The adsorption strategies for iron of anabaena flos-aquae, oscillatoria mougeotii and scenedesmus quadricauda

The adsorption strategies for iron of two cyanobacteria anabaena flos-aquae, oscillatoria mougeotii and one green algae scenedesmus quadricauda at different iron concentration and the growth of three algae at different iron and EDTA concentrations were investigated using batch cultures. The results showed that A. flos-aquaep produced siderophores under low iron and deficient iron condition, and the siderophore productions decreased with the increasing of iron concentration. Siderophore productions retarded the decline of Chl a of A. flos-aquaep. In growth experiment, the growth of two cyanobacteria was significantly inhibited whereas S. quadricauda was not when iron at a low concentration and EDTA at a high concentration. And there was a correlation between specific growth rate and siderophore productions in growth of A. flos-aquaep when iron at a low concentration and EDTA at a high concentration. The experiment suggested that different adsorption strategies for iron had a great effect on the growth of algae under iron-limited condition.