proplastid
Noun
Meaning
proplastid (plural proplastids)
(cytology) A small, colourless cell that develops into any form of plastid
Examples
Whether a proplastid develops into a chloroplast some other kind of plastid is mostly controlled by the nucleus and is largely influenced by the kind of cell it resides in. Many plastid interconversions are possible.
Light, however, does not guarantee that a proplastid will develop into a chloroplast.
There is no proplastid differentiation—when an algal cell divides, its chloroplast divides along with it, and each daughter cell receives a mature chloroplast.