The role of light in regulating seed dormancy and germination

Yang, Liwen; Liu, Shuangrong; Lin, Rongcheng

doi:10.1111/jipb.13001

Cited by 94 publications

(79 citation statements)

References 149 publications

(161 reference statements)

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“…The habit or type of seed dormancy determines the ecological niche of its germination and propagation, which is substantially related to factors of climate, humidity, soil, light, nutrients and biological and abiotic stresses [15,16]. Stratification and burial depth are also considered to be the key factors for seed germination in many plants.…”

Section: Introductionmentioning

confidence: 99%

Practical Methods for Breaking Seed Dormancy in a Wild Ornamental Tulip Species Tulipa thianschanica Regel

Wei

Zhao

et al. 2020

Agronomy

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The innate physiological dormancy of Tulipa thianschanica seeds ensures its survival and regeneration in the natural environment. However, the low percentage of germination restricts the establishment of its population and commercial breeding. To develop effective ways to break dormancy and improve germination, some important factors of seed germination of T. thianschanica were tested, including temperature, gibberellin (GA3) and/or kinetin (KT), cold stratification and sowing depth. The percentage of germination was as high as 80.7% at a constant temperature of 4 °C, followed by 55.6% at a fluctuating temperature of 4/16 °C, and almost no seeds germinated at 16 °C, 20 °C and 16/20 °C. Treatment with exogenous GA3 significantly improved the germination of seeds, but KT had a slight effect on the germination of T. thianschanica seeds. The combined treatment of GA3 and KT was more effective at enhancing seed germination than any individual treatment, and the optimal hormone concentration for the germination of T. thianschanica seeds was 100 mg/L GA3 + 10 mg/L KT. In addition, it took at least 20 days of cold stratification to break the seed dormancy of T. thianschanica. The emergence of T. thianschanica seedlings was the highest with 82.4% at a sowing depth of 1.5 cm, and it decreased significantly at a depth of >3.0 cm. This study provides information on methods to break dormancy and promote the germination of T. thianschanica seeds.

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Section: Introductionmentioning

confidence: 99%

Practical Methods for Breaking Seed Dormancy in a Wild Ornamental Tulip Species Tulipa thianschanica Regel

Wei

Zhao

et al. 2020

Agronomy

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“…Pre-harvest sprouting often causes severe losses in grain yield, quality, and germinability in cereal crops, including rice, wheat, barley, and maize [3,27,28]. Diverse endogenous and environmental factors are involved in the regulation of PHS, including humidity, temperature, light, and phytohormones [1,29]. Among these, ABA and GA are the major endogenous determinants that play antagonistic roles in regulating PHS.…”

Section: Discussionmentioning

confidence: 99%

Genome-Wide Identification and Expression Analysis of OsbZIP09 Target Genes in Rice Reveal Its Mechanism of Controlling Seed Germination

Zhu¹,

Wang²,

Lu³

et al. 2021

IJMS

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Seed dormancy and germination are key events in plant development and are critical for crop production, and defects in seed germination or the inappropriate release of seed dormancy cause substantial losses in crop yields. Rice is the staple food for more than half of the world’s population, and preharvest sprouting (PHS) is one of the most severe problems in rice production, due to a low level of seed dormancy, especially under warm and damp conditions. Therefore, PHS leads to yield loss and a decrease in rice quality and vitality. We reveal that mutation of OsbZIP09 inhibited rice PHS. Analysis of the expression of OsbZIP09 and its encoded protein sequence and structure indicated that OsbZIP09 is a typical bZIP transcription factor that contains conserved bZIP domains, and its expression is induced by ABA. Moreover, RNA sequencing (RNA-seq) and DNA affinity purification sequencing (DAP-seq) analyses were performed and 52 key direct targets of OsbZIP09 were identified, including OsLOX2 and Late Embryogenesis Abundant (LEA) family genes, which are involved in controlling seed germination. Most of these key targets showed consistent changes in expression in response to abscisic acid (ABA) treatment and OsbZIP09 mutation. The data characterize a number of key target genes that are directly regulated by OsbZIP09 and contribute to revealing the molecular mechanism that underlies how OsbZIP09 controls rice seed germination.

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“…Light and temperature responses rely on the antagonistic regulation of the ABA and GA metabolism and signaling pathways, including the opposite regulation of NCED and CYP707A genes. In dicot seeds, white light activates germination by the perception R/FR wavelengths by the phytochrome family of photoreceptors [ 120 ]. In Arabidopsis seeds, an R light pulse has been shown to reduce ABA levels and decrease ZEP , NCED6 and AtNCED9 gene expression, whereas expression of CYP707A2 was increased [ 121 ].…”

Section: Aba Metabolism During Dormancy Release and Germinationmentioning

confidence: 99%

“…A number of transcriptional regulators have been shown to be involved in germination responses to light, including ABA and GA signaling factors [ 120 , 131 ]. In Arabidopsis, phytochrome B (PHYB) is the main photoreceptor in germination activation by R light and reversion by FR light, whereas PHYA promotes germination responses in continuous FR light and at very low fluence rates.…”

Section: Aba Metabolism During Dormancy Release and Germinationmentioning

confidence: 99%

ABA Metabolism and Homeostasis in Seed Dormancy and Germination

Sano

Marion‐Poll

2021

IJMS

116

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Abscisic acid (ABA) is a key hormone that promotes dormancy during seed development on the mother plant and after seed dispersal participates in the control of dormancy release and germination in response to environmental signals. The modulation of ABA endogenous levels is largely achieved by fine-tuning, in the different seed tissues, hormone synthesis by cleavage of carotenoid precursors and inactivation by 8′-hydroxylation. In this review, we provide an overview of the current knowledge on ABA metabolism in developing and germinating seeds; notably, how environmental signals such as light, temperature and nitrate control seed dormancy through the adjustment of hormone levels. A number of regulatory factors have been recently identified which functional relationships with major transcription factors, such as ABA INSENSITIVE3 (ABI3), ABI4 and ABI5, have an essential role in the control of seed ABA levels. The increasing importance of epigenetic mechanisms in the regulation of ABA metabolism gene expression is also described. In the last section, we give an overview of natural variations of ABA metabolism genes and their effects on seed germination, which could be useful both in future studies to better understand the regulation of ABA metabolism and to identify candidates as breeding materials for improving germination properties.

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The role of light in regulating seed dormancy and germination

Cited by 94 publications

References 149 publications

Practical Methods for Breaking Seed Dormancy in a Wild Ornamental Tulip Species Tulipa thianschanica Regel

Practical Methods for Breaking Seed Dormancy in a Wild Ornamental Tulip Species Tulipa thianschanica Regel

Genome-Wide Identification and Expression Analysis of OsbZIP09 Target Genes in Rice Reveal Its Mechanism of Controlling Seed Germination

ABA Metabolism and Homeostasis in Seed Dormancy and Germination

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