Correlation between Potassium Uptake Rhythm and Nitrate Uptake Rhythm in Lemna gibba G3
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The potassium and nitrate uptake rhythms in Lemna gibba G3 were compared under various light and medium conditions. Under light intensities ranging from 500 to 4,200 lux, the amplitudes of both rhythms were nearly the same, although the nitrate uptake activity contained a considerable arrhythmic component. The nitrate uptake rhythm was not affected by lowering of potassium concentration or substituting potassium with other cations. The potassium uptake rhythm persisted in the absence of nitrate with a reduced amplitude and an advanced phase. Duckweeds cultured on molybdenum-free medium showed the potassium uptake rhythm but no nitrate uptake rhythm; those cultured on nitrate-free medium also showed a potassium uptake rhythm. These results suggest that the potassium and the nitrate uptakes in the duckweed are not linked together by a common ion permeating system in the cell membrane, but are separately controlled by the oscillator.
- 日本植物生理学会の論文
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