Very interesting to note, given that there are groups of pollen and seeds who have the "if it dries it dies" issue. Things like these are important to note for various species since in some cases dried pollen may perform better, and also how to store "humid" pollen (or seeds!) for long periods. It never ceases to amaze me that what won't work at "regular" freezer temperatures (due to ice crystals forming and fracturing cells maybe??) may work at -80. -80 is also significantly cheaper (and safer) to work with than liquid nitrogen!
Kinda makes me wonder if that would work with the seeds too? Were the pollen samples ever tested for (length of) viability at other temperatures? Forgive me if there are good references about this already, my attempts to look into the subject found little to no information on tropical species that can't be dried other than "use fresh".
Best, Corey
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