Document Detail


Control of seed dormancy in Nicotiana plumbaginifolia: post-imbibition abscisic acid synthesis imposes dormancy maintenance.
MedLine Citation:
PMID:  10664134     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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 (GA(3)) 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 GA(3) 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 GA(3) inhibited the accumulation of ABA in imbibed dormant seeds. This reveals an important role for ABA synthesis in dormancy maintenance in imbibed seeds.
Authors:
P Grappin; D Bouinot; B Sotta; E Miginiac; M Jullien
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Planta     Volume:  210     ISSN:  0032-0935     ISO Abbreviation:  Planta     Publication Date:  2000 Jan 
Date Detail:
Created Date:  2000-06-01     Completed Date:  2000-06-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  1250576     Medline TA:  Planta     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  279-85     Citation Subset:  IM    
Affiliation:
UMR INRA-INA PG Biologie des Semences, INRA Versailles, route de St Cyr, 78026 Versailles Cedex, France.
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MeSH Terms
Descriptor/Qualifier:
Abscisic Acid / biosynthesis,  genetics,  pharmacology
Dose-Response Relationship, Drug
Germination / physiology
Gibberellins / pharmacology
Kinetics
Mutation
Plant Growth Regulators / pharmacology
Plants, Toxic*
Pyridones / pharmacology
Seeds / drug effects,  growth & development*,  metabolism
Tobacco / drug effects,  genetics,  physiology*
Water / metabolism,  pharmacology
Chemical
Reg. No./Substance:
0/Gibberellins; 0/Plant Growth Regulators; 0/Pyridones; 21293-29-8/Abscisic Acid; 59756-60-4/fluridone; 77-06-5/gibberellic acid; 7732-18-5/Water

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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