  We point out that the null results of the hadronic electric dipole moment
(EDM) searches constrain orbifold grand unified theories (GUTs), where the GUT
symmetry and supersymmetry (SUSY) are both broken by boundary conditions in
extra dimensions and it leads to rich fermion and sfermion flavor structures. A
marginal chromoelectric dipole moment (CEDM) of the up quark is induced by the
misalignment between the CP violating left- and right-handed up-type squark
mixings, in contrast to the conventional four-dimensional SUSY GUTs. The up
quark CEDM constraint is found to be as strong as those from charged lepton
flavor violation (LFV) searches. The interplay between future EDM and LFV
experiments will probe the structures of the GUTs and the SUSY breaking
mediation mechanism.
