Effects of zinc and copper on growth and metal accumulation in duckweed, Lemna minor
- Bogazici Univ., Istanbul (Turkey)
Heavy metal pollutants are known to be quite toxic to a wide variety of aquatic plants. Lemna (duckweed), due to its special feature, is sought as a test organism for aquatic pollutant studies and for wastewater treatment. Lemna grows rapidly and reproduces vegetatively; its biomass is measured easily. It is adaptable to various aquatic conditions; it extacts and also accumulates metals in its frond bodies. Among the metals, Cu is classified as extremely toxic and Zn is classified as moderately toxic to Lemna. It is reported that both Cu and Zn concentrations in the medium have a great impact on the growth responses and the physiological processes in Lemna. Deficiencies in Cu and Zn resulted in chlorosis of L.minor fronds and low concentrations of CU interfered with the floral induction in L.minor and L.gibba. Excess Cu inhibited both frond growth and frond multiplication of L. paucicostata and it decreased the content of chlorophyll [alpha] and photosynthetic CO[sub 2] uptake in L.minor. In water bodies, metals always are present in combination. Consequently, metal pair interaction is a factor to be considered. However, there are few studies on the effects of metal pair interactions on duckweed growth and metal accumulation. The purpose of this study was to investigate the effects of increased concentrations of Zn and Cu in combination on growth and metal accumulation by Lemna minor L. under controlled laboratory conditions. Zn and Cu were chosen since they are known as essential trace elements for duckweed up to a certain concentration; above that growth inhibition might occur. 16 refs., 3 figs., 6 tabs.
- OSTI ID:
- 6870419
- Journal Information:
- Bulletin of Environmental Contamination and Toxicology; (United States), Vol. 53:3; ISSN 0007-4861
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
AQUATIC ECOSYSTEMS
WATER POLLUTION
COPPER
BIOLOGICAL ACCUMULATION
BIOLOGICAL EFFECTS
LEAD
PLANTS
PLANT GROWTH
ECOSYSTEMS
ELEMENTS
GROWTH
METALS
POLLUTION
TRANSITION ELEMENTS
560300* - Chemicals Metabolism & Toxicology
540320 - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)