Growth response of the duckweed Lemna minor to heavy metal pollution
Iranian Journal of Environmental Health Science and Engineering. 2009; 6 (3): 161-166
em Inglês
| IMEMR
| ID: emr-103455
ABSTRACT
To assess the tolerance and effect of heavy metals pollution on the duckweed L. minor, the aquatic plants were exposed to different concentrations of copper [Cu], nickel [Ni], cadmium [Cd] and zinc [Zn] in a quarter Coic and Lessaint solution at pH = 6.1 [ +/- 0.1] and under a daily regime of 16 h light [101 micro mol/m[2] s[1]]. Copper at 0.2 mg/L and nickel at 0.5 mg/L promoted the growth of Lemna fronds. At higher concentrations, Cu and Ni inhibited the growth of duckweed; the EC[50] [concentration causing 50% inhibition] were 0.47 mg/L for Cu and 1.29 mg/L for Ni. Cadmium and zinc decreased by 50% the growth of fronds when the medium contained respectively 0.64 and 5.64 mg/L [EC[50]]. Duckweed tolerated Cu, Ni, Cd and Zn at concentrations of 0.4, 3.0, 0.4 and 15.0 mg/L respectively without showing any visible signs of toxicity [chlorosis, frond disconnection and necrosis]. On the basis of visible symptoms and the EC[50] values, the toxicity of the metals on L. minor was in decreasing order of damage Cu > Cd > Ni > Zn. It was concluded that the duckweed L. minor is very sensitive to copper and cadmium pollution
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IMEMR (Mediterrâneo Oriental)
Assunto principal:
Plantas
/
Zinco
/
Cádmio
/
Cobre
/
Poluição Ambiental
/
Crescimento
/
Níquel
Idioma:
Inglês
Revista:
Iran. J. Environ. Health Sci. Eng.
Ano de publicação:
2009
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