羊歯類の細胞学的研究

(三十一報) 色素体と核との関係

抄録

In the embryonic cell of a young leaf a bar-like plastid divides into two longitudinary, preceding the nuclear division, and the resulted daughter cells contain only one plastid respectively.
In the almost completed leaf a cell of the mesophyll contains a round large plastid which divides into two, but the nucleus remains as it was, without dividing.
When a cell contains many plastids as in the case of an epidermis-cell of the under-suaface of a leaf, its nucleus divides independently from the plastids. So the plastids are distributed at random into the resulted two daughter cells and the number of the plastids in each of the daughter cells soon becomes equal.
These facts show that the plastid has its individuality and that it behaves independently from the nucleus.
The expense for this study was partly defrayed by a grant from the Science Research Fund, Ministry of Education.