Cell cycle regulation of the microtubular cytoskeleton

The microtubular element of the plant cytoskeleton undergoes dramatic archi tectural changes in the course of the cell cycle, specifically at the entry into and exit from mitosis. These changes underlie the acquisition of spec ialized properties and functions involved, for example, in the equal segreg ation of chromosomes and the correct positioning and formation of the new c ell wall. Here we review some of the molecular mechanisms by which the dyna mics and the organization of microtubules are regulated and suggest how the se mechanisms may be under the control of cell cycle events.