Über einen Gradienten in der Samenschale vonCrepis capillaris bei der Keimung und seine mutmaßliche Bedeutung

Summary In the seed-coat ofCrepis capillaris a gradient is formed shortly before the germination. It consists in the growth of all the cells in a small, sharply delimited area at the end around the root-tip. This process takes place under a decrease of the thickness of the walls and a consumation of the reserve materials of the cells. The rest of the cells in the shell, which can not be distinguished from the cells of the pole during and after the swelling, remain at the same time unchanged. It is supposed that the gradient causes the germination of the root prior to the cotyledones. The investigations are being continued.