Chelator-Enhanced Lead Accumulation in Agropyron Elongatum cv. Szarvasi-1 in Hydroponic Culture
2011
Vashegyi, Ildikó | Cseh, Edit | Lévai, László | Fodor, Ferenc
Hydroponic culture was applied to compare the efficiency of K₂EDTA and citrate in mobilizing Pb for accumulation in Agropyron elongatum cv. Szarvasi-1 and their effects on some physiological characteristics of the plants. The plants were grown in nutrient solutions containing 0, 10, and 100 μM Pb(NO₃)₂ combined with chelating agents added to the nutrient solutions after 21 days of growth, in 3 concentrations (0, 100, and 500 μM). The effects were measured after eight days. The energy grass proved to be greatly resistant to the treatments, as was reflected in the slight inhibition of growth, the resistance of the photosynthetic electron transport chain and the chlorophyll composition and the lack of change in the malone-dialdehyde content. Fundamental differences can be identified between the effects of EDTA and citrate. Citrate had only a little effect on the physiological parameters, which may be due to the strongly increasing lead accumulation with increasing concentration of Pb in the nutrient solution. Additionally, citrate ensured a higher biomass yield with higher shoot Pb accumulation compared to EDTA in almost all treatments. Concerning biomass reduction, 10 μM Pb applied together with K₂EDTA has the most deleterious effects on energy grass. The effects correlated with the concentration of EDTA.
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