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Plant and Cell Physiology, 1965, Vol. 6, No. 4 699-709
© 1965

Article

ROLE OF CALCIUM IN POTASSIUM UPTAKE BY PLANT ROOTS

HIROSHI HIRATA and SHINGO MITSUI

Faculty of Agriculture, Tokyo University Bunkyo-ku, Tokyo

The effects of EDTA·Mg or GEDTA·Mg on the uptake of nutrient ions, the release of Ca++ and nucleotides into the medium and the nucleic acid contents in rice and red bean roots were investigated.

  1. Both EDTA and EDTA·Mg induced similarly the release of Ca from roots.
  2. EDTA·Mg as well as EDTA brought about a significant repression in K uptake, but had an insignificant or no effect on P, NH4 and NO3 uptakes. EDTA·Ca did not repress K, P, NH4 and NO3 uptakes.
  3. EDTA or GEDTA accelerated the degradation of nucleic acid and the release of nucleotides, while EDTA·Mg or GEDTA·Mg had no such effect.

These results indicate that the indispensable role of intracellular Ca in K uptake does not appear to be directly associated with RNA metabolism.

(Received July 29, 1965; )
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