  Using the superfield formalism, the effective Kahlerian superpotential of the
massless \cal{N}=1 O(N) Wess-Zumino model is computed in the limit of large N,
in three spacetime dimensions. The effective Kahlerian superpotential is
evaluated at the subleading order in the 1/N expansion, which involves diagrams
up to two-loop order, for a small coupling constant. We show that the O(N)
symmetry of the model is preserved in this approximation and that no mass is
dynamically generated in the supersymmetric phase. We discuss why spontaneous
O(N) symmetry breaking cannot be induced by radiative corrections in such
model.
