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Water 2014, 6(6), 1807-1825; doi:10.3390/w6061807
Article

Effect of Selected Plant Extracts and D- and L-Lysine on the Cyanobacterium Microcystis aeruginosa

1,2,*  and 1
1 Aquatic Ecology and Water Quality Management Group, Department of Environmental Sciences, Wageningen University, P.O. Box 47, Wageningen 6700 AA, The Netherlands 2 Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), P.O. Box 50, Wageningen 6700 AB, The Netherlands
* Author to whom correspondence should be addressed.
Received: 26 April 2014 / Revised: 7 June 2014 / Accepted: 10 June 2014 / Published: 17 June 2014
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Abstract

We tested extracts from Fructus mume, Salvia miltiorrhiza and Moringa oleifera as well as L-lysine and D-Lysine as curative measures to rapidly suppress the cyanobacterium Microcystis aeruginosa NIVA-CYA 43. We tested these compounds under similar conditions to facilitate comparisons. We hypothesized that for each compound, relatively low concentrations—i.e., 5–50 mg L−1, would reduce M. aeruginosa biomass. At these low concentrations, only L-lysine caused a decline in M. aeruginosa biomass at ≥4.3 mg L−1. F. mume extract was effective to do so at high concentrations, i.e., at ≥240 mg L−1, but the others were virtually non-effective. Low pH caused by organic acids is a probable explanation for the effect of F. mume extract. No complete wipe-outs of the experimental population were achieved as Photosystem II efficiency showed a recovery after six days. L-lysine may be effective at low concentrations—meaning low material costs. However, the effect of L-lysine seems relatively short-lived. Overall, the results of our study did not support the use of the tested plant extracts and amino-acid as promising candidates for curative application in M. aeruginosa bloom control.
Keywords: eutrophication control; mitigation; natural algaecide; nuisance cyanobacteria eutrophication control; mitigation; natural algaecide; nuisance cyanobacteria
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Lürling, M.; van Oosterhout, F. Effect of Selected Plant Extracts and D- and L-Lysine on the Cyanobacterium Microcystis aeruginosa. Water 2014, 6, 1807-1825.

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