58152 ER -