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Some heavy metals such as Zn are essential micronutrients for plants.   However, in a high concentration in soils they could cause repression of   growth with toxicity symptoms. It is therefore very important to investigate   the species that are tolerant to high concentration of zinc which have the   ability to survive on soils contaminated with heavy metals. This paper   presents an investigation of the effect of elevated Zn concentrations on the   germination and seedling growth of the invasive tree species Ailanthus   altissima (Swingle) Mill., aimed at a better understanding of its adaptation   ability to heavy metal stress and potential use in phytoremediation. Seeds of   Ailanthus altissima were treated with Zn concentrations of 25, 100 and 250 μM   in form of zinc sulfate. After germination, the seedlings at the stage of   first leaf development were transferred into a growing chamber in the   hydroponic system where zinc sulfate was added in the concentrations of 100,   250 and 500 μM. The results showed that Zn treatments, including the highest   concentration, have caused a reduction in seed germination parameters.   Considering the hypocotyl and radicle length, there was no significant   statistical difference among the treatments, but further growth of young   seedlings in hydroponics under high concentrations of Zn, cause an inhibition   of the root system growth and repress development of assimilating organs.   Seeds and seedlings of A. altissima are tolerant to elevated Zn   concentrations at early stages of development. However, later on with leaves   development, the inhibitory effect of the strongest concentrations is   expressed. [Projekat Ministarstva nauke Republike Srbije, br. 43007: Studying   climate change and its influence on the environment: impacts, adaptation and   mitigation

The effect of elevated Zn concentrations on seed germination and young seedling growth of Ailanthus altissima (Mill.) swingle