Arabidopsis Zinc Finger Protein1 Acts Downstream of GL2 to Repress Root Hair Initiation and Elongation by Directly Suppressing bHLH Genes

    November 2019 in “ The Plant Cell ”
    Guoliang Han, Xiaocen Wei, Xinxiu Dong, Chengfeng Wang, Na Sui, Jianrong Guo, Fang Yuan, Zhizhong Gong, Xuezhi Li, Yi Zhang, Zhe Meng, Zhuo Chen, Dazhong Zhao, Baoshan Wang
    TLDR AtZP1 protein stops root hair growth in plants by blocking certain genes.
    The study investigated the role of Arabidopsis ZINC FINGER PROTEIN1 (AtZP1) in root hair development, revealing that AtZP1 acted downstream of GL2 to repress root hair initiation and elongation by directly suppressing bHLH genes such as RHD6, RSL4, and RSL2. Overexpression of AtZP1 resulted in the absence of root hairs, while loss-of-function mutants exhibited longer and more numerous root hairs. AtZP1 was found to be a transcriptional repressor, with its EAR motif being crucial for this activity. The research highlighted AtZP1's significant role in regulating root hair development by repressing specific transcription factors, providing insights into the genetic control of root hair formation in Arabidopsis.
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