04 - LandReclamation_17x24_180pag_Predare3_04 - LandReclamation_17x24_180pag_Predare

Selenium and molybdenum are essential trace elements. Considering the characteristics of selenium and molybdenum, our research had the following purposes for both elements: Considering Se the uptake of selenium was investigatein maize and sunflower seedling, moreover the different effect of two selenium species (selenite and selenite) for the examined plants (a monocotyledon (maize, Zea mays L.) and a dicotyledon (sunflower, Helianthus annuus L.)). Considering Mo on the one sidedue to increasing level of molybdenum treatment, the concentrations of changes of Mo was investigated in maize and sunflower seedlings. On the other sidewe thought it is important to follow the concentration of this element because it plays prior role in nitrate reduction and operation of nitrate reductase. So we would have liked to prove in laboratory circumstances that there is a close relation between molybdenum supply and nitrate reduction: nitrate content of plants can be reduced by supporting their physiological molybdenum demand. In our experiments for selenite 0 (control), 1, 10 and 100 mg kg selenium concentrations, forselenate0, 0.1, 1 and 10 mg kg selenium concentrations, while for molybdenum doses 0, 30, 90, 270 mg kg were applied. According to our results it is obvious that concentration of selenium and molybdenum in seedlings significantly was increased due to selenium or molybdenum treatments. Examining roots and shoots of experimental plants separately we found higher selenium and molybdenum content in roots than in shoots. It indicates more intensive selenium and molybdenum uptake (selenium and molybdenum mobility) and high molybdenum content shows nitrate accumulation of shoots under the given experimental circumstances.