Cyclization or cytoplasmic streaming is a term that describes the movement of chloroplasts within plant cells.
They push, slide, and dart inside the cell, often catching on the edge of the cell, but sometimes appearing to fill the cell completely with constant movement. This movement is common inside cells and is called cyclonic or cytoplasmic flow.
Chloroplasts migrate in response to varying light intensities. Under low light, chloroplasts cluster in illuminated areas to maximize the rate of light absorption and photosynthesis (storage reaction). In contrast, chloroplasts escape intense light to avoid photodamage (avoidance response).
This idea is motivated by the fact that chloroplasts have their own DNA, separate from plant cells. However, over time, this bacterium becomes dependent on plant cells and vice versa, unable to survive or replicate itself could not proliferate.
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