Abstract
Protoplasts were isolated from suspension cultures of various cell lines of Duboisia myoporoides R. Br. There were differences among cell lines with respect to optimal conditions for protoplast isolation including the amount and kind of enzymes and the osmoticum concentration. Protoplasts isolated from one cell line were successfully cultured and induced to form cell colonies in liquid modified B5 medium. Addition of conditioned medium, coconut milk and glucose as an osmoticum to protoplast culture medium as well as maintenance of high protoplast density in culture (> 10 5/ml) were essential to obtain protocolony formation. Reduction of osmoticum concentration and deletion of coconut milk and conditioned medium from the culture medium were necessary to allow further colony development leading to cellus formation. Intact plants regenerated from calli derived from protoplasts were successfully transferred to pots.
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