CRYOPRESERVATION OF Lilium candidum GERMPLASM: ANALYSIS OF PRE- AND POST-FREEZE TREATMENTS

Abstract

BACKGROUND: Lilium candidum L. is a perennial ornamental plant that has various medicinal properties and is used in the cosmetic industry. The species is facing threats from urbanization and climate change and requires urgent protection. The most secure and efficient technology for the long-term storage of plant genetic resources is cryopreservation, which involves preserving genetic material at extremely low temperatures. OBJECTIVE: Today, plant biodiversity is endangered because of the narrowing of its natural distribution areas and/or destruction for different purposes. This study concentrated on creating a cryopreservation process using shoot tips and calluses as explant sources for the long-term conservation of L. candidum species. MATERIALS AND METHODS: Populations of L. candidum naturally distributed from three different regions of Turkey (Kepsut, Balikesir; the area surrounding Bafa Lake, Aydın; and Fethiye-Muğla) were grown in vitro to supply shoot tip and callus explants. Prior to freezing by droplet-vitrification and vitrification techniques, shoot tips and calluses were treated with MS nutritional medium supplemented with 0.4 M sucrose 7 g/L agar and plant vitrification solution 2 (PVS2). RESULTS: Cryopreserved shoot tips showed the highest levels of regeneration (71.8%) after a PVS2 treatment of 90 min, while calluses showed the highest levels of regrowth (63.9%) after a PVS2 exposure of 60 min. CONCLUSION: High levels of regrowth are produced when the various cryopreservation procedures described here are used to preserve both shoot tip and callus explants. This potentially makes the method promising for the long-term preservation of endangered L. candidum varieties. © CryoLetters, editor@cryoletters.org.