We construct a covariant functor from the category of monadic MV-algebras into the category of Q-distributive lattices, i.e., distributive lattices with quantifier introduced by R. Cignoli. For every monadic MV-algebra, we construct a dual object named QM-space; these objects form a special subcategory of spectral spaces and of Q-spaces developed by R. Cignoli for Q-distributive lattices.