Freezing plants for preservation ?

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Greetings.

Human and animal eggs and sperm are routinely frozen for preservation; and read something about fertilized embryos getting the same treatment. 

What about plants ?   Is there a way ?  Can a germinated young plant, or perhaps a grown one, be preserved until a future planting/growing season ?  Can annual plants be preserved/suspended from winter death until much later to continue their growth, other than greenhouses * ?  I know seed banks keep thousands of varieties frozen for any future needs, but are those non-germinated seeds embryos ?

This thread triggered from the uncertainty from a seed to germinate.  I see there is no way to assure success to germinate a seed even by the most expert 'green thumbs'

* Would an annual plant dying by winter season continue to thrive if transplanted to a tropical weather, or there would be a collision with its genetics from unexpected weather ?