Hydroponically grown Picea abies (L.) Karst. seedlings were exposed to lead (5WM) and zeatin-riboside (ZR) treatments (1 microM, periodically) in a factorial experiment. The influence of Pb and ZR on ...the seedlings was examinedstudying photochemical effciency of PSII in green parts and terminal electron transport system (ETS) activity of the root tissue. Lead and cytokinin, separately or in combination, did not influence the light use effciency. The lead exerted an influence mainly on the root system. In Pb treated seedlings ETS activity of the root tissue was lowered by app. 25% in comparison to the control. Zeatin-riboside mitigates the lead induced inhibition of root growth and the ETS activity is even higher than in control plants. Higher potential cespiration increases the ability to overcome stress conditions. The presence of cytokinin in the rhizosphere could be an importantfactor affecting Pb toxicity.
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