Reaction of the sunflower (Helianthus annuus L.) to nickel conditioned by the way of metal penetration
Szymanska, M., E-mail: [email protected] | Matraszek, R. (Lublin Agricultural University (Poland). Dept. of Plant Physiology)
Nickel was introduced into the nutritional solution (intraroot application) at amounts: 0 (control), 35, 100 or 200 mcM, while intraleaf application was performed by spraying plants with water (control) or nickel containing solution at the concentration of 5 or 10 mcM. Plants treated with nickel intraroot than intraleaf were characterized by a considerably higher metal content in roots and lower in leaves. Independently of the penetration way increasing metal concentrations caused a significant decrease of the parameters of physiological root activity, i.e. the root volume, total and active adsorption surface and 1 cubic cm root active surface, in that a greater decrease of the root parameters was shown on intraroot than intraleaf application of the metal. Environment contamination with nickel caused also a chlorophyll concentration decrease in leaves, in that intraleaf nickel application, in contrast to intraroot, resulted in a higher decrease of chlorophyll b than a. Older than younger leaves showed a higher susceptibility to nickel applied intraroot, whereas roots were resistant to nickel applied intraleaf. The content of S-SO4 in the sunflower depended on the nickel concentration and penetration way - intraleaf nickel application caused significant S-SO4 increase in leaves and roots, whereas intraroot application resulted in S-SO4 content increase especially in roots
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