Growth and Lead Accumulation Capacity of Lemna minor and Spirodela polyrhiza (Lemnaceae): Interactions with Nutrient Enrichment.
A study to understand the biological effects of samples prepared with lead and the effects of lead were conducted on Lemna minor L. and Spirodela polyrhiza (L.) Schleid. This study was intended to test the hypothesis that nutrient enrichment (P, NO(3) (-)-N and SO(4) (2-)) enhances the metal tolerance of floating macrophytes. The plants were exposed to Pb concentrations 0, 1, 5, 10, 25, and 50 mg l(-1) for a period of 1, 3, 5, and 7 days. L. minor accumulated 561 mg g(-1) dry weight (dw) Pb, and S. polyrhiza accumulated 330 mg g(-1) dw Pb after 7 days, whereas in the groups enriched with nutrients, L. minor accumulated 128.7 mg g(-1) Pb and S. polyrhiza accumulated 68.7 mg g(-1) dw Pb after 7 days. Relative growth rates and photosynthetic pigments (chlorophyll a, b, and carotenoid) were measured in L. minor and S. polyrhiza exposed to different Pb concentrations under laboratory conditions. Relative growth rates were negatively correlated with metal exposure, but nutrient addition was found to suppress this effect. Photosynthetic pigment levels were found negatively correlated with metal exposure, and nutrient addition attenuated chlorophyll decrease in response to metal exposure. Metal and nutrient concentration in water decreased throughout the experiments. The study concluded that nutrient enrichment increases the tolerance of L. minor and S. polyrhiza to metals, that L. minor and S. polyrhiza are suitable candidates for the phytoremediation of low-level lead pollution, and that L. minor was more effective in extracting lead than was S. polyrhiza.
Faculty of Science and Arts Department of Biology, Erciyes University, 38039 Kayseri, Turkey.
Zeliha
Z
Leblebici
Ahmet
A
Aksoy
Ecotoxicol Environ Saf. 2002 Nov;53(3):439-45
12485590
Bioresour Technol. 2009 Dec;100(23):6137-40
19581083
J Environ Qual. 2004 Jul-Aug;33(4):1247-55
15254106
Bioresour Technol. 2008 Oct;99(15):7091-7
18296043
Aquat Toxicol. 2008 Sep 17;89(3):167-71
18675470
Environ Pollut. 2001;115(1):49-64
11586773
Environ Pollut. 2002;120(2):307-11
12395843
Plant Physiol. 1980 Nov;66(5):797-800
16661528
Environ Pollut. 2010 Jan;158(1):18-23
19683373
Sci Total Environ. 2001 Oct 20;278(1-3):11-22
11669259
Chemosphere. 2006 Nov;65(6):1027-39
16682069
J Hazard Mater. 2008 Dec 30;160(2-3):356-61
18430512