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The epidermis coordinates thermoresponsive growth through the phyB-PIF4-auxin pathway

Author

Listed:
  • Sara Kim

    (Korea University)

  • Geonhee Hwang

    (Korea University)

  • Soohwan Kim

    (Korea University)

  • Thom Nguyen Thi

    (Chonnam National University)

  • Hanim Kim

    (KAIST)

  • Jinkil Jeong

    (Salk Institute for Biological Studies)

  • Jaewook Kim

    (Kyushu University)

  • Jungmook Kim

    (Chonnam National University)

  • Giltsu Choi

    (KAIST)

  • Eunkyoo Oh

    (Korea University)

Abstract

In plants, an elevation in ambient temperature induces adaptive morphological changes including elongated hypocotyls, which is predominantly regulated by a bHLH transcription factor, PIF4. Although PIF4 is expressed in all aerial tissues including the epidermis, mesophyll, and vascular bundle, its tissue-specific functions in thermomorphogenesis are not known. Here, we show that epidermis-specific expression of PIF4 induces constitutive long hypocotyls, while vasculature-specific expression of PIF4 has no effect on hypocotyl growth. RNA-Seq and qRT-PCR analyses reveal that auxin-responsive genes and growth-related genes are highly activated by epidermal, but not by vascular, PIF4. Additionally, inactivation of epidermal PIF4 or auxin signaling, and overexpression of epidermal phyB suppresses thermoresponsive growth, indicating that epidermal PIF4-auxin pathways are essential for the temperature responses. Further, we show that high temperatures increase both epidermal PIF4 transcription and the epidermal PIF4 DNA-binding ability. Taken together, our study demonstrates that the epidermis regulates thermoresponsive growth through the phyB-PIF4-auxin pathway.

Suggested Citation

  • Sara Kim & Geonhee Hwang & Soohwan Kim & Thom Nguyen Thi & Hanim Kim & Jinkil Jeong & Jaewook Kim & Jungmook Kim & Giltsu Choi & Eunkyoo Oh, 2020. "The epidermis coordinates thermoresponsive growth through the phyB-PIF4-auxin pathway," Nature Communications, Nature, vol. 11(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-14905-w
    DOI: 10.1038/s41467-020-14905-w
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    Cited by:

    1. Jie Cao & Zhen Qin & Guangxian Cui & Zhaoyan Chen & Xuejiao Cheng & Huiru Peng & Yingyin Yao & Zhaorong Hu & Weilong Guo & Zhongfu Ni & Qixin Sun & Mingming Xin, 2024. "Natural variation of STKc_GSK3 kinase TaSG-D1 contributes to heat stress tolerance in Indian dwarf wheat," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    2. Zixin Zhang & Xin Zhang & Yuting Chen & Wenqian Jiang & Jing Zhang & Jiayu Wang & Yanjun Wu & Shouchuang Wang & Xiao Yang & Mingchun Liu & Yang Zhang, 2023. "Understanding the mechanism of red light-induced melatonin biosynthesis facilitates the engineering of melatonin-enriched tomatoes," Nature Communications, Nature, vol. 14(1), pages 1-12, December.

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