Brassinosteroid‐BZR1/2‐WAT1 module determines the high level of auxin signalling in vascular cambium during wood formation

The tight regulation of local auxin homeostasis and signalling maxima in xylem precursor cells specifies the organising activity vascular cambium consequently promotes differentiation wood formation. However, molecular mechanisms underlying are largely unknown. Here, we reveal that brassinosteroid (BR)-activated WALLS ARE THIN1 (WAT1) facilitates formation by enhancing Solanum lycopersicum. Growth defects low readouts BR-deficient tomato cultivar, Micro-Tom, were associated with a novel recessive allele, Slwat1-copi, created insertion retrotransposon last exon SlWAT1 locus. Molecular genetic studies generating gain-of-function loss-of-function mutants revealed is critical regulator for fine tuning outputs to facilitate secondary growth. Finally, discovered BR-regulated SlBZR1/2 directly activated downstream responses upregulation subsequent Our data suggest BR-SlBZR1/2–WAT1 network contributes high level