From the Outside to the Inside: New Insights on the Main Factors That Guide Seed Dormancy and Germination.

Published on Dec 31, 2020in Genes3.759
· DOI :10.3390/GENES12010052
Chiara Longo3
Estimated H-index: 3
Soyanni Holness1
Estimated H-index: 1
+ 4 AuthorsPaola Vittorioso13
Estimated H-index: 13
The transition from a dormant to a germinating seed represents a crucial developmental switch in the life cycle of a plant. Subsequent transition from a germinating seed to an autotrophic organism also requires a robust and multi-layered control. Seed germination and seedling growth are multistep processes, involving both internal and external signals, which lead to a fine-tuning control network. In recent years, numerous studies have contributed to elucidate the molecular mechanisms underlying these processes: from light signaling and light-hormone crosstalk to the effects of abiotic stresses, from epigenetic regulation to translational control. However, there are still many open questions and molecular elements to be identified. This review will focus on the different aspects of the molecular control of seed dormancy and germination, pointing out new molecular elements and how these integrate in the signaling pathways already known.
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#2Puthan Valappil Rahul (Indian Institute of Science Education and Research, Bhopal)H-Index: 3
Last. Sourav Datta (IISc: Indian Institute of Science)H-Index: 12
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In contradiction with what has been reported before, the light signaling factor HY5 negatively regulates ABA-mediated inhibition of post-germination seedling growth by acting downstream to COP1.
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#1Zhijuan Wang (HAU: Huazhong Agricultural University)H-Index: 8
#2Ziyin Ren (HAU: Huazhong Agricultural University)H-Index: 3
Last. Jian-Kang Zhu (Purdue University)H-Index: 167
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Abstract Seed germination and seedling establishment are important for the reproductive success of plants, but seeds and seedlings typically encounter constantly changing environmental conditions. By inhibiting seed germination and postgerminative growth through the PYR1/PYL/RCAR ABA receptors and PP2C co-receptors, the phytohormone abscisic acid (ABA) prevents premature germination and seedling growth under unfavorable conditions. However, little is known about how the ABA-mediated inhibition o...
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The phytochrome B (phyB) photoreceptor plays a major role that inputs light signals to regulate seed dormancy and germination. PHYTOCHROME-INTERACTING FACTOR1 (PIF1) is a key transcription factor repressing phyB-mediated seed germination, while REVEILLE1 (RVE1) transcription factor functions as a curial regulator in controlling both seed dormancy and germination. However, the relationship between the PIF1- and RVE1-modulated signaling pathways remains mostly unknown. Here, we find that PIF1 phys...
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Seed dormancy is an adaptive trait in plants. Breaking seed dormancy determines the timing of germination and is, thereby essential for ensuring plant survival and agricultural production. Seed dormancy and the subsequent germination are controlled by both internal cues (mainly hormones) and environmental signals. In the past few years, the roles of plant hormones in regulating seed dormancy and germination have been uncovered. However, we are only beginning to understand how light signaling pat...
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