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Journal of Experimental Botany, Vol. 51, No. 347, pp. 1159-1162, June 2000
© 2000 Oxford University Press

Short Communication Papers

Changes in abscisic acid content and embryo sensitivity to (+)-abscisic acid during the termination of dormancy of yellow cedar seeds

Nancy Schmitz1, Suzanne R. Abrams2 and Allison R. Kermode1,3

1 Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada
2 Plant Biotechnology Institute, National Research Council of Canada, 110 Gymnasium Place, Saskatoon, SK S7N 0W9, Canada

Abstract

Yellow cedar seeds are dormant at maturity. The abscisic acid (ABA) content of the embryo (but not the megagametophyte) decreased approximately 2-fold following exposure of seeds to a dormancy-breaking treatment; this process was also accompanied by a 10-fold lowered sensitivity of the embryo to S-(+)-ABA. A decline in ABA within the seed is not sufficient for dormancy breakage; reduced embryo sensitivity to ABA is also required.

Key words: Coat-imposed dormancy, embryo, megagametophyte, abscisic acid, seed germination, yellow cedar.


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