New supersymmetric source of neutrino masses and mixings.

Conventionally, neutrino masses in a supersymmetric theory arise from nonrenormalizable lepton-number (L)-violating operators in the superpotential. The alternative possibility of having such operators in the Kähler potential as the dominant source of neutrino masses has very interesting implications and differences with respect to the standard scenario: first, the scale of L violation can be lowered dramatically; second, the renormalization of these operators has remarkable properties: in many cases it improves drastically the stability of neutrino textures against radiative corrections, while in others it makes it possible to generate radiatively large mixing angles in a natural way.