Authors:J. Marešová, L. Remenárová, M. Horník, M. Pipíška, J. Augustín, and J. Lesný
The aim of this paper was to obtain quantitative data of foliar uptake kinetics and long distance transport of zinc in tobacco
(Nicotiana tabacum L.) and hop (Humulus lupulus L.) plants. Zinc was used as a model of microelement and toxic metal, tobacco and hop as a representatives of agriculturally
important plants. A tip of leaf blade was immersed in the solution spiked with 65ZnCl2 and foliar uptake and translocation to other parts of the plant grown in nutrient solution was measured by gamma-spectrometry
and autoradiography. We found that foliar zinc uptake by both plants is dependent on the initial metal concentration within
the range C0 = 10–100 μmol dm−3 ZnCl2. Zinc is immobilized mainly in immersed part of the contact leaf and only <1% is transported to non-immersed parts of the
leaf. At C0 = 0.1 mmol dm−3 ZnCl2 concentrations >2.5 mg/g Zn and 4.8 mg/g Zn (dry wt.) in immersed part of tobacco and hop leaf plant, respectively were found
after 5 days of exposure. Low mobility of zinc entering the plant via the leaf surface can be attributed to the immobilization
of zinc into Zn–ligand complexes with high stability constants log K at pH 6.0–8.0, such as the reaction products of Zn2+ ions with citric acid, histidine or phosphates. Zinc can be extracted from dried leaves by the solutions of inorganic salts,
carboxylic acids, amino acids and synthetic complexing ligands such as EDTA. Anionic (SDS) and non-ionic (Tween 40) surfactants
causes the decrease of the Zn foliar uptake, but not translocation of Zn from the contact leaf area. Obtained data are discussed
from the point of view of possible limited efficiency of liquid formulations designed for practical applications as Zn foliar
Authors:S. Topcuoğlu, N. Güngör, A. Köse, and A. Varinlioğlu
Translocation and percent distribution of137Cs in different parts of the tea plant have been investigated from the foliar aborption and root uptake in Chemobyl contaiminated soil during 1987–1994. The results showed that the transfer of the radionuclide from soil to the plant occurred only in the roots during this long period. On the other hand, the present data confirmed that the new leaves of the plant directly accumulated137Cs from the stem in growing seasons after translocation into the stem from leaves during the Chemobyl accident. The natural depuration rate of137Cs in the stem part of tea plant is estimated as on effective half-life 1750 days.
The uptake and translocation of14C labelled acetochlor and EPTC herbicides were followed in experiments with maize /Zea mays L./ and mustard /Sinapis alba L./ in nutrient solutions. Radioactivity data were comparatively evaluated for approaching the origin of the different phytotoxicity of these herbicides to the plants used. Results obtained are in good agreement with the extent and symptoms of herbicide injury on maize and mustard plants grown in acetochlor or EPTC treated sand.
Przulj, N., Momčilović, V. (2001): Genetic variation for dry matter and nitrogen accumulation and translocation in two rowed spring barley. I. Dry matter translocation. Eur. J. Agron., 15, 241–254.