InterPro domain: IPR030019

SHORT-ROOT (SHR) is a transcription factor required for asymmetric cell division involved in radial pattern formation in roots (cortex/endodermis differentiation) [ 1 ] and root vascular patterning [ 2 ]. It is a mobile transcription factor that acts in a concentration-dependent manner [ 3 ]. SHR is also involved in the developmental pathway for bundle sheath (BS) cell-fate specification. BS cells form a single cell layer surrounding the vascular tissue in leaves. SHR is expressed in the central vascular tissue, but moves into the BS cells where directly regulates SCR (Scarecrow) and SCL23 (Scarecrow-like 23) expression [ 4 ].

1. The SHORT-ROOT gene controls radial patterning of the Arabidopsis root through radial signaling. Cell 101, 555-67
2. SHORT-ROOT regulates vascular patterning, but not apical meristematic activity in the Arabidopsis root through cytokinin homeostasis. Plant Signal Behav 7, 314-7
3. The SHORT-ROOT protein acts as a mobile, dose-dependent signal in patterning the ground tissue. Proc. Natl. Acad. Sci. U.S.A. 109, 13010-5
4. SCARECROW, SCR-LIKE 23 and SHORT-ROOT control bundle sheath cell fate and function in Arabidopsis thaliana. Plant J. 78, 319-27