Seed dormancy and germination: the role of abscisic acid and gibberellins and the importance of hormone mutants

1992 ◽  
Vol 11 (3) ◽  
pp. 225-238 ◽  
Author(s):  
H. W. M. Hilhorst ◽  
C. M. Karssen
Keyword(s):  
Abscisic Acid ◽  
Seed Dormancy ◽  
Seed Dormancy And Germination

Abscisic acid and the control of seed dormancy and germination

2010 ◽  
Vol 20 (2) ◽  
pp. 55-67 ◽  
Author(s):  
Eiji Nambara ◽  
Masanori Okamoto ◽  
Kiyoshi Tatematsu ◽  
Ryoichi Yano ◽  
Mitsunori Seo ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
High Temperature ◽  
Seed Dormancy ◽  
Plant Hormone ◽  
The Core ◽  
Aba Metabolism ◽  
External Cues ◽  
Aba Content ◽  
Seed Dormancy And Germination

AbstractAbscisic acid (ABA) is a plant hormone that regulates seed dormancy and germination. Seeds undergo changes in both ABA content and sensitivity during seed development and germination in response to internal and external cues. Recent advances in functional genomics have revealed the integral components involved in ABA metabolism (biosynthesis and catabolism) and perception, the core signalling pathway, as well as the factors that trigger ABA-mediated transcription. These allow for comparative studies to be conducted on seeds under different environmental conditions and from different genetic backgrounds. This review summarizes our understanding of the control of ABA content and the responsiveness of seeds to afterripening, light, high temperature and nitrate, with a focus on which tissues are involved in its metabolism and signalling. Also described are the regulators of ABA metabolism and signalling, which potentially act as the node for hormone crosstalk. Integration of such knowledge into the complex and diverse events occurring during seed germination will be the next challenge, which will allow for a clearer understanding of the role of ABA.

Regulation of seed dormancy by abscisic acid and DELAY OF GERMINATION 1

2015 ◽  
Vol 25 (2) ◽  
pp. 82-98 ◽  
Author(s):  
Bas J.W. Dekkers ◽  
Leónie Bentsink
Keyword(s):  
Abscisic Acid ◽  
Seed Dormancy ◽  
Plant Hormone ◽  
Complex Trait ◽  
Hormone Interactions ◽  
Physiological Dormancy ◽  
Recent Developments ◽  
Radicle Emergence ◽  
Dormancy Induction

AbstractPhysiological dormancy has been described as a physiological inhibiting mechanism that prevents radicle emergence. It can be caused by the embryo (embryo dormancy) as well as by the structures that cover the embryo. One of its functions is to time plant growth and reproduction to the most optimal season and therefore, in nature, dormancy is an important adaptive trait that is under selective pressure. Dormancy is a complex trait that is affected by many loci, as well as by an intricate web of plant hormone interactions. Moreover, it is strongly affected by a multitude of environmental factors. Its induction, maintenance, cycling and loss come down to the central paradigm, which is the balance between two key hormonal regulators, i.e. the plant hormone abscisic acid (ABA), which is required for dormancy induction, and gibberellins (GA), which are required for germination. In this review we will summarize recent developments in dormancy research (mainly) in the model plant Arabidopsis thaliana, focusing on two key players for dormancy induction, i.e. the plant hormone ABA and the DELAY OF GERMINATION 1 (DOG1) gene. We will address the role of ABA and DOG1 in relation to various aspects of seed dormancy, i.e. induction during seed maturation, loss during dry seed afterripening, the rehydrated state (including dormancy cycling) and the switch to germination.

scholarly journals Seed dormancy and germination changes of snowbed species under climate warming: the role of pre- and post-dispersal temperatures

2016 ◽  
Vol 118 (3) ◽  
pp. 529-539 ◽  
Author(s):  
Giulietta Bernareggi ◽  
Michele Carbognani ◽  
Andrea Mondoni ◽  
Alessandro Petraglia
Keyword(s):  
Seed Dormancy ◽  
Climate Warming ◽  
Seed Dormancy And Germination

scholarly journals On the role of abscisic acid in seed dormancy of red rice

2007 ◽  
Vol 58 (12) ◽  
pp. 3449-3462 ◽  
Author(s):  
A. Gianinetti ◽  
P. Vernieri
Keyword(s):  
Abscisic Acid ◽  
Seed Dormancy ◽  
Red Rice

A critical update on seed dormancy. I. Primary dormancy

1995 ◽  
Vol 5 (2) ◽  
pp. 61-73 ◽  
Author(s):  
Henk W. M. Hilhorst
Keyword(s):  
Cell Wall ◽  
Abscisic Acid ◽  
Seed Dormancy ◽  
Decisive Role ◽  
Morphological Development ◽  
Primary Dormancy ◽  
Whole Seed ◽  
Aba Content ◽  
Cell Wall Properties

AbstractThe emphasis of modern dormancy research is almost entirely on the form of dormancy that is acquired during seed development, primary dormancy. Abscisic acid (ABA) appears to be intimately involved in its regulation. The action of abscisic acid has also been implied in many other developmental processes. The coincidence of developmental events, such as dehydration and completion of maturation, with the acquisition of primary dormancy suggests that dormancy is influenced by these processes. Germinability, both during development and after maturation, is sometimes directly correlated with ABA content. The lack of such a correlation may be explained by assuming a decisive role for the responsiveness to ABA or other overriding factors. ABA has been detected in all seed components. The different seed tissues may all contribute, to various extents, to the degree of whole seed dormancy. It is concluded that ABA action in dormancy regulation is not restricted to the embryo but is also located in endospermic tissue. In addition, a role of ABA in the morphological development of germination modifying seed tissues is proposed. The mechanism for ABA action appears to be associated with cell wall properties.

scholarly journals Arabidopsis thaliana SEED DORMANCY 4-LIKE regulates dormancy and germination by mediating the gibberellin pathway

2019 ◽  
Vol 71 (3) ◽  
pp. 919-933 ◽  
Author(s):  
Hong Cao ◽  
Yi Han ◽  
Jingyi Li ◽  
Meng Ding ◽  
Yu Li ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Cell Wall ◽  
Abscisic Acid ◽  
Seed Dormancy ◽  
Molecular Mechanisms ◽  
Loss Of Function ◽  
Cell Wall Remodeling ◽  
Biochemical Function ◽  
Ga Biosynthesis ◽  
Seed Dormancy And Germination

Abstract The molecular mechanisms underlying seed dormancy and germination are not fully understood. Here, we show that Arabidopsis thaliana SEED DORMANCY 4-LIKE (AtSdr4L) is a novel specific regulator of dormancy and germination. AtSdr4L encodes a protein with an unknown biochemical function that is localized in the nucleus and is expressed specifically in seeds. Loss of function of AtSdr4L results in increased seed dormancy. The germination of freshly harvested seeds of the Atsdr4l mutant is insensitive to gibberellin (GA). After-ripened mutant seeds are hypersensitive to the GA biosynthesis-inhibitor paclobutrazol but show unaltered sensitivity to abscisic acid. Several GA biosynthesis genes and GA-regulated cell wall remodeling genes are down-regulated in the mutant in both dormant and after-ripened seeds. These results suggest that the Atsdr4l mutation causes both decreased GA biosynthesis and reduced responses. In addition, a genetic analysis indicated that AtSdr4L is epistatic to DELAY OF GERMINATION1 (DOG1) for dormancy and acts upstream of RGA-LIKE 2 (RGL2) in the GA pathway. We propose that AtSdr4L regulates seed dormancy and germination by mediating both the DOG1 and GA pathways.

scholarly journals The role of light in regulating seed dormancy and germination

2020 ◽  
Vol 62 (9) ◽  
pp. 1310-1326 ◽  
Author(s):  
Liwen Yang ◽  
Shuangrong Liu ◽  
Rongcheng Lin
Keyword(s):  
Seed Dormancy ◽  
Role Of Light ◽  
Seed Dormancy And Germination
Sign in / Sign up

Export Citation Format

Share Document