Molecular Mechanisms Underlying Freezing Tolerance in Plants: Implications for Cryopreservation

Area of Science:

• Plant Science
• Cryobiology
• Conservation Biology

Background:

• Cryopreservation is essential for long-term ex situ conservation of plant genetic resources amidst global biodiversity decline.
• Established techniques include slow freezing, vitrification, and encapsulation-based methods, developed over seven decades.
• Understanding molecular mechanisms of plant freezing tolerance is critical for advancing cryopreservation.

Purpose of the Study:

• To review current cryopreservation techniques for plant genetic resources.
• To highlight molecular mechanisms underlying plant freezing tolerance.
• To identify challenges and future research directions for cryopreservation.

Main Methods:

• Review of cryopreservation techniques (slow freezing, vitrification, encapsulation dehydration, encapsulation-vitrification, droplet vitrification, cryo-plates, cryo-mesh).
• Exploration of molecular mechanisms: cold acclimatization, ICE-CBF-COR pathway, transcription factors, non-coding RNAs, epigenetic modifications.
• Discussion of protective proteins: antifreeze proteins (AFPs) and late embryogenesis abundant (LEA) proteins.

Main Results:

• Diverse cryopreservation methods exist, but standardization remains a challenge, especially for tropical/subtropical species.
• Molecular insights reveal complex freezing tolerance mechanisms involving gene regulation and protective proteins.
• Omics technologies offer potential for improving cryopreservation efficacy.

Conclusions:

• Cryopreservation is a powerful tool for plant genetic resource conservation.
• Further research into molecular processes and integration of omics technologies are crucial for enhancing cryopreservation effectiveness.
• Improved cryopreservation techniques are vital for global biodiversity conservation efforts.