Uptake and Leakage of Some Ions in Relation to Potassium Uptake Rhythm in Lemna gibba G3
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The time courses of the uptake of various inorganic ions from the flow medium were compared with the rhythmical potassium uptake in Lemna gibba G3. The duckweeds in the flow medium absorbed 20-40% of magnesium, 30-50% of phosphate, 40-80% potassium and 50-90% of nitrate, the percentage varying rhythmically, but they constantly absorbed about 20% of calcium. The total anion uptake was 1.5 times greater than the total cation uptake. The duckweeds absorbed cesium or rubidium as well as they did potassium. They also absorbed sodium if potassium was absent from the medium. Lithium was not absorbed even in the absence of potassium. Potassium leaked from the duckweed into the potassium-free flow medium, and the rate of leakage changed diurnally under continuous light, with maximum leakage occurring at the same circadian time as when the potassium uptake rhythm in the normal flow medium drops to the minimum point. The pattern of potassium leakage in dim light was influenced by the species of monovalent cation in the medium. In darkness, however, the leakage rhythm ran for 36 hr irrespective of cation species.
- 日本植物生理学会の論文
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