Tea, coffee and mango seed can not be conserved in seed bank because their drastic loss in viability in moisture content below

Tea, coffee, and mango seed cannot be conserved in seed banks because of their drastic loss in viability in moisture content below 12%.
A seed bank stores seeds to preserve genetic diversity; hence it is a type of gene bank. One is to preserve the genes that plant breeders need to increase the yield, disease resistance, drought tolerance, nutritional quality, taste, etc. of crops.
Seeds are living plants and keeping them viable over the long term requires adjusting storage moisture and temperature appropriately. As they mature on the mother plant, many seeds attain an innate ability to survive drying.