I know there is a relationship between the moisture of the seed and the heat of the store, but I look for the maximum degree of cold that can be borne by the seed
I think it's -18 degrees C
Saddam,
A 10 sec Google reveals this:
https://naldc.nal.usda.gov/download/42490/PDF
TLDR: Lettuce seeds (and perhaps many other plants) tolerate cryogenic temperatures for decades. Note figure 3 and the Avrami function.
http://agron-www.agron.iastate.edu/courses/Agron338/Content/Seed%20storage%202013.pdf
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