Why a seed bank is more than a freezer full of seeds
Preserving crop diversity requires documentation, testing and renewal, with different plants needing different conservation methods.
Explainer
Explainer: A seed bank preserves living material that may be useful to farmers, plant breeders and researchers. Low-temperature storage is part of the work, but a collection also needs reliable records and checks that its seeds can still germinate.
Many crops produce what scientists call orthodox seeds, which tolerate drying and cold storage. Other plants cannot be conserved in the same way. Their genetic resources may need living field collections, laboratory culture or carefully designed cryopreservation methods.
FAO’s genebank standards describe a chain of tasks: collecting material, drying and storing it, monitoring viability, regenerating seed stocks, documenting characteristics and maintaining safety duplicates. If a sample loses viability, its label and physical presence alone cannot preserve a living resource.
The Crop Trust’s account of Uganda’s national genebank illustrates the distinction. It describes dried seed collections stored in freezers and non-orthodox species maintained as living plants in the Entebbe Botanic Gardens. Different biological needs lead to different storage systems.
Backup collections add another layer of protection. Seeds deposited at the Svalbard Global Seed Vault come from established genebanks, while material for research and breeding remains available through the original collections. The system is therefore a network of working institutions, rather than one vault supplying every seed. Its purpose is to keep a wide range of crop diversity alive and usable so that future users have options that would otherwise be difficult to replace.
