THE ESTABLISHMENT OF THE PLASTID THYLAKOID SYSTEM

Summary Making use of serial thin sections of conventionally fixed tissue we have constructed a model of the thylakoid system in a pre-granal, dividing chloroplast. The three-dimensional configuration of this plastid is compared with the thylakoid configurations seen in 1μm thick sections of the zinc iodide-osmium impregnated tissue which were examined with a high voltage electron microscope. A comparison has also been made between the differential staining characteristics of the various membranous invaginations, vesicles and tubules which are frequently associated with the plastid envelope and which may play a part in development of the thylakoid system.