Seed dormancy and the control of germination
TLDR
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.Abstract:
Seed dormancy is an innate seed property that defines the environmental conditions in which the seed is able to germinate. It is determined by genetics with a substantial environmental influence which is mediated, at least in part, by the plant hormones abscisic acid and gibberellins. Not only is the dormancy status influenced by the seed maturation environment, it is also continuously changing with time following shedding in a manner determined by the ambient environment. As dormancy is present throughout the higher plants in all major climatic regions, adaptation has resulted in divergent responses to the environment. Through this adaptation, germination is timed to avoid unfavourable weather for subsequent plant establishment and reproductive growth. In this review, we present an integrated view of the evolution, molecular genetics, physiology, biochemistry, ecology and modelling of seed dormancy mechanisms and their control of germination. We argue that adaptation has taken place on a theme rather than via fundamentally different paths and identify similarities underlying the extensive diversity in the dormancy response to the environment that controls germination.read more
Citations
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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.
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Molecular networks regulating Arabidopsis seed maturation, after-ripening, dormancy and germination
TL;DR: Current knowledge of the molecular control of this trait in Arabidopsis thaliana is presented, focussing on important components functioning during the developmental phases of seed maturation, after-ripening and imbibition.
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From intracellular signaling networks to cell death: the dual role of reactive oxygen species in seed physiology.
TL;DR: The concept of the "oxidative window for germination" as mentioned in this paper restricts the occurrence of the cellular events associated with germination to a critical range of reactive oxygen species (ROS) level, enclosed by lower and higher limits.
Journal ArticleDOI
Shaping the calcium signature.
Martin R. McAinsh,Jon K. Pittman +1 more
TL;DR: Evidence is reviewed which indicates that Ca2+ channel, Ca2-ATPase andCa2+ exchanger isoforms can indeed modulate specific Ca2+.
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First off the mark: early seed germination
TL;DR: An integrated view on the early phase of seed germination is provided and it is shown that it is characterized by dynamic biomechanical changes together with very early alterations in transcript, protein, and hormone levels that set the stage for the later events.
References
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Biophysical, physiological and biochemical processes regulating seed germination
TL;DR: Molecular and biochemical studies are revealing the complexity of events occurring in endosperm and embryo cells associated with the completion of germination, and unique permeability properties and the presence of enzymes associated with pathogen resistance suggest additional functional roles for the tissues enclosing the embryo.
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Longevité des semences de mauvaises herbes annuelles dans un sol cultivé
TL;DR: In this article, the authors investigated the persistence of weed seeds in a monocultivated soil and found that the annual decline of the seed bank was more or less rapid depending on species.
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A simulation model to predict seed dormancy loss in the field for Bromus tectorum L.
TL;DR: In this article, a thermal after-ripening time model for simulating seed dormancy loss of B. tectorum in the field is presented, which employs the hydrothermal time parameter mean base water potential (ψ b (50)) as an index of dormancy status.
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Quantitative models characterizing seed germination responses to abscisic Acid and osmoticum.
Bing-Rui Ni,Kent J. Bradford +1 more
TL;DR: Mathematical models developed to characterize the physiological bases of the responses of tomato seed germination to water potential and ABA indicate that ABA and psi can act both independently and interactively to influence physiological processes preparatory for radicle growth, such as the accumulation of osmotic solutes in the embryo.
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Genetic differences in seed longevity of various Arabidopsis mutants
Emile J.M. Clerkx,Hetty Blankestijn-de Vries,Gerda J. Ruys,Steven P.C. Groot,Maarten Koornneef +4 more
TL;DR: Using Arabidopsis mutants in defined developmental or biochemical pathways such as those affected in seed coat composition, seed dormancy, hormone function and control of oxidative stress, insight is gained into the genes and mechanisms controlling viability of stored seeds.