Control of seed dormancy in Nicotiana plumbaginifolia: post-imbibition abscisic acid synthesis imposes dormancy maintenance |
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| Authors: | Philippe Grappin Denise Bouinot Bruno Sotta Emile Miginiac Marc Jullien |
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| Affiliation: | (1) UMR INRA-INA PG Biologie des Semences, INRA Versailles, route de St Cyr, 78026 Versailles Cedex, France, FR;(2) UMR INRA-INA PG Biologie des Semences, Chaire de Physiologie Végétale, INA P-G, 16 rue Claude Bernard, 75231 Paris Cedex 05, France, FR;(3) Laboratoire de Physiologie du Développement des Plantes, UMR de Physiologie Cellulaire et Moléculaire des Plantes, Université Pierre et Marie Curie (PVI), tour 53 (E5, casier 156), 4 Place Jussieu, 75252 Paris Cedex 05, France, FR |
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| Abstract: | The physiological characteristics of seed dormancy in Nicotiana plumbaginifolia Viv. are described. The level of seed dormancy is defined by the delay in seed germination (i.e the time required prior to germination) under favourable environmental conditions. A wild-type line shows a clear primary dormancy, which is suppressed by afterripening, whereas an abscisic acid (ABA)-deficient mutant shows a non-dormant phenotype. We have investigated the role of ABA and gibberellic acid (GA3) in the control of dormancy maintenance or breakage during imbibition in suitable conditions. It was found that fluridone, a carotenoid biosynthesis inhibitor, is almost as efficient as GA3 in breaking dormancy. Dry dormant seeds contained more ABA than dry afterripened seeds and, during early imbibition, there was an accumulation of ABA in dormant seeds, but not in afterripened seeds. In addition, fluridone and exogenous GA3 inhibited the accumulation of ABA in imbibed dormant seeds. This reveals an important role for ABA synthesis in dormancy maintenance in imbibed seeds. Received: 31 December 1998 / Accepted: 9 July 1999 |
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| Keywords: | : Abscisic acid – Fluridone – Germination – Nicotiana (seed dormancy) – Seed dormancy |
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