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Influence of some metal chelators and light regimes on bioaccumulation and toxicity of Cd 2+ in duckweed ( Lemna gibba )
Author(s) -
Polar Emine,
Küçükcezzar Rezzan
Publication year - 1986
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1986.tb01238.x
Subject(s) - lemna gibba , cadmium , lemna , lemna minor , bioaccumulation , chemistry , nutrient , salicylic acid , zinc , environmental chemistry , botany , chelation , aquatic plant , zoology , biology , biochemistry , inorganic chemistry , ecology , macrophyte , organic chemistry
A factorial culture experiment was designed to investigate the influence of light regimes and of some metal chelators on the accumulation of cadmium by Lemna gibba L. The plants were grown in a complete nutrient solution containing Cd 2+ concentrations ranging from 0 to 27 μ M with or without EDTA, ethylenediamine‐N,N′‐ bis ‐( o ‐hydroxyphenylacetic acid) (EDDHA) or salicylic acid. Each experiment was run for eight days in 18 h:6 h light:dark or continuous light. An increase in the Cd 2+ concentration in plants and a simultaneous drop in accumulation efficiency (ratio of Cd 2+ concentration in plants to the initial Cd 2+ concentration in the nutrient solution) with increasing ambient Cd 2+ levels was best represented by regression power curves. At the lowest Cd 2+ concentration which caused a significant decrease in the relative growth rate of duckweed, there was a decrease in manganese and zinc and an increase in the iron level in the plants. EDDHA and EDTA protected in some cases against the toxic action of cadmium without preventing its uptake by plants. It was thus observed that 9 μ M or higher levels of Cd 2+ were toxic to Lemna gibba depending on the chelator and light regime. Duckweed grown in continuous light produced, in general, more dry matter and hence accumulated more cadmium.