Studies on Chlorella protoplasts

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Abstract
Protoplasts of Chlorella saccharophila (Krüger) Nadson were obtained by cellulase digestion of the microfibrillar inner compount of the cell wall after the resistant outermost layer had been scratched with sea sand. The absence of the cell wall was demonstrated immunologically, electron microscopically and by staining, thus confirming the protoplastic nature of the treated cells. After transfer to an enzyme-free medium regeneration of a thin cell wall was observed. The regeneration of the cell wall obviously followed the same steps as does the cell wall development of the autospores. At least 50% of the protoplasts were able to form colonies when plated on a suitable agar medium.