  We discuss the inflationary production of magnetic seeds for the galactic
dynamo through the photon-graviphoton mixing typical of extended models of
local supersymmetry. An analisys of the allowed region in parameter space shows
that such a mechanism is compatible with existing phenomenological bounds on
the vector mass and on the mixing parameter, but requires a large enough mixing
that seems difficult to implement naturally in the context of a minimal
supersymmetric scenario.
