The release of dormancy, a wake-up call for seeds to germinate

Née, Guillaume; Xiang, Yong Bing; Soppe, Wim J. J.

doi:10.1016/j.pbi.2016.09.002

Cited by 195 publications

(165 citation statements)

References 71 publications

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“…4a that were obtained from plants cultivated at lower temperature (16/14 °C), conditions that enhance dormancy 4 . Freshly harvested seeds were immediately used for experiments or stored under constant conditions (21 °C, 50% humidity, in the dark) for after-ripening treatment.…”

Section: Methodsmentioning

confidence: 99%

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DELAY OF GERMINATION1 requires PP2C phosphatases of the ABA signalling pathway to control seed dormancy

et al. 2017

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The time of seed germination is a major decision point in the life of plants determining future growth and development. This timing is controlled by seed dormancy, which prevents germination under favourable conditions. The plant hormone abscisic acid (ABA) and the protein DELAY OF GERMINATION 1 (DOG1) are essential regulators of dormancy. The function of ABA in dormancy is rather well understood, but the role of DOG1 is still unknown. Here, we describe four phosphatases that interact with DOG1 in seeds. Two of them belong to clade A of type 2C protein phosphatases: ABA-HYPERSENSITIVE GERMINATION 1 (AHG1) and AHG3. These phosphatases have redundant but essential roles in the release of seed dormancy epistatic to DOG1. We propose that the ABA and DOG1 dormancy pathways converge at clade A of type 2C protein phosphatases.

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Section: Methodsmentioning

confidence: 99%

“…Regulators of seed maturation and environmental conditions during seed development affect the strength of seed dormancy. Dormancy is released by imbibition at low temperatures (stratification) or extended dry storage of seeds (after ripening) 3, 4 .…”

Section: Introductionmentioning

confidence: 99%

DELAY OF GERMINATION1 requires PP2C phosphatases of the ABA signalling pathway to control seed dormancy

et al. 2017

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“…The relative level of esterified fatty acid hydroxides (LOH), a stable marker of lipid oxidation, is increased in the bdg1 seeds compared to WT, suggesting accelerated oxidation of seed components in bdg1 . Redox changes inside seeds have been proposed as a mechanism of after‐ripening and dormancy release (Nee et al ). It is possible that accelerated oxidation in the bdg1 seeds positively affects the after‐ripening processes.…”

Section: Seed Germinationmentioning

confidence: 99%

Seed germination and dormancy: The classic story, new puzzles, and evolution

Nonogaki¹

2019

JIPB

140

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This review highlights recent progresses in seed germination and dormancy research. Research on the weakening of the endosperm during germination, which is almost a classic theme in seed biology, was resumed by α‐xylosidase studies. Strong genetic evidence was presented to suggest that the quality control of xyloglucan biosynthesis in the endosperm (and the embryo) plays a critical role in germination. Further analyses on the endosperm and the adjacent layers have suggested that the cutin coat in the endosperm‐testa interphase negatively affects germination while the endosperm‐embryo interphase produces a sheath that facilitates germination. These progresses significantly advanced our understanding of seed germination mechanisms. A breakthrough in dormancy research, on the other hand, revealed the unique abscisic acid signaling pathway that is regulated by DELAY OF GERMINATION1 (DOG1). The detailed analysis of DOG1 expression uncovered the intriguing story of reciprocal regulation of the sense‐antisense pair, which generated new questions. Recent studies also suggested that the DOG1 function is not limited to dormancy but extended through general seed maturation, which provokes questions about the evolution of DOG1 family proteins. Seed biology is becoming more exciting with the classic stories being revitalized and new puzzles emerging from the frontier.

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“…However, both DOG1 and asDOG1 expression is reduced during seed imbibition, and therefore the asDOG1 function may be restricted to seed maturation (Fedak et al, 2016). Modification of DOG1 protein function, rather than its transcriptional control, may be critical for germination induction through after-ripening (Nakabayashi et al, 2012; Nee et al, 2016). Expression levels of asDOG1 during the maturation stage might determine the depth of seed dormancy in mature seeds, although more analyses are necessary to conclude the precise role of this interesting mechanism of asDOG1 in seed dormancy biology.…”

Section: Making a Seed Dormancy Gene “Dormant”mentioning

confidence: 99%

Seed Biology Updates – Highlights and New Discoveries in Seed Dormancy and Germination Research

Nonogaki

2017

Front. Plant Sci.

100

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An understanding of the biology of seeds has been greatly advanced in recent years. The progresses, particularly in the field of seed dormancy and germination research, have been made at a remarkable speed. Some of the possible epigenetic mechanisms, including an involvement of non-coding RNA, which were predicted for DELAY OF GERMINATION1 just a few years ago, have now been demonstrated with strong molecular and genetic evidence. Imprinting, or parent-of-origin-specific gene silencing/expression, which was characterized particularly for developing seeds, was also found in imbibed seeds and suggested for dormancy mechanisms. Hormone biology in seeds, which is the most advanced and almost a traditional area of seed research, also presents a new dimension. Upstream regulators of hormone metabolism and hormone transporters, such as abscisic acid and gibberellin influx/efflux carriers, have been identified. Characterization of the novel posttranslational modification pathways, including the N-end rule and S-nitrosylation pathways, which play a critical role in turnover of the major hormone signal transduction proteins, also expanded our knowledge about the complexity of hormone signaling in seeds. These progresses made at the molecular level are significant steps toward a better understanding of how seeds translate soil and other environmental signals into their internal hormone biology and make an important decision to stay dormant or commence with germination.

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The release of dormancy, a wake-up call for seeds to germinate

Cited by 195 publications

References 71 publications

DELAY OF GERMINATION1 requires PP2C phosphatases of the ABA signalling pathway to control seed dormancy

DELAY OF GERMINATION1 requires PP2C phosphatases of the ABA signalling pathway to control seed dormancy

Seed germination and dormancy: The classic story, new puzzles, and evolution

Seed Biology Updates – Highlights and New Discoveries in Seed Dormancy and Germination Research

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