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Zhou, Y.* ; Sommer, M.L.* ; Meyer, A.* ; Wang, D.* ; Klaus, A.* ; Stocker, T.* ; Marcon, C.* ; Schoof, H.* ; Haberer, G. ; Schön, C.C.* ; Yu, P.* ; Hochholdinger, F.*

Cold mediates maize root hair developmental plasticity via epidermis-specific transcriptomic responses.

Plant Physiol. 196, 2105-2120 (2024)

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Licenced for HMGU: Publ. Version/Full Text online available 10/2025

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Cold stress during early development limits maize (Zea mays L.) production in temperate zones. Low temperatures restrict root growth and reprogram gene expression. Here, we provide a systematic transcriptomic landscape of maize primary roots, their tissues, and cell types in response to cold stress. The epidermis exhibited a unique transcriptomic cold response, and genes involved in root hair formation were dynamically regulated in this cell type by cold. Consequently, activation of genes involved in root hair tip growth contributed to root hair recovery under moderate cold conditions. The maize root hair defective mutants roothair defective 5 (rth5) and roothair defective 6 (rth6) displayed enhanced cold tolerance with respect to primary root elongation. Furthermore, dehydration response element-binding protein 2.1 (dreb2.1) was the only member of the dreb subfamily of AP2/EREB transcription factor genes upregulated in primary root tissues and cell types but exclusively downregulated in root hairs upon cold stress. Plants overexpressing dreb2.1 significantly suppressed root hair elongation after moderate cold stress. Finally, the expression of rth3 was regulated by dreb2.1 under cold conditions, while rth6 transcription was regulated by dreb2.1 irrespective of the temperature regime. We demonstrated that dreb2.1 negatively regulates root hair plasticity at low temperatures by coordinating the expression of root hair defective genes in maize.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Cell Type Specificity ; Cold Stress ; Laser Capture Microdissection (lcm) ; Primary Root ; Tissue Specificity ; Transcriptome; Tolerance; Initiation

ISSN (print) / ISBN 0032-0889

e-ISSN 1532-2548

Journal Plant Physiology

Quellenangaben Volume: 196, Issue: 3, Pages: 2105-2120

Publisher American Society of Plant Biologists (ASPB)

Publishing Place Journals Dept, 2001 Evans Rd, Cary, Nc 27513 Usa

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Research Unit Plant Genome and Systems Biology (PGSB)

Grants German Federal Ministry of Education and Research (BMBF) program "BMBF-Plant Breeding Research for Bioeconomy" within the project "Accessing the genomic and functional diversity of maize to improve quantitative traits (MAZE)"