Abstract
The storage behaviour of recalcitrant seeds was assessed using three diverse species: a gymnosperm, Araucaria angustifolia (Bert.) O. Kuntze; a herbaceous monocotyledon, Scadoxus membranaceus (Bak.) Friis Nordal; and a woody dicotyledon, Landolphia kirkii Dyer. Seeds were stored under conditions of high relative humidities that maintained seed moisture content and under low relative humidities that caused drying. At regular intervals moisture content was determined, germinability assessed and the ultrastructure of radicle meristem cells examined. Under storage at high relative humidity, seed moisture content was maintained at the original level and subcellular germination events were initiated in the short-term. Such seeds showed enhanced rates of germination when removed from storage and planted. Long-term storage under these conditions resulted in the initiation of subcellular damage which intensified with time and ultimately resulted in the loss of viability. The rate at which germination events proceeded varied among the three species, and could be directly correlated with the period of viability retention under humid storage conditions. Storage under desiccating conditions resulted in subcellular damage and rapid loss of viability. The rate at which the seeds dried varied among the three species. The proportion of water loss tolerated by the different species before loss of viability, correlated with the rate of drying. The storage behaviour of the seeds of these three species is discussed in terms of a previously described model.
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Berjak, P., Dini, M., Pammenter, N.W. (1984) Possible mechanisms underlying the differing dehydration responses in recalcitrant and orthodox seeds: desiccation-associated subcellular changes in propagules of Avicennia marina. Seed Sci. Technol. 12, 365–384
Bewley, J.D. (1979) Physiological aspects of desiccation tolerance. Annu. Rev. Plant Physiol. 30, 195–238
Chin, H.F., Roberts, E.H., eds (1980) Recalcitrant crop seeds. Tropical Press, SDN. BHD. Kuala Lumpur, Malaysia
Chin, H.F., Aziz, M., Ang, B.B., Hamzah, S. (1981) The effect of moisture and temperature on the ultrastructure and viability of Hevea brasiliensis. Seed Sci. Technol. 9, 411–422
Ching, T.M. (1972) Metabolism of germinating seeds. In: Seed biology, vol. II, pp. 103–218, Academic Press, New York
Czabator, F.J. (1962) Germination value: an index combining speed and completeness of pine seed germination. For. Sci. 8, 386–395
Dewar, J., Pammenter, N.W., Berjak, P. (1987) Effect of storage conditions on root meristem ultrastructure in seeds of Podocarpus henkelii. Proc. Electron Microse. Soc. South Afr. 17, 105–106
Drennan, P.M., Berjak, P. (1982) Degeneration of the salt glands accompanying foliar maturation in Avicennia marina (Forsskal) Vierh. New Phytol. 90, 165–176
Farrant, J.M., Berjak, P. (1983) Recalcitrance in Podocarpus henkelii. Proc. Electron Microsc. Soc. South Afr. 13, 75–76
Farrant, J.M., Berjak, P., Pammenter, N.W. (1985) The effect of drying rate on viability retention of recalcitrant propagules of Avicennia marina. S. Afr. J. Bot. 51, 432–438
Farrant, J.M., Pammenter, N.W., Berjak, P. (1986) The increasing desiccation sensitivity of recalcitrant Avicennia marina seeds with storage time. Physiol. Plant. 67, 291–298
Farrant, J.M., Pammenter, N.W., Berjak, P. (1987) The storage behaviour of some recalcitrant seeds. Proc. Electron Microsc. Soc. South Afr. 17, 109–110
Farrant, J.M., Pammenter, N.W., Berjak, P. (1988) Recalcitrance — a current assessment. Seed Sci. Technol. 16, 155–166
Hor, Y.L., Hill, M.J. (1981) Ultrastructural changes associated with seed deterioration in cocoa (Theobroma cacao). Proc. Int. Seed Testing Assoc. XIX Vienna, Austria
King, M.W., Roberts, E.H. (1979) The storage of recalcitrant seeds — achievements and possible approaches. BPGR Secretariat. Rome, Italy
Pammenter, N.W., Farrant, J.M., Berjak, P. (1984) Recalcitrant seeds: short-term storage effects in Avicennia marina (Forssk.) Vierh. may be germination-associated changes. Ann. Bot. 54, 843–846
Roberts, E.H. (1973) Predicting the storage life of seeds. Seed Sci. Technol. 1, 499–514
Tompsett, P.B. (1982) The effect of desiccation on the longevity of seeds of Araucaria hunsteinii and Araucaria cunninghamii. Ann. Bot. 50, 693–714
Tompsett, P.B. (1984) The effect of moisture content and temperature on the seed storage life of Araucaria columnaris. Seed Sci. Technol. 12, 801–816
Wettstein, R. ed. (1962) Handbuch der Systemetischen Botanik. Asher, Amsterdam
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Farrant, J.M., Pammenter, N.W. & Berjak, P. Germination-associated events and the desiccation sensitivity of recalcitrant seeds — a study on three unrelated species. Planta 178, 189–198 (1989). https://doi.org/10.1007/BF00393194
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DOI: https://doi.org/10.1007/BF00393194