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Emerging Roles of FHY3 and FAR1 as System Integrators in Plant Development
Yanyan Zheng, Yanzhao Sun1, Yang Liu1
1College of Horticulture, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing 100094, China.
Abstract:
FAR-RED ELONGATED HYPOCOTYL3 (FHY3) and its homolog FAR-RED-IMPAIRED RESPONSE1 (FAR1) are transcription factors derived from transposases essential for phytochrome A-mediated light signaling. In addition to their essential role in light signaling, FHY3 and FAR1 also play diverse regulatory roles in plant growth and development, including clock entrainment, seed dormancy and germination, senescence, chloroplast formation, branching, flowering and meristem development. Notably, accumulating evidence indicates that the emerging role of FHY3 and FAR1 in environmental stress signaling has begun to be revealed. In this review, we summarize these recent findings in the context of FHY3 and FAR1 as integrators of light and other developmental and stressful signals. We also discuss the antagonistic action of FHY3/FAR1 and Phytochrome Interating Factors (PIFs) in various cross-talks between light, hormone and environmental cues.
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