Water Science & Technology: Water Supply Vol 1 No 2 pp 247–250 © IWA Publishing 2001
The control of cyanobacterial blooms by plant growth retardants
(ancymidol, paclobutrazol, uniconazole)
Z Romanowska-Duda*, M Tarczyńska** and M Zalewski***
*
Department of Plant Growth Regulation, University of Łodz,
Banacha 12/16, 90-237 Łodz, Poland
**
Department of Applied Ecology, University of Łodz,
Banacha 12/16, 90-237 Łodz, Poland
***
Department of Applied Ecology, University of Łodz,
Banacha 12/16, 90-237 Łodz, Poland
ABSTRACT
The seasonal blooming of cyanobacteria in water bodies creates considerable
medical and veterinary problems, because certain species are potential
sources of toxins, principally neuro- and hepatotoxins. Much effort has
been devoted to prevent them blooming. In this study, axenic cultures of
Microcystis aeruginosa and Anabaena sp. were cultivated in medium Z
supplemented with growth retardants. Cells were counted under a microscope
each week for up to 8 weeks of culture. The growth retardants paclobutrazol,
ancymidol and uniconazole greatly reduced the number of living cells, the
effect already being striking after 24 hours of culture. Plant growth
retardants can be effectively used in control of cyanobacterial blooms.
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