Analysis of seedlings treated with auxin only or auxin plus brassinazole (a brassinosteroid (BR) biosynthetic inhibitor). Auxin induces expression of DWARF4. The DWARF4 enzyme catalyzes the rate-determining step in BR biosynthesis. Results provide insight into the role of auxin in BR biosynthesis.
Chung Y, Maharjan PM, Lee O, Fujioka S et al. Auxin stimulates DWARF4 expression and brassinosteroid biosynthesis in Arabidopsis. Plant J 2011 May;66(4):564-78. PMID: 21284753