This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Chen, S. S. C. Articles by Park, W.-M. Search for Related Content PubMed PubMed Citation Articles by Chen, S. S. C. Articles by Park, W.-M. Agricola Articles by Chen, S. S. C. Articles by Park, W.-M.

Articles

Early Actions of Gibberellic Acid on the Embryo and on the Endosperm of Avena fatua Seeds ¹

^a Department of Biological Sciences, University of Illinois at Chicago Circle, Chicago, Illinois 60680

Gibberellic acid at 0.1 µM stimulates amylase synthesis in dormant Avena fatua seeds without inducing germination; at 0.5 mM it enhances biosynthesis of proteins and RNA in both the embryo and the endosperm and utilization of the endosperm sugars by the embryo. These events occur in early hours (0-14th hour) and prior to germination, which begins 24 hours after gibberellic acid application. These observations are in agreemeent with the concept that in cereal grains gibberellic acid has two morphological sites of actions: the embryo and the endosperm, and that germination (radicle protrusion) is not caused by gibberellic acid-induced amylase synthesis in the endosperm.