NtJAZ4 and NtHD12 co-regulate the stigma epidermal development in Nicotiana tabacum.

NtHD12 physically interacts with NtJAZ4 and co-regulates stigma epidermal development in Nicotiana tabacum, with NtHD12 loss linked to downregulated epidermal development genes.

• Why it matters: HD-Zip IV transcription factors are known to shape plant epidermal development, but how specific members control tobacco stigma epidermis and their molecular circuitry is unclear.
• What they did: The study combined NtHD12 knockout RNA-seq versus CK, gene-expression analyses of JA signaling and stigma-related targets, protein-protein interaction assays, and phenotyping of NtHD12-OE and NtJAZ4-KO lines.
• The result: NtHD12-KO produced significantly downregulated epidermal development-related genes, and NtHD12-OE and NtJAZ4-KO showed highly similar stigma epidermis phenotypes, while NtJAZ4 negatively regulates NtHD12 activity.

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