On the current of rest in the growing bud in the stem of sweet-potatoes.

[摘要] The present investigations are concerned with following question: a. By what way does the hight effect on the process of the root formation of potatoes ? b. How does a variation in the intensity of light affect the magnitude of the longitudinal electrical polarity ? The electrical measurements were taken at every 5 milimeters betwen apex of lateral bud and root tip. The contact on the upper side was connected to the stem, and the contact on the lower side was used as the variable. This method and materials must be well adapted to this special test. The data represented by the Curves (Fig 2-Fig 4) demonstrate the following facts: This magnitude of the electrical response is dependent on the intensity of light stimulation applied. The electrical polarity is established prior to the unequal distribution of the growth hormon. Increase in the electric polarities is associated with a steady progress in ripening of the root primordia. This increase in polarities is thought to be brought about by nuclear activities leading to cell division. In the evaluation of our data it should be considered that the zone of endogrowth gets into the base of root from the apex of bud at the very early stage.

[学科分类] 农业科学（综合）