Criopreserva??o de sementes de tabaco condicionadas fisiologicamente

摘要

Priming is a commercial technique used to increase the speed and uniformity of seed germination. However, the physiological quality of primed seeds is usually negatively affected during storage. Tobacco seeds of the cultivar BAT 2101 were used to investigate whether primed seeds could be cryopreserved. The most suitable substances, type of drying, and reheating during priming and cryopreservation of tobacco seeds were studied. Seed priming was performed with water, spermidine, and potassium nitrate, and drying was carried out with silica gel and a saturated saline solution. Seeds were cryopreserved in liquid nitrogen for 24 h and reheated in a water bath for two and five minutes and at ambient temperature. Tobacco seeds primed with spermidine and water can be cryopreserved without loss of physiological quality when quickly dried on silica gel and reheated in a water bath for two minutes.