A CLE14 Signaling Cascade Promotes Arabidopsis Root Hair Elongation

    May 2025 in “ Plant Cell & Environment ”
    Yong Zhou, Youxin Yang, Ziwen Qiu, Ziyao Hu, Langrang Zhang, Yufang Wen, Chao Ji, Qiyong Guo, Yuelong Zhou, Jianping Liu, Guodong Wang, Huibin Han
    TLDR CLE14 peptide promotes root hair growth in Arabidopsis.
    This study reveals that the CLE14 peptide is a crucial regulator of root hair elongation in Arabidopsis. CRISPR/Cas9-generated cle14-cr mutants show reduced root hair length, while CLE14 overexpression and synthetic CLE14 peptide enhance elongation. The process requires CLV2 and CRN proteins, as their absence compromises CLE14-induced growth. Ethylene acts downstream of the CLE14-CLV2/CRN module, with CLE14 upregulating RHD6 and RSL4 expression via ethylene signaling transcription factors EIN3 and EIL1. RSL4 then promotes hydrogen peroxide and nitric oxide accumulation, driving root hair elongation. This research clarifies the signaling pathway of CLE14 in root hair growth.
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