Cryopreservation of encapsulated shoot primordia induced in horseradish (Armoracia rusticana) hairy root cultures |
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Authors: | M Phunchindawan K Hirata A Sakai K Miyamoto |
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Institution: | (1) Environmental Bioengineering Laboratory, Faculty of Pharmaceutical Sciences, Osaka University, 1-6, Yamadaoka, 565 Suita, Osaka, Japan;(2) Asabu-cho, 1-5-23, 001 Kita-ku, Sapporo, Japan |
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Abstract: | Shoot primordia induced inArmoracia rusticana Gaertn. Mey. et Scherb. (horseradish) hairy root cultures were successfully cryopreserved by two cryogenic procedures. Encapsulated shoot primordia were precultured on solidified Murashige-Skoog medium supplemented with 0.5M sucrose for 1 day and then dehydrated with a highly concentrated vitrification solution (PVS2) for 4 h at 0°C prior to a plunge into liquid nitrogen. The survival rate of encapsulated vitrified primordia amounted to 69%. In a revised encapsulation-dehydration technique, the encapsulated shoot primordia were precultured with a mixture of 0.5M sucrose and 1M or 1.5M glycerol for 1 day to induce dehydration tolerance and then subjected to air-drying prior to a plunge into liquid nitrogen. The survival rate of encapsulated dried primordia was more than 90%, and the revived primordia produced shoots within 2 weeks after plating. A long-term preservation of shoot primordia was also achieved by the technique. Thus, this revised encapsulation-dehydration technique appears promising as a routine method for the cryopreservation of shoot primordia of hairy roots.Abbreviations
PVS2
Vitrification solution
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LN
liquid nitrogen
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BA
6-benzyladenine
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NAA
-naphthalene-acetic acid
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MS
Murashige and Skoog (1962) medium |
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Keywords: | Cryopreservation Encapsulation-dehydration Encapsulation-vitrification Hairy roots Horseradish shoot primordia |
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