Abstract
Cryopreservation of clonal plant germplasm is a reliable way to preserve important agronomic traits and protect against loss of crop genetic diversity of many horticultural species. Dormant bud cryopreservation techniques present an efficient alternative to the labor-intensive shoot tip cryopreservation process and may allow a single technician to preserve large quantities of germplasm in a season. This method of cryopreservation takes advantage of the natural dormancy in cold hardy crops, making it a viable technique for only deciduous trees and shrubs. Many factors must be considered when attempting to perform dormant bud research methods to applied-level germplasm preservation efforts. This process is necessarily a seasonal endeavor, which puts strain on labor and facilities particularly in winter. Integration of methods and procedures using different crop species or new equipment provides additional challenges that must be tested in advance. By identifying variables of dormant bud processing in cryopreservation literature, options emerge that allow for the modification of reported methods to work within the confines of institutional resources. Infrastructure, pre-processing, and recovery stages are discussed in terms of necessity and available alternatives to allow informed decision making in establishing an applied dormant budwood genebank.
Key message
This review aims to provide information about the DB cryopreservation method with a focus on its many variables and permutations reported in literature to allow genebanks and germplasm managers to make informed decisions regarding the designation of critical resources.
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Abbreviations
- DB:
-
Dormant bud(s)
- H:
-
Hours
- HQC:
-
8-Hydroxyquinoniline citrate
- LN:
-
Liquid nitrogen
- LNV:
-
Liquid nitrogen vapor
- MC:
-
Moisture content
- TTC:
-
Triphenyltetrazolium chloride
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Acknowledgements
This research was supported by Non-Assistance Cooperative Agreement no. 58-3012-5-010 titled, “Increasing Efficiency in Cryopreservation of Clonally Maintained High Priority Germplasm Collections Using Dormant Winter Bud Technology,” between the United States Department of Agriculture-Agricultural Research Service (USDA-ARS) and Colorado State University Department of Horticulture and Landscape Architecture (CSU HLA). Funding was also provided in part by the National Academy of Sciences (NAS) and USAID, and any opinions, findings, conclusions, or recommendations expressed in such are those of the authors alone, and do not necessarily reflect the views of USAID or NAS. USDA-ARS and CSU are equal opportunity employers.
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GV, JT, KC, RB and ISM conceived the concept of the manuscript. JT wrote the first draft of the manuscript and KC substantially improved it and created graphic artwork. All authors have reviewed, edited and approved the final manuscript.
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Tanner, J.D., Chen, K.Y., Bonnart, R.M. et al. Considerations for large-scale implementation of dormant budwood cryopreservation. Plant Cell Tiss Organ Cult 144, 35–48 (2021). https://doi.org/10.1007/s11240-020-01884-5
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DOI: https://doi.org/10.1007/s11240-020-01884-5