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Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
TURNER REVIEW

Current issues in plant cryopreservation and importance for ex situ conservation of threatened Australian native species

Robyn Streczynski A F , Hamish Clark A F , Lily M. Whelehan A F , Sze-Tieng Ang A F , Lyndle K. Hardstaff A , Bryn Funnekotter https://orcid.org/0000-0002-6825-3085 A B , Eric Bunn A B C , Catherine A. Offord D , Karen D. Sommerville D and Ricardo L. Mancera A E
+ Author Affiliations
- Author Affiliations

A School of Pharmacy and Biomedical Sciences, Curtin Health Innovation Research Institute, Curtin University, GPO Box U1985, Perth, WA 6845, Australia.

B Kings Park Science, Department of Biodiversity, Conservation and Attractions, Kings Park, WA 6005, Australia.

C School of Biological Sciences, The University of Western Australia, Crawley, WA 6005, Australia.

D The Australian PlantBank, The Royal Botanic Gardens and Domain Trust, Mount Annan, NSW 2567, Australia.

E Corresponding author. Email: R.Mancera@curtin.edu.au

F Joint first authors.

Australian Journal of Botany 67(1) 1-15 https://doi.org/10.1071/BT18147
Submitted: 30 July 2018  Accepted: 6 February 2019   Published: 20 March 2019

Abstract

An alarming proportion of Australia’s unique plant biodiversity is under siege from a variety of environmental threats. Options for in situ conservation are becoming increasingly compromised as encroaching land use, climate change and introduced diseases are highly likely to erode sanctuaries regardless of best intentions. Ex situ conservation is currently limited to botanic garden living collections and seed banking, with in vitro and cryopreservation technologies still being developed to address ex situ conservation of species not amenable to conventional storage. Cryopreservation (storage in liquid nitrogen) has been used successfully for long-term biosecure storage of shoot tips of several species of threatened Australian plants. We present a case for building on this research and fostering further development and utilisation of cryopreservation as the best means of capturing critical germplasm collections of Australian species with special storage requirements (e.g. recalcitrant-seeded taxa and species with short-lived seeds) that currently cannot be preserved effectively by other means. This review highlights the major issues in cryopreservation that can limit survival including ice crystal damage and desiccation, toxicity of cryoprotective agents, membrane damage, oxidative stress and mitochondrial function. Progress in understanding and mitigating these stresses is vital for advancing cryopreservation for conservation purposes.

Additional keywords: cryobank, cryobiology, cryobiotechnology, cryostorage, freezing, in vitro conservation, plant tissue culture, vitrification.


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