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Epidermal hydrodynamics controls water homeostasis of shoot meristems for plant adaptation to terrestrial environments.

Zhu Y, Zhu X, Bi S, Teng D, Tahir M, Liu Y, Wang L, Liu H, Wen T, Zhu L, Li Z, Chen X, Zhang M, Cai W, Liu Z, Zheng M, Zhang Y, Gong JM, Wang JW, He Z, Li L, Wang E, Ji M, Yang W. · 2026 · Developmental cell   research

doi:10.1016/j.devcel.2025.09.007   PMID:41033307

Linked genes (5)  3 core 2 peripheral

Gene ID	Name	Evidence / Role	Function (this paper)
Mp7g09710	MpC4HDZ	experimental subject	The single Marchantia C4HDZ gene (ATML1 ortholog). Dual-luciferase and CRISPR (Mpc4hdz-1) assays show MpC4HDZ binds L1-box motifs and positively activates MpPIP1/MpPIP2 expression; its overexpression promoted erect thallus growth, indicating an ancient HD-ZIP control of aquaporin/water flux.
Mp2g13930	MpPIP1 missing	experimental subject	A PIP-family aquaporin expressed in M. polymorpha and a transcriptional target of MpC4HDZ. CRISPR double mutants Mppip1 Mppip2 grew appressed to the surface, implicating MpPIP1 in epidermal hydraulic water homeostasis.
Mp4g17210	MpPIP2	experimental subject	A PIP-family aquaporin expressed in M. polymorpha and a transcriptional target of MpC4HDZ. CRISPR double mutants Mppip1 Mppip2 grew appressed to the surface, implicating MpPIP2 with MpPIP1 in epidermal water flux.
Mp3g22950	missing	experimental tool	Ubiquitin C promoter used to drive Cas9 expression in the CRISPR constructs.
—	MpU6 missing	experimental tool	U6 promoter used to drive gRNA expression in the CRISPR-Cas9 mutagenesis constructs.