Abstract
In order to compare the cell volume of the natural polyploids with that of the artificial polyploids, the length of guard cells of the stomata of polyploids in higher plants were compared. In this study the data which have been reported by many authors were used. The results obtained are as follows.
1. (a) The length of guard cells of the natural autopolyploids is smaller than that of the artificial autopolyploids; in triploids 14%, in tetraploids 18%, in hexaploids 35% and in octaploids 22%. (b) The length of guard cells of the natural allopolyploids is smaller than that of the artificial allopolyploids; in tetraploids 18% and in hexaploids 29%. From these facts it follows that the cell volume of natural polyploids is smaller than that of artificial polyploids.
2. In the natural polyploids the increase rate of cell volume is similar to or smaller than the increase rate of nuclear quantity. But in the artificial polyploids the increase rate of cell volume is larger than the increase rate of nuclear quantity.
