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Plant and Cell Physiology, 1997, Vol. 38, No. 12 1303-1310
© 1997

The Expression of an Abscisic Acid-Responsive Glycine-Rich Protein Coincides with the Level of Seed Dormancy in Fagus sylvatica

Carlos Nicolás1, Dolores Rodríguez1, Finn Poulsen2, Erik N. Eriksen2 and Gregorio Nicolás1

1 Departamento de Biologia Vegetal (Fisiologia Vegetal), Facultad de Biologia, Universidad de Salamanca E-37007 Salamanca, Spain
2 Department of Agricultural Sciences, Section for Horticulture, The Royal Veterinary & Agricultural University Rolighedevsej 23, DK-1958, Frederiksberg c, Denmark

By differential screening of a cDNA library constructed from poly (A+) RNA of ABA-treated seeds of Fagus sylvatica L., we have isolated an ABA-responsive clone that is present in dormant seeds and under conditions that maintain dormancy, but it tends to disappear under conditions breaking seed dormancy. A search of the sequence data bases showed that the clone codes for a Glycine-Rich Protein and has sequence similarity to RNA-binding proteins. The clone, which exibits the characteristics of lea-genes, is up-regulated by ABA and down-regulated by GA3. Paclobutrazol abolishes the effect of GA3, which is restored upon addition of GA3. The possible relationship of this Glycine-Rich Protein to seed dormancy in F. sylvatica is discussed.

(Received May 23, 1997; Accepted September 22, 1997)
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