Transcription factor which acts as positive regulator of drought stress tolerance. Can transactivate CIPK3, NCED3 and ERECTA. Transactivates several cell-wall-loosening protein genes by directly binding to HD motifs in their promoters. These target genes play important roles in coordinating cell-wall extensibility with root development and growth. Transactivates CYP74A/AOS, AOC3, OPR3 and 4CLL5/OPCL1 genes by directly binding to HD motifs in their promoters. These target genes are involved in jasmonate (JA) biosynthesis, and JA signaling affects root architecture by activating auxin signaling, which promotes lateral root formation. Acts as negative regulator of trichome branching. Required for the establishment of giant cell identity on the abaxial side of sepals. May regulate cell differentiation and proliferation during root and shoot meristem development.
Background References
1. Guo XY. et. al. AtEDT1/HDG11 regulates stomatal density and water-use efficiency via ERECTA and E2Fa. New Phytol. 2019 Aug;223(3):1478-1488.
Sequence Similarity
Belongs to the HD-ZIP homeobox family. Class IV subfamily.
Tissue Specificity
Expressed in apical meristems and young epidermal tissue including trichomes and stipules. Expressed in lateral root tips, the L1 layer of apical inflorescence meristems and early flower primordia, carpel and petal epidermis, stigma papillae, ovule primordia, nucellus and embryo.
Immunohistochemical analysis of paraffin-embedded Arabidopsis thaliana tissue using anti-HDG11 antibody. The section was pre-treated using heat mediated antigen retrieval with sodium citrate buffer (pH 6.0) (high pressure) for 2 minutes. The tissues were blocked in 5% BSA for 30 minutes at room temperature, washed with ddH2O and PBS, and then probed with the primary antibody (ER1901-56, 1/50) for 30 minutes at room temperature. The detection was performed using an HRP conjugated compact polymer system. DAB was used as the chromogen. Tissues were counterstained with hematoxylin and mounted with DPX.
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