N = 2 Superstring Theory Generates Supersymmetric Chern-simons Theories

We show that the action of self-dual supersymmetric Yang-Mills theory in four-dimensions, which describes the consistent massless background fields for N = 2 superstring, generates the actions for N = 1 and N = 2 supersymmetric non-Abelian Chern-Simons theories in three-dimensions after appropriate dimensional reductions. Since the latters play important roles for supersymmetric integrable models, this result indicates the fundamental significance of the N = 2 superstring theory controlling (possibly all) supersymmetric integrable models in lower-dimensions.