Uptake of Carrier-free Cs by Ramalina reticulata |
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| Authors: | Handley R Overstreet R |
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| Affiliation: | Department of Soils and Plant Nutrition, University of California, Berkeley, California 94720. |
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| Abstract: | The uptake of carrier-free 137Cs by Ramalina reticulata Kremp. does not appear to be directly linked to metabolism. The results indicate the presence of a barrier to entry of 137Cs. The barrier is stabilized by Ca ions. Removal of Ca by pretreatment of the tissue in monovalent salt solutions increases the uptake of 137Cs. Uptake under anaerobiosis is also greater than normal, but in this case, Ca displaced from the barrier membrane is not lost from the tissue and normal permeability is rapidly re-established when aerobic conditions are restored. Under anaerobiosis Ca2+ increases damage to the respiratory mechanism presumably by increasing retention of toxic products. |
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