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Journal of Experimental Botany, Vol 50, 1359-1364, Copyright © 1999 by Oxford University Press

ARTICLES

Water content, lipid deposition, and (+)-abscisic acid content in developing white spruce seeds

D Carrier, E Kendall, C Bock, J Cunningham and D Dunstan
Plant Biotechnology Institute, National Research Council of Canada, 110 Gymnasium Place, Saskatoon, Saskatchewan, Canada S7N 029; Present address: Department of Medical Imaging, University of Saskatchewan, Saskatoon, SK, S7N 028, Canada; Present address: Horticulture Research International, Department of Crop Science, East Malling, West Malling, Kent ME19 6BJ, UK; Corresponding author at: Department of Agricultural and Bioresource Engineering, 57 Campus Drive, University of Saskatchewan, Saskatoon, SK, S7N 5A9, Canada

Whole seeds, and isolated megagametophytes, seed coats and embryos from white spruce [Picea glauca (Moench) Voss] were used to monitor water distribution by magnetic resonance microimaging, lipid composition by gas chromatography, and (+)-abscisic acid content ((+)-ABA) by enzyme-linked immunsorbent assay, during seed development. The highest (+)-ABA content was detected in the female gametophytic tissue, this at 11 d after pollination (DAP). Reserve deposition was evident up to 59 DAP in the female gametophyte and in the developing embryo. The maturation drying period occurred between 59 DAP and 93 DAP. At 59 DAP, the seed contained 24% water (gwater/gwet weight), and within a 34 d period, the water content declined to 6% water (gwater/gwet weight). (+)-ABA concentrations in developing seeds varied between 10 and 31 M. The decrease in water content accounted for the higher (+)-ABA concentrations.Key words: Abscisic acid, conifer seed development, fatty acids, magnetic resonance microimaging.
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