Abstract
When suspension-cultured sycamore (Acer pseudoplatanus L.) cells are deprived of the synthetic auxin 2,4-dichlorophenoxyacetic acid (2,4-D) cell division activity ceases after a brief period of exponential growth. Feulgen microdensitometry analyses showed that sycamore cultures starved of 2,4-D do not exhibit exclusive arrest in any particular cell cycle compartment. Regrowth, following readdition of 2,4-D to 2,4-D-starved cells, produced periodic oscillations in mitotic index and discontinuous increases in cell number. Detailed characteristics of the regrowth kinetics indicated involvement of periodic, rather than synchronous, growth. The results of this study suggest that the stimulation of cell division by 2,4-D is indirect and not due to the activation of a cell cycle control point to commit cells to division.
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