Figure 2.

Regulation of the chloroplast division in algae and land plants. (A) The chloroplast divides once per host cell cycle in algae. Components of the chloroplast division machinery are expressed in a specific phase of the host cell cycle. (B) The rate of the chloroplast division changes during cell differentiation in land plants. In angiosperms, proplastids actively divide in the meristematic cells, while the division rate slows down as leaves and chloroplasts mature. The PDV level, but not that of the other division components, decreases in parallel with the division rate.