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Applied and Environmental Microbiology
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Journal Article

Potassium Salts Inhibit Growth of the Cyanobacteria Microcystis spp. in Pond Water and Defined Media: Implications for Control of Microcystin-Producing Aquatic Blooms.

D L Parker, H D Kumar, L C Rai, J B Singh
D L Parker
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H D Kumar
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L C Rai
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J B Singh
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ABSTRACT

Ten metals were assayed in 21 Indian ponds which comprised three groups: (i) eutrophic alkaline ponds containing <2.5 mM potassium and thick growths of Microcystis aeruginosa or Microcystis flos-aquae during most of the year, (ii) equally eutrophic alkaline ponds containing >2.8 mM potassium and no detectable Microcystis growth, and (iii) oligo- or mesotrophic ponds with various potassium and hydrogen ion concentrations and no persistent Microcystis blooms. The effects of potassium on Microcystis growth were examined in filter-sterilized pond water and in defined culture media. A 50% reduction in the 10-day yield of cultured M. aeruginosa was observed in DP medium and pond water supplemented with 1 and 3 mM KCl, respectively. In contrast, the addition of 2 to 30 mM NaCl did not suppress the growth of M. aeruginosa in either DP medium or pond water. Both 5 mM KCl and 20 mM KHCO(inf3) in J medium strongly inhibited the growth of M. flos-aquae C3-9, whereas 5 to 30 mM NaCl had no effect and 20 mM NaHCO(inf3) was stimulatory. For pond water cultured with a mixture of M. aeruginosa and the duckweed Wolffia arrhiza, M. aeruginosa dominated in unsupplemented water and W. arrhiza dominated in water supplemented with 4.8 mM KCl. Implications for the ecology and control of Microcystis blooms are discussed.

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Potassium Salts Inhibit Growth of the Cyanobacteria Microcystis spp. in Pond Water and Defined Media: Implications for Control of Microcystin-Producing Aquatic Blooms.
D L Parker, H D Kumar, L C Rai, J B Singh
Applied and Environmental Microbiology Jun 1997, 63 (6) 2324-2329; DOI:

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Potassium Salts Inhibit Growth of the Cyanobacteria Microcystis spp. in Pond Water and Defined Media: Implications for Control of Microcystin-Producing Aquatic Blooms.
D L Parker, H D Kumar, L C Rai, J B Singh
Applied and Environmental Microbiology Jun 1997, 63 (6) 2324-2329; DOI:
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