Monitoring of oxidative status in three native Australian species during cold acclimation and cryopreservation

Bryn Funnekotter, Louise Colville, Anja Kaczmarczyk, Shane R. Turner, Eric Bunn, Ricardo L. Mancera

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1903-1916
Number of pages14
JournalPlant Cell Reports
Volume36
Issue number12
DOIs
Publication statusPublished - 1 Dec 2017

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