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Toxicity of Seven Herbicides to the Three Cyanobacteria Anabaena flos-aquae  , Microcystis flos-aquae and Mirocystis aeruginosa
Ma, J.; Tong, S.; Wang, P. & Chen, J.
Abstract
The toxicity of 7 herbicides to the three cyanobacteria was tested in this work. The
results indicated that: (1) There was a highly significant relationship between dried weight or
chlorophyll-a and OD680nm for tested cyanobacteria; (2) the toxicity of the tested herbicides with
the order from high to low was: photosynthesis-inhibiting > ACCase inhibitor > protox inhibiting
herbicides; (3) the sensitivity of various species exposed to cyanazine, diclofop, prometryn, simazine
and simetryn varied by over one order of magnitude. The decreasing order of sensitivity of
cyanobacteria to the selected herbicides was: M. Flosaquae > M. Aeruginosa > A. flos-aquae.
Cyanobacteria can produce toxins including hepatotoxins e.g. microcystins and endotoxins e.g.
lipopolysaccharides. Therefore, the research on comparing the differential sensitivity of cyanobacteria
and green algae is of important scientific significance and realistic value
Keywords
Acute Toxicity, Berbicides, Cyanobacteria, Sensitivity
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