Cryopreservation in Plant Biotechnology and Seed Banks

When we think of cryogenic storage at an extreme -196 °C, our thoughts usually turn straight to human medicine, stem cells, or reproductive biology. Yet far away from livestock breeding and fertility clinics, one of the most vital missions of our time is taking place in this freezing realm: the preservation of global plant diversity.

Faced with climate change, progressive habitat loss, and the depletion of agricultural monocultures, agricultural sciences and conservation face immense challenges. Traditional methods often reach their limits here. The solution? Plant cryopreservation—and highly specialized Dewars that secure the survival of our flora in deep stasis.

Conventional gene banks typically store seeds in cold storage facilities at temperatures between -20 °C and +4 °C. This works exceptionally well for many cereal varieties or wild plants. However, this system has two major drawbacks:

• The Problem of Orthodox vs. Recalcitrant Seeds: Many plants (including essential crops like cocoa, coffee, mango, avocado, many tropical tree and fruit species, as well as aquatic plants) produce what are known as recalcitrant (desiccation-sensitive) seeds. They perish when stripped of moisture and cannot be stored in conventional cold rooms.

• Vegetatively Propagated Plants: Plants such as bananas, potatoes, garlic, or strawberries are propagated vegetatively (via cuttings, tubers, or tissue cultures) rather than through seeds. Seeds frequently fail to inherit the genetic traits of the mother plant.

This is where plant biotechnology steps in: by extracting tiny shoot tips (meristems) or embryonic tissue and storing them in liquid nitrogen (LN2), these genetic treasures can be preserved indefinitely and free from aging processes.

Freezing living plant tissue is a science in its own right. Because plant cells consist largely of water, conventional freezing would cause ice crystals to form, destroying cellular structures like microscopic shards of glass.

To prevent this, modern laboratories utilize highly precise protocols:

• Dehydration and Vitrification: The tissue is treated with specialized cryoprotectants (protective solutions). The goal is vitrification—a process in which water transitions into a glass-like, amorphous state entirely free of damaging ice crystals.

• The Leap into the Dewar: Once optimally prepared, the tissue is placed in small cryo-vials and transferred into a Dewar container filled with liquid nitrogen. At -196 °C, all metabolic activity and biological aging come to a complete standstill. The DNA remains absolutely unchanged over decades or even centuries.

• Regeneration: After retrieval, the tissue is gently thawed and cultivated in nutrient media. From a tiny, deep-frozen shoot tip, a complete and healthy plant grows in the laboratory.

International institutions (such as the Leibniz Institute of Plant Genetics and Crop Plant Research or the Crop Trust network) utilize cryogenic procedures as an ultimate safety net. Should a plant species face extinction in the wild or on fields due to disease, extreme weather, or natural disasters, a genetic "twin" exists inside the Dewar container to secure the species' survival.

Because many fruit trees and crops are propagated through grafting, preserving clones via seeds is impossible. The cryopreservation of shoot tips in Dewars is globally the sole method to protect rare, heritage apple varieties, coffee cultivars, or cocoa variants from extinction—thereby safeguarding the flavor and resilience of our future food supply.

Botanical gardens and conservation organizations store not only crops but also endangered wild flora. When habitats (such as rainforests or wetlands) are destroyed, the cryobank acts as a biological ark, enabling the future restoration of ecosystems.

Just as in human medicine, the success of plant cryopreservation depends among other things on the quality of the containers used.

• Long-Term Stability: Because genetic material in gene banks is often stored untouched for decades, Dewars must exhibit an exceptionally low evaporation rate to keep the liquid nitrogen level constant.

• Specialized Racking Systems: Plant laboratories frequently handle an enormous variety of samples. Sophisticated interior structures (canisters and boxes) within the Dewars ensure that every plant lineage is precisely documented and retrieved without temperature loss.

• Contamination Safety: Modern laboratory Dewars prevent direct contact between liquid nitrogen and the samples (storage in the vapor phase just above the nitrogen), eliminating the risk of cross-contamination via microorganisms suspended in the liquid nitrogen.

Cryopreservation in plant biotechnology is far more than a niche botanical topic; it is a strategic building block for the future of our planet. It secures humanity's food supply, preserves the natural genetic diversity, and protects the heritage of our forests and fields from irreversible loss.

Behind every successful project dedicated to preserving rare plant species stands a state-of-the-art, dependable Dewar container—the silent guardian of a frozen yet living future.

Whether for long-term preservation of valuable plant tissue cultures, safe sample transport, or daily laboratory use, the integrity of your cryogenic samples depends among other things on the quality and reliability of your containers.

Our product range includes state-of-the-art Dewar vessels and cryogenic storage systems specifically engineered for the highest demands in science, biotechnology, and agriculture.

Discover our selection of cryogenic containers or speak with our expert team for a customized consultation tailored to your facility's needs.

Cryonos – Your Expert Partner for High-Quality Cryogenic Solutions.

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