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The Removal of Cyanobacterial Hepatotoxin [Dha7] Microcystin-LR via Bioaccumulation in Water Lettuce (Pistia stratiotes L.)


The removal of [Dha7] microcystin-LR through bioaccumulation in six aquatic plants was investigated. The aquatic plant water lettuce (Pistia stratiotes L.) exhibited the highest removal, with 13 % of the toxin remaining after a 7-day exposure period. Removal by P. stratiotes (with 0.5 and 1.0 mg/L of the toxin) was faster and greater in static systems than in continuous flow systems. In the static experiment, P. stratiotes roots accumulated [Dha7] microcystin-LR up to a concentration of 0.0088 ng/mg wet wt. plant material, whereas in the continuous flow system, the plant root tissue accumulated the toxin up to a concentration of 0.0041 ng/mg wet wt. plant material. Exposure to the toxin at concentrations of 0.5 and 1.0 mg/L induced changes in the development of P. stratiotes, including short, thin and rotted roots with decreased leaf counts after 3 days of exposure.

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This work was supported by KhonKaen University, Thailand, under the Incubation Researcher Project.

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Correspondence to Theerasak Somdee.

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Somdee, T., Thathong, B. & Somdee, A. The Removal of Cyanobacterial Hepatotoxin [Dha7] Microcystin-LR via Bioaccumulation in Water Lettuce (Pistia stratiotes L.). Bull Environ Contam Toxicol 96, 388–394 (2016).

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  • [Dha7] microcystin-LR
  • Water lettuce
  • Pistia stratiotes
  • Removal
  • Bioaccumulation