Abstract
In the first experiment, P* and Ca* were applied to the vines having two bearing shoots (Black Queen variety) through nutrient solution for any of the two week periods: from July 5 to 18, July 19 to Aug. 1, Aug. 1 to 15, or Aug. 16 to 29. The distribution of P and Ca in the various parts of vines were examined on the samples taken on September 30.
In the second experiment, the radioactive elements were applied to the vines during the period from June 20 (flowering period) to July 3. Then the plants were taken on July 3, 27, August 9 and September 15, and radioactivity in various parts was measured.
The results showed that the pattern of distribution of radioactivity in various parts of vines differed according to the time of its application. High activity was found in the seeds when the radioactive elements were applied early in the season, while the later the time of their application, the higher the activity in the leaves and roots.
It was found that the P moved from older leaves towards top of shoot where metabolism was more active, as shoots elongated, Ca*, however, seemed to remain in the older leaves.
Autoradiograph showed that P* was located intensively in the veins of leaves, while Ca* was dispersed in the mesophyll. These phenomena seem to be relating to the difference in their roles in the vine.
