Abstract
Alginate beads containing axillary buds of in vitro-grown gentian (Gentiana scabra Bunge var. buergeri Maxim.), were successfully cryopreserved following 2 step-preculture with sucrose and desiccation. The optimal preculture conditions were as follows: axillary buds were excised from in vitro-grown gentian plants and precultured on semi-solid Murashige and Skoog (MS) medium containing 0.1 M sucrose for 10 days (25 °C, 16-h photoperiod) (first step). This was followed by incubation on semi-solid MS media containing 0.4 M (1 day) and then 0.7 M sucrose (1 day) (second step). After preculture, the buds were encapsulated in alginate beads and desiccated aseptically on silica gel for 9 h to a water content of 10% (fresh weight basis), followed by immersion in liquid nitrogen (LN). With this protocol, 87% of the gentian buds survived exposure to LN and showed normal development of shoots and roots in vitro and in vivo. Depletion of NH4NO3 in the regeneration medium did not improve survival following desiccation and exposure to LN. The results show that 2 step-preculture with sucrose is effectively applicable in encapsulation–desiccation based cryopreservation of gentian axillary buds. This preculture can replace the conventionally used lengthy cold-hardening treatment and is useful for routine cryopreservation of gentian germplasm.
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Abbreviations
- LN – liquid nitrogen:
-
MS medium – Murashige and Skoog (1962) medium
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Suzuki, M., Akihama, T. & Ishikawa, M. Cryopreservation of encapsulated gentian axillary buds following 2 step-preculture with sucrose and desiccation. Plant Cell Tiss Organ Cult 83, 115–121 (2005). https://doi.org/10.1007/s11240-005-4854-y
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DOI: https://doi.org/10.1007/s11240-005-4854-y