Abstract:
Plants manifest a certain reaction against increasing of heavy metals
toxic concentration in the cultivated soils. The differences depends on plant
sensitivity, species, time exposure intensity (concentration of heavy metals,
cultivation length), or amendments applied on cultivated site. The challenge
of this work is to investigate the influences of different amendments such as
biologic active compounds, on the seedling stage and growth responses,
copper uptake and accumulated at different evolution stage of plants. Thus,
physiological responses of maize (Zea mays) under copper ions stress and
polyphenolic amendments were evaluated in pot cultivation experiments
through roots and stem length measurements and quantitative determination
of wet biomass. The distribution of copper ions concentration in different
parts of the plants was estimated by flame atomic absorption spectrometry. In
some cases stimulating effects were identified for different concentrations of
spruce bark extracts applied on maize seed under copper stress. Other
extracts seems to have inhibiting proprieties on maize plant growth. In
conclusion spruce bark extracts can have stimulator as well as inhibitor
effect depending on the concentrations of biological active compounds and
the presence of copper ions.
