Basic Pathways of Caesium-137 and Strontium-90 Radionuclides Uptake by Plant Root Sysytems

摘要

The problem of reducing radionuclides accumulation in plants can be effectively solved only on the basis of knowledge of mechanisms responsible for the initial uptake and the following redistribution of radionuclides along a plant organism. The majority of the works, devoted to the problem of nuclides accumulation in plants, were conducted on the whole plants and were limited by measuring of accumulation coefficients for the whole plant or for its separate organs and tissues. A discrimination coefficient of a radionuclide relatively to its non-radioactive chemical analogy -potassium for radiocesium and calcium for radiostrontium - was registered mach more rarely [I]. Such a phenomenological approach gives a possibility to work out corresponding agromeliorative measures only by means conducting of great number of experiments with considerable expenditures, and it does not guarantee the optimum of the obtained decisions. On the other hand, the attention of investigators of ionic transport in plants was concentrated on study of the transfer of physiologically important substances and ions, except Cs and Sr. As a result, data on mechanisms of transport of basic radionuclides - contaminators Cs-137 and Sr-90 are limited and of a fragmentary character.