【摘要】A procedure was studied on cryopreservation of Photinia serrulata shoot-tips in vitro by vitrification. The excised shoot-tips which were cultured for 30 d, 1.5～2.0 mm long, were loaded with 60% PVS_2 for 40 min at room temperature in effendoff tube, then were exposed to PVS_2 at 0 ℃ for 50 min. Fol...