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 demonstrated that the C2H2-type zinc finger protein AtZP1 negatively regulated root hair initiation and elongation in Arabidopsis thaliana by suppressing the transcription of bHLH genes. AtZP1 was highly expressed in root hairs and inhibited transcriptional activity, with overexpression leading to a lack of root hairs and loss-of-function mutants resulting in longer and more numerous root hairs. AtZP1 directly targeted the promoters of key root hair genes, including RHD6, RSL2, and RSL4, and its inhibitory activity was reduced by mutation or deletion of the EAR motif. The findings suggested that AtZP1 acted downstream of GL2, functioning in the GL2/ZP1/RSL pathway to suppress root hair development.
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