Transcription factor that is specifically required for the development of root hairs (PubMed:17556585). Acts with RSL1 to positively regulate root hair development (PubMed:17556585). Acts downstream of genes that regulate epidermal pattern formation, such as GL2 (PubMed:17556585). Targets directly RSL4, another transcription factor involved in the regulation of root hair elongation (PubMed:20139979). Acts with RSL1 as transcription factor that integrates a jasmonate (JA) signaling pathway that stimulates root hair growth (PubMed:31988260). Homodimer (Probable). Forms heterodimers with RSL1 (PubMed:31988260). Interacts with TIFY10B/JAZ2, TIFY6A/JAZ4, TIFY5A/JAZ8, TIFY7/JAZ9 and TIFY9/JAZ10 (PubMed:31988260). Expressed constitutively in flowers (PubMed:12679534). Expressed in root epidermal hair cells (PubMed:17556585). Induced by jasmonate (JA) treatment. Strong reduction in root hair number and density in seedlings (PubMed:17556585). The double mutant seedlings rhd6-3 and rsl1-1 do not develop root hairs (PubMed:17556585).