Abstract
The role of protein synthesis in onion root tips during mitosis has been studied, by using synchronous cell populations. Incubation in cycloheximide (CHM) or anisomycin during early or middle prophase induces the return of these cells to interphase. Therefore, it is suggested that essential proteins are synthesized, which determine the continuation of the cells in mitosis. In late prophase these treatments caused a certain delay in the entry into further stages, suggesting that a protein synthesis probably occurs which determines the duration of the transition from metaphase to anaphase. Mitotic processes which develop after metaphase do not seem morphologically dependent on protein synthesis, in spite of the fact that one of them, the nucleolar reconstruction, is markedly dependent on RNA synthesis. Unexpectedly this reorganization increases its rate in the absence of protein synthesis.
Published Version
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