Cryopreservation of protoplasts isolated from thalli of Porphyra yezoensis form. narawaensis
1997
Fujiyoshi, E. (Seikai National Fisheries Research Inst., Nagasaki (Japan)) | Yamasaki, M. | Kobayashi, M. | Umezawa, S. | Kito, H.
In order to develop a method for long-term storage, protoplasts isolated from thalli of Porphyra yezoensis form. narawaensis were frozen using a two-step procedure with an initial slow cooling rate (1 degrees C/min) to -40 degrees C followed by a rapid cooling rate when samples were plunged into liquid nitrogen. The addition of 0.7M mannitol as a cryoprotectant and prefreezing treatment were necessary for successful cryopreservation. About 70% of the protoplasts were alive after the freeze-tha
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