Abstract
Key message
Three wild species exhibited a significant reduction in antioxidants throughout the cryopreservation protocol, whilst the half-cell reduction potential became more oxidised. Antioxidant content recuperated in recovering shoot tips.
Abstract
Cryopreservation is the most efficient and cost-effective long-term storage solution for the conservation of a wide range of plant species and material. Changes in the levels of antioxidants during the process of cryopreservation are known to reduce post-cryogenic survival due to oxidative stress. Low-molecular-weight thiols (cysteine, γ-glutamylcysteine, and glutathione) and ascorbic acid, which represent the two major water-soluble antioxidants in plants, were analysed at specific stages during cryopreservation of shoot tip material of three native Australian plant species [Anigozanthos viridis (Haemodoraceae), Lomandra sonderi (Asparagaceae), and Loxocarya cinerea (Restionaceae)] to quantify the oxidative stress experienced during cryopreservation. Post-cryogenic regeneration of shoot tips was greatest in A. viridis (78%) followed by L. sonderi (50%), whilst L. cinerea did not show any post-cryogenic regeneration. The application of a 3-week cold (5 °C) preconditioning regime, commonly used to increase post-cryogenic survival, resulted in significantly lower post-cryogenic regeneration for A. viridis (33%), but had little effect on the other two species. Total antioxidant concentration in shoot material decreased significantly with each step throughout the cryopreservation process, particularly in the cryoprotection and washing stages. Antioxidant levels in shoot tips then increased during the subsequent 7-day post-cryopreservation recovery period, with the greatest increase measured in A. viridis. Concentrations of thiols and their corresponding disulphides were used to calculate the corresponding half-cell reduction potentials, whereby the ability of these plant species to maintain a strong reducing environment in shoot tissues throughout the cryopreservation protocol was found to correlate with post-cryogenic survival.
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Abbreviations
- AsA:
-
Ascorbic acid
- BM:
-
Basal medium
- CPAs:
-
Cryoprotective agents
- Cys:
-
Cysteine
- DW:
-
Dry weight
- FW:
-
Fresh weight
- GSH:
-
Glutathione
- GSSG:
-
Glutathione disulphide
- γ-Glu-Cys:
-
Gamma-glutamylcysteine
- LMW:
-
Low molecular weight
- LN:
-
Liquid nitrogen
- ROS:
-
Reactive oxygen species
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Acknowledgements
The authors acknowledge the Australian Research Council (Grants LP0884027 and LP140100993) and generous support from Alcoa of Australia Ltd. The Royal Botanic Gardens, Kew receives grant-in-aid from Defra, UK. BF was recipient of an Australian Postgraduate Award and MERIWA scholarship.
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Communicated by Emmanuel Guiderdoni.
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Funnekotter, B., Colville, L., Kaczmarczyk, A. et al. Monitoring of oxidative status in three native Australian species during cold acclimation and cryopreservation. Plant Cell Rep 36, 1903–1916 (2017). https://doi.org/10.1007/s00299-017-2204-2
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DOI: https://doi.org/10.1007/s00299-017-2204-2