  We propose a unification scenario for supersymmetric intersecting brane
models. The quarks and leptons are embedded into adjoint representations of
SO(32), which are obtained and break by type I string compactified on
orbifolds. Its single unified gauge coupling can give rise to different gauge
couplings below the unification scale, due to effects of magnetic fluxes. The
crucial mechanism is brane recombination preserving supersymmetry.
