Abstract
Conditions were standardized for the isolation and culture of protoplasts from an embryogenic cell suspension culture of Picea glauca. A combination of 0.5% Cellulase R-10, 0.25% Macerozyme, 0.25% Driselase, 0.25% Rhozyme HP-150 with 0.5M mannitol and 5 mM CaCl2.2H2O produced an average of 4.5 × 10(6) protoplasts per gram fresh weight of cells. Of the several protoplast culture media tested, von Arnold and Eriksson and Kao and Michayluk (KM8P) media best supported mitotic divisions of protoplasts. A density of 10(5) protoplasts per ml and the addition of 5 mM glutamine to the culture medium was necessary to induce sustained divisions and microcallus formation. Microcalli grew into subculturable callus using a nurse culture technique.
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