ROLE OF CALCIUM IN POTASSIUM UPTAKE BY PLANT ROOTS |
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Authors: | HIRATA HIROSHI; MITSUI SHINGO |
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Institution: | Faculty of Agriculture, Tokyo University Bunkyo-ku, Tokyo |
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Abstract: | The effects of EDTA·Mg or GEDTA·Mg on the uptakeof nutrient ions, the release of Ca++ and nucleotides into themedium and the nucleic acid contents in rice and red bean rootswere investigated. - Both EDTA and EDTA·Mg induced similarly the release ofCa from roots.
- EDTA·Mg as well as EDTA brought abouta significant repressionin K uptake, but had an insignificantor no effect on P, NH4and NO3 uptakes. EDTA·Ca did notrepress K, P, NH4 andNO3 uptakes.
- EDTA or GEDTA acceleratedthe degradation of nucleic acid andthe release of nucleotides,while EDTA·Mg or GEDTA·Mghad no such effect.
These results indicate that the indispensable role of intracellularCa in K uptake does not appear to be directly associated withRNA metabolism. (Received July 29, 1965; ) |
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