Investigation of Mechanisms of Potassium and Cesium-137 Uptake by Plants with Optical and Gamma Spectrometries in the Field under Water-Stressed Conditions
DOI:
https://doi.org/10.15407/ujpe63.3.238Keywords:
cesium, ion channel, potassium, root, soil humidity, soil solutionAbstract
Channels of the 137Cs and potassium transfer from soil to plants in the field under water-stressed conditions are investigated. Different rapidly maturing plants were grown and selected simultaneously several times during the 2012 and 2013 seasons at the same experimental sites with different soil types under natural conditions at the Chornobyl 10-km Exclusion Zone. After each selection, the contents of 137Cs and K in the plants and extracted soil solutions were measured. Potassium and cesium entered plant roots, as a rule, through transporters with low selectivity, when the concentration of dissolved potassium (CK) in soil was greater than 2 /ug/cm3. In this case, the selectivity of the plant uptake for 137Cs versus potassium r was near 1. However, when CK was between 0.5 and 2 /ug/cm3, potassium also appeared to enter plant roots through highly selective potassium transporters, while cesium entered roots only through the transporters with low selectivity. In this case, the value of r was much less than 1. When CK was less than 0.5 /ug/cm3, cesium and potassium appeared to enter roots through a complement of transporters with greater selectivity for cesium than for potassium. The value of r in this case could exceed 1.
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