  We employ the light-cone formalism to construct in the (super) Yang-Mills
theories in the multi-color limit the one-loop dilatation operator acting on
single trace products of chiral superfields separated by light-like distances.
In the N=4 Yang-Mills theory it exhausts all Wilson operators of the maximal
Lorentz spin while in nonsupersymmetric Yang-Mills theory it is restricted to
the sector of maximal helicity gluonic operators. We show that the dilatation
operator in all N-extended super Yang-Mills theories is given by the same
integral operator which acts on the (N+1)-dimensional superspace and is
invariant under the SL(2|N) superconformal transformations. We construct the
R-matrix on this space and identify the dilatation operator as the Hamiltonian
of the Heisenberg SL(2|N) spin chain.
