Two Faces of One Seed： Hormonal Regulation of Dormancy and Germination

Seed plants have evolved to maintain the dormancy of freshly matured seeds until the appropriate time for germination. Seed dormancy and germination are distinct physiological processes, and the transition from dormancy to germination is not only a critical developmental step in the life cycle of pl...

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Published inMolecular plant Vol. 9; no. 1; pp. 34 - 45
Main Authors Shu, Kai, Liu, Xiao-dong, Xie, Qi, He, Zu-hua
Format Journal Article
LanguageEnglish
Published England Elsevier Inc 04.01.2016
Subjects
ABA
abscisic acid
auxin
auxins
crosstalk
germination
Germination - physiology
gibberellins
hormonal regulation
hormones
Plant Dormancy
Plant Growth Regulators - physiology
Plant Physiological Phenomena
Plants
seed dormancy
seeds
Seeds - growth & development
Signal Transduction
Spermatophytina
transcription (genetics)
transcription factors
germination
ABA
seed dormancy
GA
auxin
crosstalk
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Summary:Seed plants have evolved to maintain the dormancy of freshly matured seeds until the appropriate time for germination. Seed dormancy and germination are distinct physiological processes, and the transition from dormancy to germination is not only a critical developmental step in the life cycle of plants but is also impor- tant for agricultural production. These processes are precisely regulated by diverse endogenous hormones and environmental cues. Although ABA （abscisic acid） and GAs （gibberellins） are known to be the primary phytohormones that antagonistically regulate seed dormancy, recent findings demonstrate that another phytohormone, auxin, is also critical for inducing and maintaining seed dormancy, and therefore might act as a key protector of seed dormancy. In this review, we summarize our current understanding of the sophisticated molecular networks involving the critical roles of phytohormones in regulating seed dormancy and germination, in which AP2-domain-containing transcription factors play key roles. We also discuss the interactions （crosstalk） of diverse hormonal signals in seed dormancy and germination, focusing on the ABA/GA balance that constitutes the central node.
Bibliography:31-2013/Q
seed dormancy, germination, ABA, GA, auxin, crosstalk
Seed plants have evolved to maintain the dormancy of freshly matured seeds until the appropriate time for germination. Seed dormancy and germination are distinct physiological processes, and the transition from dormancy to germination is not only a critical developmental step in the life cycle of plants but is also impor- tant for agricultural production. These processes are precisely regulated by diverse endogenous hormones and environmental cues. Although ABA （abscisic acid） and GAs （gibberellins） are known to be the primary phytohormones that antagonistically regulate seed dormancy, recent findings demonstrate that another phytohormone, auxin, is also critical for inducing and maintaining seed dormancy, and therefore might act as a key protector of seed dormancy. In this review, we summarize our current understanding of the sophisticated molecular networks involving the critical roles of phytohormones in regulating seed dormancy and germination, in which AP2-domain-containing transcription factors play key roles. We also discuss the interactions （crosstalk） of diverse hormonal signals in seed dormancy and germination, focusing on the ABA/GA balance that constitutes the central node.
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SourceType-Scholarly Journals-1
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ISSN:1674-2052
1752-9867
1752-9867
DOI:10.1016/j.molp.2015.08.010