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Six siderophore-producing bacterial strains were isolated from the freshwater, in which five strains belonged to Pseudomona genus, and the other belonged to Stenotrophomonas genus. The strain, Stenotrophomonas maltophilia 15, which produced hydroxamate-type siderophore, was selected for siderophore preparation. Its siderophore production was inhibited by FeCl3, especially when FeCl3 concentration was higher than 20 μM. Effects of siderophore on cyanobacteria Microcystis aeruginosa FACHB-905 and Anabaena flos-aquae FACHB-245 were studied. Compared to the control, almost all the treated groups showed decrease in growth rate and chlorophyll a, carotenoids, phycocyanin, soluble protein, microcystin content, which was attributed the low iron bioavailability in the culture medium. In the study, S. maltophilia 15 showed algicidal activities by secreting siderophore and could inhibit cyanobacterial growth, especially when iron bioavailabity is very low. The two cyanobacterial strains showed distinct demand for iron. It was deduced that in the freshwater the competition between bacteria and cyanobacteria existed for the low-bioavailable iron, which may relate to the replacement of dominant cyanobacteria.
Siderophore; Iron; Microcystis; Anabaena
...obtained. Genomic DNA was extracted, and PCR amplification of 16S rRNA genes were completed according to Weisburg's method (Weisburg et al 1991). PCR products were sequenced by Genscript Biotech Co. Ltd. (China)...
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