Abstract
Two submersed macrophytes (Ceratophyllum demersum and Myriophyl- lum spicatum) were exposed to water containing 10 mg Se(IV) L–1, later transferred to water without Se and exposed again to 10 mg Se(IV) L–1 with the aim to observe the recovery of plants. After each transplantation trial, potential photochemical efficiency of photosystem II, respiratory potential and the amount of photosynthethic pigments and anthocyanins were measured. Photochemical efficiency was similar in all three trials. Electron transport system (ETS) activity increased dramatically in C. demersum plants that were transferred from the water with Se to the water without Se, while ETS activity strongly increased in M. spicatum specimens, when the second time transferred to water containing Se. Alternation in the concentration of Se in the growth media demanded metabolic changes in studied plants. The amount of chlorophylls was higher in plants of M. spicatum growing in water without Se than in exposed plants, while the amount of carotenoids and anthocyanins decreased in the same species grew in water without Se. The amount of Se was higher in plants exposed to Se, while plants that grew in water without Se had lower amount of Se in the tissues.
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