The Development of Cells in the Growing Zones of the Root

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Abstract
Data are presented which show the change in volume, dry weight, respiration, and protein content of the cell during development from the meristematic to the mature fully extended state. The data have been obtained by making serial sections of known thickness along the root, making the relevant observations on the sections, and relating the values obtained to the total number of cells in the sections. An apparatus is described for obtaining serial sections from a group of roots. It is shown that the weight of the wall, the protein content, and respiration all increase during extension, and the increases during active growth with respect to respiration and protein content occur in two phases. In the first the increases are large per unit increment in volume; in the second they are relatively smaller. When extension ceases a third phase in the development of the cell sets in in which respiration and protein content decrease slightly. The data show that the protein content and the respiration in the meristematic cell are considerably lower than they are in fully vacuolated cell.

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