THE CELL-CYCLE IN ARABIDOPSIS

Cell cycling is controlled by a complex series of events, each precise ly monitored at multiple levels. Internal and external information mus t be integrated to enable the cell to make the crucial decision whethe r to divide or not. In all eukaryotes, progression through G1, S, G2, and M phases is driven by the activation of threonine/serine-specific cyclin-dependent kinases. Because plants have unique developmental fea tures, the tuning of their cell cycle regulation must somehow be diffe rent. This review summarizes the current knowledge of the mechanisms o f cell cycle control in the model plant Arabidopsis thaliana. (C) Else vier, Paris.