Abstract
The conditions for protoplast isolation and reversion inPleuro tus sajor-caju were determined. Spherical, osmotically sensitive protoplasts were released from the mycelia through the action of Novozym 234 and cellulase CP in a suitable osmotic solution. A maximum protoplast yield was obtained from young mycelia at an early exponential growth phase by the use of 0.6 mol/l MgSC4 in a 0.01 mol/l phosphate buffer at pH 5.0. Mannitol appeared to be more suitable forPleurotus protoplast reversion. Two patterns of morphological development of the protoplasts were observed in the osmotic liquid medium. The reversion frequency was, however, low at 4–5%. There appeared to be no significant difference in the reversion frequencies of the protoplasts grown on the complete medium and on the minimal medium.
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