Journal ArticleDOI
Control of seed dormancy in Nicotiana plumbaginifolia: post-imbibition abscisic acid synthesis imposes dormancy maintenance
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Fluridone, a carotenoid biosynthesis inhibitor, is almost as efficient as GA3 in breaking dormancy and reveals an important role for ABA synthesis in dormancy maintenance in imbibed seeds.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 (ie 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 seedsread more
Citations
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Journal ArticleDOI
Seed dormancy and the control of germination
TL;DR: It is argued that adaptation has taken place on a theme rather than via fundamentally different paths and similarities underlying the extensive diversity in the dormancy response to the environment that controls germination are identified.
Journal ArticleDOI
Abscisic Acid Signaling in Seeds and Seedlings
TL;DR: Abscisic acid regulates many agronomically important aspects of plant development, including the synthesis of seed storage proteins and lipids, the promotion of seed desiccation tolerance and dormancy, and the inhibition of the phase transitions from embryonic to germinative growth and from.
Journal ArticleDOI
Abscisic acid biosynthesis and catabolism
Eiji Nambara,Annie Marion-Poll +1 more
TL;DR: Identification of ABA metabolic genes has revealed that multiple metabolic steps are differentially regulated to fine-tune the ABA level at both transcriptional and post-transcriptional levels.
Journal ArticleDOI
A classification system for seed dormancy
Jerry M. Baskin,Carol C. Baskin +1 more
TL;DR: It is suggested that a modified version of the scheme of the Russian seed physiologist Marianna G. Nikolaeva be adopted and includes three hierarchical layers – class, level and type; thus, a class may contain levels and types, and a level may contain only types.
Journal ArticleDOI
Molecular Aspects of Seed Dormancy
TL;DR: The net result is a slightly heterogeneous response, thereby providing more temporal options for successful germination.
References
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Journal ArticleDOI
Seeds: Physiology of Development and Germination.
Book
Seeds: Physiology of Development and Germination
J. D. Bewley,Michael Black +1 more
TL;DR: Seeds: Germination, Structure, and Composition; Development-Regulation and Maturation; Mobilization of Stored Seed Reserves; and some Ecophysiological Aspects.
Journal ArticleDOI
Seed Germination and Dormancy.
TL;DR: This review provides both an overview of the essential processes that are associated with germination and a description of the possible impediments thereto that may result in dormancy.
Journal ArticleDOI
The isolation and characterization of abscisic acid-insensitive mutants of Arabidopsis thaliana
TL;DR: Three mutants of Arabidopsis thaliana (L.) Heynh were characterized by a reduced seed dormancy and by symptoms of withering, indicating disturbed water relations and resembled phenotypically the ABA-deficient mutants the authors described earlier in this species.
Journal ArticleDOI
Induction of dormancy during seed development by endogenous abscisic acid: studies on abscisic acid deficient genotypes of Arabidopsis thaliana (L.) Heynh.
TL;DR: Mutant lines of Arabidopsis thaliana (L.) Heynh, which are characterized by symptoms of withering and the absence of seed dormancy, showed much lower levels of endogenous abscisic acid (ABA) in developing seeds and fruits than the wild type, and it seems that limited access to water is the primary trigger for the developmental arrest in these seeds.