Volume 1, Issue 2 (October 2016)

Original research papers



E.D. Marčiulionienė, O. Jefanova, V. Sakalauskas, O. Sevriukova

Pages: 128-131

DOI: 10.21175/RadJ.2016.02.023

Received: 24 MAR 2015, Received revised: 22 MAY 2015, Accepted: 29 MAY 2015, Published online: 18 OCT 2016

In the present study, we investigated the accumulation of 137Cs and 90Sr in compartments of the Nitellopsis obtusa cells. The effect of Sr2+, Cs+ and Ca2+, K+, which are chemical analogues of 90Sr and 137Cs, to the bioelectric parameters of these algae were studied simultaneously. The aim of this work was studying the penetration of 137Cs and 90Sr through regulating membrane barriers in the cells of starry stonewort (Nitellopsis obtusa). 137Cs and 90Sr are accumulated mainly in the cell membrane (75% to 92%) of these algae. The cell membrane as a cation exchanger regulates ion flow through the first cells diffusion barrier – its thick outer cytomembrane (the complex consisting of the cell wall and plasmalemma). Significantly, smaller amounts of 137Cs and 90Sr enter into the cytoplasm than in the cytomembrane, 10-20% and 3-10%, respectively. Analysis of the accumulation levels of 137Cs and 90Sr in the compartments of the Nitellopsis obtusa cells show their accumulation in the cell membrane as well as their active transport through outer and inner cytoplasmic membranes. Membrane potentials determined mainly by the gradient of the K+ ions are doing an important regulatory function in this process. From the obtained data it results that cells of Nitellopsis obtusa algae can be a convenient radioecological model for the study of the accumulation of radionuclides in plants at the cellular level.
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