  The change of the Kronecker structure of a matrix pencil perturbed by another
pencil of rank one has been characterized in terms of the homogeneous invariant
factors and the chains of column and row minimal indices of the initial and the
perturbed pencils. We obtain here a new characterization in terms of the
homogeneous invariant factors and the conjugate partitions of the corresponding
chains of column and row minimal indices of both pencils.
  We also define the generalized Weyr characteristic of an arbitrary matrix
pencil and obtain bounds for the change of it when the pencil is perturbed by
another pencil of rank one. The results improve known results on the problem,
hold for arbitrary perturbation pencils of rank one, and for any algebraically
closed field.
