Two-step preconditioning- a feasible method for cryopreservation of Fortunella polyandra shoot tips using vitrification technique
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Chandrabalan, D.C.; Clyde, M.M.; Normah, M.N. -2011-Two-step preconditioning - a feasible method for cryopreservation of Fortunella polyandra shoot tips using vitrification technique. -ISHS 908- p. 289-296
Permanent link to cite or share this item: http://hdl.handle.net/10568/42396
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A study was conducted to develop an optimized methodology for cryopreservation of in vitro derived Fortunella polyandra shoot tips using vitrification-based techniques. Cryopreservation of F. polyandra shoot tips was successfully performed with the emphasis placed upon the aspects of preconditioning involving the pregrowth and preculture of explants. Preculture alone on Murashige and Skoog (MS) medium with 0.3 M sucrose for one day was not sufficient in giving survival after cryopreservation. A preliminary experiment involving pregrowth on MS medium with 0.72 M sucrose for three days produced a survival of 23.4% after cryopreservation. The usage of a combination of cryoprotectants in the preculture medium (MS with 0.3 M sucrose and 0.5 M ethylene glycol) proved to be beneficial in enhancing survival percentage of cryopreserved explants up to 40% when precultured for one day. However the highest percentage of shoot tip survival after cryopreservation (56.6%) was achieved when a two-step preconditioning method (pregrowth on MS medium with 0.72 M sucrose for three days followed by preculture on MS medium with 0.3 M sucrose for one day) was employed.