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Transcriptional Regulation of PLETHORA1 in the Root Meristem Through an Importin and Its Two Antagonistic Cargos

Feng Xiong, Bi-Ke Zhang, Hai-Hong Liu, Guo Wei, Ju-Hua Wu, Ya-Nan Wu, Yan Zhang, Sha Li
Feng Xiong
aState Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai’an 271018, China
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Bi-Ke Zhang
aState Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai’an 271018, China
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Hai-Hong Liu
aState Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai’an 271018, China
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Guo Wei
aState Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai’an 271018, China
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Ju-Hua Wu
aState Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai’an 271018, China
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Ya-Nan Wu
aState Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai’an 271018, China
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Yan Zhang
aState Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai’an 271018, China
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Sha Li
aState Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai’an 271018, China
bDepartment of Plant Biology and Ecology, College of Life Sciences, Nankai University, Tianjin 300071, China
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  • For correspondence: shali@sdau.edu.cn

Published December 2020. DOI: https://doi.org/10.1105/tpc.20.00108

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Abstract

Plant roots are sustained through meristem activity at the root tip. Two transcriptional pathways, one mediated by PLETHORAs (PLTs) and the other by SHORTROOT and SCARECROW, play major roles in root meristem development. The role of PLTs during root meristem development requires a concentration gradient, which is not only contributed by posttranslational regulation such as growth dilution and intercellular movement but also likely by a largely unknown fine-tuned transcriptional regulatory mechanism. We report here that Arabidopsis (Arabidopsis thaliana) JANUS positively regulates PLT1 expression in the root meristem by recruiting RNA polymerase II (Pol II) to PLT1 and by interacting with PLT1. JANUS-dependent recruitment of Pol II is inhibited through the competitive binding of JANUS by GRF-INTERACTING FACTOR1 (GIF1)/ANGUSTIFOLIA3, a transcriptional cofactor that negatively regulates PLT1 expression. Finally, GIF1 and JANUS, the antagonistic regulators of PLT1, both depend on Arabidopsis IMPORTIN β4 for their nuclear accumulation. The combination of an importin and its two antagonistic cargos in PLT1 transcription may have logistic benefits in fine-tuning the transcription of PLT1 in root meristem.

  • Received February 11, 2020.
  • Revised August 31, 2020.
  • Accepted September 21, 2020.
  • Published September 28, 2020.
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Transcriptional Regulation of PLETHORA1 in the Root Meristem Through an Importin and Its Two Antagonistic Cargos
Feng Xiong, Bi-Ke Zhang, Hai-Hong Liu, Guo Wei, Ju-Hua Wu, Ya-Nan Wu, Yan Zhang, Sha Li
The Plant Cell Dec 2020, 32 (12) 3812-3824; DOI: 10.1105/tpc.20.00108

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Transcriptional Regulation of PLETHORA1 in the Root Meristem Through an Importin and Its Two Antagonistic Cargos
Feng Xiong, Bi-Ke Zhang, Hai-Hong Liu, Guo Wei, Ju-Hua Wu, Ya-Nan Wu, Yan Zhang, Sha Li
The Plant Cell Dec 2020, 32 (12) 3812-3824; DOI: 10.1105/tpc.20.00108
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The Plant Cell: 32 (12)
The Plant Cell
Vol. 32, Issue 12
Dec 2020
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