Abstract
There are root forming substances which are extracted by ether or water from leaves and stems of Portulaca, while inhibiting substances for rooting extracted by alcohole or water are detected simultaneously in leaves and stems of green color stem.
The substances extracted by ether from Portulaca decrease the root forming power of IAA, while the substances extracted by water do not.
It seems that the activity of root forming substances vary depending on the change of growing stage and environment. Particularly, flowering, cool temperature of short day act as negative factors.
The root forming power of the substances extracted from Portulaca are weaker than that of IAA of 10ppm under the room condition.
The root forming power of the ether extract is stronger than that of the water extract. The fact and other features show the extracted substances might contain the natural auxin. But, the presence of other substances besides natural auxin is doubtful within the series of this experiments.
