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Water relations of germination in the recalcitrant seeds of Quercus robur L.

  • W. E. Finch-Savage (a1) and H. A. Clay (a1)


Quercus robur L. fruits are desiccation sensitive and shed from the plant at high moisture content (c. 48%). Water relations measurements were taken at intervals during the germination of prematurely-harvested immature fruits and naturally-shed mature fruits. In fruits from both harvests the pericarp and seed coat delayed germination by providing physical barriers to emergence of the radicle and by restricting the rate of imbibition. Although immature fruits could germinate in the absence of water they germinated more rapidly in the presence of an external water supply. The fully-mature fruit required a supply of external water, but germination was more rapid than in immature fruits. Substantial physiological changes, resulting in the accumulation of solutes, and increased axis size and extensibility occurred before splitting of the pericarp and subsequent germination of immature fruits. Such changes did not occur in fully-mature fruits, but fruits, from both harvests imbibed water and splitting of the pericarp appeared to result from increased embryo size and tissue pressure. Splitting was minimal prior to germination in immature fruits without an external water supply. It is suggested that the resulting reduction in Ψp when the pericarp splits was greater in the axis than in the cotyledons because of its greater capacity for expansion. This would create a Ψw gradient driving water flow to the axis from the cotyledons allowing continued radicle growth for germination.


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Bonner, F.T. and Vozzo, J.A. (1987) Seed biology and technology of Quercus. United States Department of Agriculture, Southern Forest Experiment Station, General Technical Report SO-66.
Bradford, K.J. (1994) Water stress and the water relations of seed development: A critical review. Crop Science 34,111.
Doley, D. (1990) Utilisation of intrinsic water in the germination of Araucaria bidwillii seeds. Seed Science and Technology 18, 3342.
Farrant, J.M., Pammenter, N.W. and Berjak, P. (1988)Recalcitrance—a current assessment. Seed Science and Technology 16, 155166.
Finch-Savage, W.E. (1992a) Embryo water status and survival in the recalcitrant species Quercus robur L.: Evidence for a critical moisture content. Journal of Experimental Botany 43, 663669.
Finch-Savage, W.E. (1992b) Seed development in the recalcitrant species Quercus robur L.: germinability and desiccation tolerance. Seed Science Research 2, 1722.
Finch-Savage, W.E., Clay, H.A., Blake, P.S. and Browning, G. (1992) Seed development in the recalcitrant species Quercus robur L.: Water status and endogenous abscisic acid levels. Journal of Experimental Botany 43, 671679.
Georghiou, K., Psaras, G. and Mitrakos, K. (1983)Lettuce endosperm structural changes during germination under different light, temperature, and hydration conditions. Botanical Gazette 144, 207211.
Gibson, A. and Bachelard, E.P. (1986) Germination of Eucalyptus sieberi L. Johnson seeds. II. Internal water relations. Tree Physiology 1, 6777.
Gosling, P.G. (1989) The effect of drying Quercus robur acorns to different moisture contents, followed by storage, either with or without imbibition. Forestry 62, 4150.
Grange, R.I. and Finch-Savage, W.E. (1992) Embryo water status and development of the recalcitrant species Quercus robur L.: Determination of water relations parameters by pressure volume analysis. Journal of Experimental Botany 43, 657662.
Groot, S.P.C., Kieliszewska-Rokicka, B., Vermeer, E. and Karssen, C.M. (1988) Gibberellin induced hydrolysis of endosperm cell walls in gibberellin-deficient tomato seeds prior to radicle protrusion. Planta 172, 500504.
Haigh, A.M. and Barlow, E.W.R. (1987) Water relations of tomato seed germination. Australian Journal of Plant Physiology 14, 485492.
International Rules for Seed Testing. (1985)Determination of moisture content. Seed Science and Technology 13, 338341.
Matyssek, R., Maruyama, S. and Boyer, J.S. (1991) Growth-induced water potentials may mobilize internal water for growth. Plant Cell and Environment 14, 917923.
Pritchard, H.W. and Manger, K.R. (1990) Quantal response of fruit and seed germination rate in Quercus robur L. and Castanea sativa Mill. to constant temperatures and photon dose. Journal of Experimental Botany 41, 15491557.
Sands, R., McDonald, A.J.S. and Stadenberg, I. (1992) An evaluation of techniques for measuring yield turgor in excised Salix leaves. Plant Cell and Environment 15, 107114.
Schopfer, P. and Plachy, C. (1985) Control of seed germination by abscisic acid III. Effect on embryo growth potential (minimum turgor pressure) and growth coefficient (cell wall extensibility) in Brassica napus L. Plant Physiology 77, 676686.
Tompsett, P.B. (1987) A review of the literature on storage of dipterocarp seeds. pp 348365in Kamra, S.K. and Ayling, R.D. (Eds) Proceedings of the international symposium on forest seed problems in Africa. Umeå, Sweden, Swedish University of Agricultural Sciences.
Welbaum, G.E. and Bradford, K.J. (1990) Water relations of seed development and germination in muskmelon (Cucumis melo L.). V. Water relations of imbibition and germination. Plant Physiology 92, 10461052.


Water relations of germination in the recalcitrant seeds of Quercus robur L.

  • W. E. Finch-Savage (a1) and H. A. Clay (a1)


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