Cryopreservation of Digitalis lanata Shoot Tips

Area of Science:

• Plant Biotechnology
• Cryobiology
• Horticulture

Background:

• Effective preservation of plant genetic resources is crucial for biodiversity conservation and crop improvement.
• Cryopreservation offers long-term storage of plant material at ultra-low temperatures, preventing genetic erosion.

Purpose of the Study:

• To develop and describe a reliable cryopreservation protocol for D. LANATA shoot tips (meristems).
• To evaluate the efficacy of liquid nitrogen preservation for D. LANATA germplasm.

Main Methods:

• Shoot tips were hardened, treated with cryoprotectants (2 mol DMSO/L for 2 h), and subjected to either ultra-rapid or slow cooling.
• Storage was at -196°C in liquid nitrogen, followed by specific rewarming protocols.
• Regeneration was achieved on a solidified nutrient medium with 2.5 µmol BA/L.

Main Results:

• A high survival rate of approximately 70% was achieved post-cryopreservation.
• Approximately 30% of the cryopreserved D. LANATA shoot tips successfully regenerated into new shoots.
• The protocol demonstrated the viability of both ultra-rapid and slow cooling methods.

Conclusions:

• The described method provides an effective means for the long-term preservation of D. LANATA germplasm.
• Cryopreservation in liquid nitrogen is a viable strategy for maintaining the genetic integrity of D. LANATA.
• Successful regeneration indicates the potential for reintroducing preserved D. LANATA material into cultivation.