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In the current study we investigated the effectiveness of synthetic Thidiazuron (TDZ), Cytodef (CTD), Epin-Extra® (24-EB) and natural Ribav-Extra® (RE) plant growth regulators (PGR) with a view to improving the heavy metal-tolerance in intact plants. To evaluate the effectiveness of PGR we chose the following parameters: the axial growth (as an integral indicator of the plant response to the environment), the superoxide generation (as an indicator of oxidative stress), the malondialdehyde (MDA) content (as an indicator of oxidative damage degree in plants), catalase (CAT) activity (as an indicator of the antioxidant defence systems activity) and the PGR capacity to change absorption and translocation of heavy metals in plants. The efficiency index was estimated on the basis of the results of winter wheat (Triticum aestivum L.) seedlings affected by 10 µM or 1 mM Zn2+, Cu2+ and Ni2+ or Pb2+ heavy metals. An empirical scale of the efficiency of PGR was developed. The study found that the efficiency of the PGR investigated with respect to tolerance of heavy metals increased as follows: TDZ

The presentation was made at the 8th international conference "The Vital Nature Sign" on 15-17 May, 2014 The study examined the non-target effects of phenoxy herbicide MCPA (4-chloro-2-methyl-phenoxy acid) on the morphological and physiological characteristics of spring wheat (Triticum aestivum L.) under field conditions. The experiment was conducted in 4 mesocoms plots (0.1 a) from May to August 2012. The plants were sprayed directly with herbicide spray solutions equivalent of recommended field application rate. The mea sured endpoints were as follows: height of the shoots, length of the roots, dry biomass, concentrations of chlorophyll a, b, caro tenoids, malondialdehyde (MDA). The yield of wheat and residues of MCPA in wheat tissues and soil were also estimated. It was observed that herbicide slightly reduced spring wheat stem height (by 9%, p < 0.05), increased root length (p > 0.05). Dry weight of spring wheat stems and roots decreased by 14% (p < 0.05) and 17% (p > 0.05), respectively. The herbicide did not evoke significant effect on the content of photosynthetic pigments and MDA in plant tissues. MCPA herbicide residues were observed only in soil and stems of spring wheat and were 0.97 μg/kg and 0.047 mg/kg, respectively. [ABSTRACT FROM AUTHOR]

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