02404naa a2200229 a 450000100080000000500110000800800410001910000210006024501410008126000090022252016750023165000230190665300240192965300250195365300170197865300260199565300170202170000250203870000220206370000170208577300720210221142032019-11-12       2019    bl uuuu     u00u1 u    #d1 aCOELHO, S. V. B.  aCryopreservation of Coffea canephora Pierre ex A. Froehner seedsbimportance of drying rate and moisture content.h[electronic resource]  c2019  aSeeds of the Coffea canephora species are considered more recalcitrant than those of the Coffea arabica species. They tolerate partial dehydration and they cannot be stored in conventional seed banks at -18ºC because they are sensitive to freezing temperatures. Cryopreservation is a reliable method for storing seeds with these characteristics for long periods. However, preliminary studies are necessary to determine ideal storage conditions. The aim of this study was to investigate the ideal physical and physiological conditions for cryopreservation of Coffea canephora seeds to reduce seed mortality caused by the formation of intracellular ice crystals and to avoid cell damage caused by excessive desiccation. Seeds were subjected to rapid drying in silica gel and slow drying in saturated NaCl solution to moisture contents of 0.20, 0.25, and 0.28 g.g-¹ (dry basis), followed by direct immersion in liquid nitrogen for rapid freezing. Physiological and biochemical analyses were performed to evaluate seed quality before and after cryopreservation. Rapid drying of Coffea canephora seeds to values near 0.20 g.g-1 (db) does not cause reduction in physiological quality. Moisture content of 0.25 g.g-¹ brings about greater survival of Coffea canephora seeds after cryopreservation. Drying rate affects the physiological quality of cryopreserved Coffea canephora seeds, and rapid drying in silica gel is more favorable than slow drying in a saturated NaCl solution. The activity of the enzymes catalase, esterase, glutamic oxaloacetic transaminase, and polyphenol oxidase are indicators of seed quality for Coffea canephora seeds subjected to cryopreservation.  aRecalcitrant seeds  aAntioxidant enzymes  aDrying in silica gel  aIce crystals  aPhysiological quality  aRapid drying1 aROSA, S. D. V. F. da1 aFANTAZZINI, T. B.1 aSILVA, L. C.  tAustralian Journal of Crop Sciencegv.13, n. 8, p. 1335-1342, 2019.