Pollen grains can be stored for several years in liquid nitrogen having a temperature of

Pollen grains of plants with desirable characters can be stored for several years in liquid nitrogen at – 196⁰C.  Cryopreservation of pollen gains involves freezing them at ultra-low temperatures, typically using liquid nitrogen. This preservation method ensures longterm viability and genetic stability, and it facilitates storage and exchange of valuable genetic material for plant breeding and conservation purposes.

(1), (2), (4) These temperatures are not related to cryopreservation.