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RERJ1/OSBHLH6 (basic helix-loop-helix transcription activator 6) (PubMed:22456953, PubMed:33128314) is involved in control of disease resistance, regulation of salicylic acid (SA) and jasmonic acid (JA) signaling (PubMed:15541369, PubMed:22456953). Regulates shoot growth inhibition in response to jasmonate (PubMed:15541369) and is likely to play a role in the regulation of jasmonate-mediated stress-inducible gene expression (PubMed:22456953). It is upregulated in response to submergence during seed germination and coleoptile growth. Acts as positive regulator of phosphate homeostasis and phosphate signaling by antagonizing SPX4 (PubMed:33128314). it Forms homodimers (PubMed:33128314) and interacts with SPX4 (PubMed:33128314). Expressed in spikelets, leaf mesophyll cells, root tip and root epidermis cells. {ECO:0000269|PubMed:33128314}. Induced by jasmonate (PubMed:15541369, PubMed:15914931, PubMed:22456953), wounding, and drought stress in leaves (PubMed:15914931, PubMed:22456953) and 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. {ECO:0000269|PubMed:33128314}.
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