J Integr Plant Biol ›› 2022, Vol. 64 ›› Issue (11): 2075-2096.DOI: 10.1111/jipb.13360

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  • 收稿日期:2022-09-05 接受日期:2022-09-07 出版日期:2022-11-01 发布日期:2022-11-17

The transcriptional co-repressor SEED DORMANCY 4-LIKE (AtSDR4L) promotes the embryonic-to-vegetative transition in Arabidopsis thaliana

Ting Wu1†, Milad Alizadeh2†, Bailan Lu2†, Jinkui Cheng1†, Ryan Hoy2, Miaoyu Bu1, Emma Laqua2, Dongxue Tang1, Junna He1, Dongeun Go2, Zhizhong Gong1* and Liang Song2*   

  1. 1 State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Science, China Agricultural University, Beijing 100193, China
    2 Department of Botany, University of British Columbia, Vancouver, British Columbia, V6T 1Z4, Canada

    †These authors contributed equally to this work.
    *Correspondences: Zhizhong Gong (gongzz@cau.edu.cn); Liang Song (liang.song@botany.ubc.ca; Dr. Song is fully responsible for the distribution of all materials associated with this article)
  • Received:2022-09-05 Accepted:2022-09-07 Online:2022-11-01 Published:2022-11-17

Abstract:

Repression of embryonic traits during the seed-to-seedling phase transition requires the inactivation of master transcription factors associated with embryogenesis. How the timing of such inactivation is controlled is unclear. Here, we report on a novel transcriptional co-repressor, Arabidopsis thaliana SDR4L, that forms a feedback inhibition loop with the master transcription factors LEC1 and ABI3 to repress embryonic traits post-imbibition. LEC1 and ABI3 regulate their own expression by inducing AtSDR4L during mid to late embryogenesis. AtSDR4L binds to sites upstream of LEC1 and ABI4, and these transcripts are upregulated in Atsdr4l seedlings. Atsdr4l seedlings phenocopy a LEC1 overexpressor. The embryonic traits of Atsdr4l can be partially rescued by impairing LEC1 or ABI3. The penetrance and expressivity of the Atsdr4l phenotypes depend on both developmental and external cues, demonstrating the importance of AtSDR4L in seedling establishment under suboptimal conditions.

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