Transcription factor involved in phosphate starvation response (PubMed:33128314). Acts as positive regulator of phosphate homeostasis and phosphate signaling by antagonizing SPX4 (PubMed:33128314). Transcription factor involved jasmonate signaling (PubMed:15541369, PubMed:22456953). Regulates shoot growth inhibition in response to jasmonate (PubMed:15541369). May play a role as transcriptional activator in the regulation of jasmonate-mediated stress-inducible gene expression (PubMed:22456953). Possesses transactivation activity in vivo (PubMed:22456953, PubMed:33128314). Forms homodimers (PubMed:33128314). Interacts with SPX4 (PubMed:33128314). Expressed in spikelets, leaf mesophyll cells, root tip and root epidermis cells. Induced by jasmonate (PubMed:15541369, PubMed:15914931, PubMed:22456953). Induced by wounding and drought stress in leaves (PubMed:15914931, PubMed:22456953). Induced by phosphate starvation in shoots (PubMed:33128314). Overexpression of BHLH6 promotes shoot and root phosphate accumulation, and root hair growth and acid phosphatase activity under phosphate sufficiency. Belongs to the bHLH protein family.