Studies of cryopreservarion of callus of maidenhair tree (Gingko biloba L.) Cotyledon were conducted.The relative viability of cryopreserved materials was effected by both of cryoprotectant and freezing rate.It was also important to undergo pre-growth and that material for a while at freezing to some low temperature. By pre-culturing on MS adding high concentration of sorbitol or mannitol for two days-with the combinative cryoprotectant 10% Dimethyl sulfoxide(DMSO)+ 0.5*!mol·L -1 sorbitol-slow freezing at...
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