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ŠUMARSKI LIST 5-6/2015 str. 18     <-- 18 -->        PDF

was analysed as well as activity of antioxidant enzyme phenylalanine-ammonium liase (PAL). Total polyphenol content in poplar treated with 10 mg Cd kg–1 soil and 25 mg Cd kg–1 soil increased compared to the control (Figure 4). Furthermore, phenylalanine-ammonium liase (PAL) activity increased only in poplar treated with 10 mg Cd kg–1 soil compared to the control (Figure 5). Observed higher total polyphenol content is connected with increased phenylalanine-ammonium liase (PAL) activity and de novo polyphenol synthesis in plant during the stress caused by exposure to cadmium. Results indicate that the tested poplar (Populus nigra var. italica) can be considered as a species with potential for phytoextraction of cadmium from polluted soil. Furthermore, antioxidant enzymes and polyphenolic compounds in poplar have the important role in the defence from oxidative stress caused by exposure to cadmium.
KEY WORDS: phytoremediation, poplar, cadmium, polyphenolic compounds, enzyme phenylalanine-ammonium liase