Inclusion bodies found in proplastids and immature chloroplasts which possibly play a role in thylakoid formation are described. These include membrane-bound bodies, the bounding membrane of which is continuous with those of the grana and striated osmiophilic droplets whose over-all morphology bears a resemblance to grana stacks. It is suggested that both inclusions contain precursor molecules for membrane synthesis and that they may be actual sites of thylakoid formation.
No takes yet. Share an insight, caveat, or question.
Cran et al. (1974) studied this question.