Lead Phytotoxicity in Norway Spruce (Picea abies (L.) Karst.) : The Effect of Pb an Zeatin-Riboside on Root Respiratory Potential : 2nd Slovenian Symposium on Plant Physiology with international Participation, Gozd Martuljek. Slovenia, September, 30 to Oktober 2nd, 1998

1999

S. 155-159

2 Abb., 11 Lit.

Unselbständiges Werk

200059367

Hydroponically grown Picea abies (L.) Karst. seedlings were exposed to lead (5 öM) and zeatin-riboside (ZR) treatments (1 öM, periodically) in a factorial experiment. The influence of Pb and ZR on the seedlings was examined studying photochemical efficiency 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 efficiency. The lead exerted an influence mainly on the root system. In pb treated seedling 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 respiration increases the ability to overcome stress conditions. The presence of cytokinin in the rhizosphere could be an important factor affecting Pb toxicity.