Abstract

Protoplasts isolated from calli ofNicotiana plumbaginifolia can dramatically increase in volume without showing indications of cell wall synthesis. After reaching a critical size, the plasma-rich giant protoplasts show multiple formation of cytoplasts, which are released from the mother cells. The anucleate cytoplasts display the same increase in size as the nucleate protoplasts. Both cell types retain a spherical shape for several months, indicating that no major synthesis of cell wall occurred.

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