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Arabidopsis JAZ Proteins Interact with and Suppress RHD6 Transcription Factor to Regulate Jasmonate-Stimulated Root Hair Development

Xiao Han, Minghui Zhang, Milian Yang, Yanru Hu
Xiao Han
aCAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
bCenter of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Mengla, Yunnan 666303, China
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  • ORCID record for Xiao Han
Minghui Zhang
aCAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
cUniversity of Chinese Academy of Sciences, Beijing 100049, China
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Milian Yang
aCAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
cUniversity of Chinese Academy of Sciences, Beijing 100049, China
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Yanru Hu
aCAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan 650223, China
bCenter of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Mengla, Yunnan 666303, China
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  • For correspondence: huyanru@xtbg.ac.cn

Published April 2020. DOI: https://doi.org/10.1105/tpc.19.00617

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Abstract

Root hairs arise from trichoblasts and are crucial for plant anchorage, nutrient acquisition, and environmental interactions. The phytohormone jasmonate is known to regulate root hair development in Arabidopsis (Arabidopsis thaliana), but little is known about the molecular mechanism underlying jasmonate modulation in this process. Here, we show that the application of exogenous jasmonate significantly stimulated root hair elongation, but, on the contrary, blocking the perception or signaling of jasmonate resulted in defective root hairs. Jasmonate consistently elevated the expression levels of several crucial genes positively involved in root hair growth. Mechanistic investigation revealed that JASMONATE ZIM-DOMAIN (JAZ) proteins, critical repressors of jasmonate signaling, physically interacted with ROOT HAIR DEFECTIVE 6 (RHD6) and RHD6 LIKE1 (RSL1), two transcription factors that are essential for root hair development. JAZ proteins inhibited the transcriptional function of RHD6 and interfered with the interaction of RHD6 with RSL1. Genetic analysis indicated that jasmonate promoted root hair growth in a RHD6/RSL1-dependent manner. Moreover, overexpression of RHD6 largely rescued the root hair defects of JAZ-accumulating plants. Collectively, our study reveals a key signaling module in which JAZ repressors of the jasmonate pathway directly modulate RHD6 and RSL1 transcription factors to integrate jasmonate signaling and the root hair developmental process.

  • Received August 12, 2019.
  • Revised November 26, 2019.
  • Accepted January 23, 2020.
  • Published January 27, 2020.
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Arabidopsis JAZ Proteins Interact with and Suppress RHD6 Transcription Factor to Regulate Jasmonate-Stimulated Root Hair Development
Xiao Han, Minghui Zhang, Milian Yang, Yanru Hu
The Plant Cell Apr 2020, 32 (4) 1049-1062; DOI: 10.1105/tpc.19.00617

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Arabidopsis JAZ Proteins Interact with and Suppress RHD6 Transcription Factor to Regulate Jasmonate-Stimulated Root Hair Development
Xiao Han, Minghui Zhang, Milian Yang, Yanru Hu
The Plant Cell Apr 2020, 32 (4) 1049-1062; DOI: 10.1105/tpc.19.00617
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  • IN BRIEF: Hormonal solution for (root) hair extension

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The Plant Cell: 32 (4)
The Plant Cell
Vol. 32, Issue 4
Apr 2020
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