Journal
PLANT CELL
Volume 25, Issue 10, Pages 3770-3784Publisher
AMER SOC PLANT BIOLOGISTS
DOI: 10.1105/tpc.113.117424
Keywords
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Funding
- National Institutes of Health [GM-47850]
- National Basic Research Program of China (973 Program) [2012CB910900]
- National Science Foundation [MCB-0929100]
- Next-Generation BioGreen 21 Program, Rural Development Administration, Republic of Korea [PJ00901003]
- China Scholarship Council
- Zhejiang University
- Direct For Biological Sciences
- Div Of Molecular and Cellular Bioscience [0929100] Funding Source: National Science Foundation
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Seed germination is the first step for seed plants to initiate a new life cycle. Light plays a predominant role in promoting seed germination, where the initial phase is mediated by photoreceptor phytochrome B (phyB). Previous studies showed that PHYTOCHROME-INTERACTING FACTOR1 (PIF1) represses seed germination downstream of phyB. Here, we identify a positive regulator of phyB-dependent seed germination, LONG HYPOCOTYL IN FAR-RED1 (HFR1). HFR1 blocks PIF1 transcriptional activity by forming a heterodimer with PIF1 that prevents PIF1 from binding to DNA. Our whole-genomic analysis shows that HFR1 and PIF1 oppositely mediate the light-regulated transcriptome in imbibed seeds. Through the HFR1-PIF1 module, light regulates expression of numerous genes involved in cell wall loosening, cell division, and hormone pathways to initiate seed germination. The functionally antagonistic HFR1-PIF1 pair constructs a fail-safe mechanism for fine-tuning seed germination during low-level illumination, ensuring a rapid response to favorable environmental changes. This study identifies the HFR1-PIF1 pair as a central module directing the whole genomic transcriptional network to rapidly initiate light-induced seed germination.
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