  We study the dc conductivity of iron-based superconductors within the
orbital-selective spin fluctuation scenario. Within this approach, the
anisotropy of spin fluctuations below the spin-nematic transition at T$_S$ is
also responsible for the orbital ordering, induced by nematic self-energy
corrections to the quasiparticle dispersion. As a consequence, the anisotropy
of the dc conductivity below T$_S$ is determined not only by the anisotropy of
the scattering rates as expected within a spin-nematic scenario, but also by
the modification of the Fermi velocity due to the orbital reconstruction. More
interestingly, it turns out that these two effects contribute to the
dc-conductivity anisotropy with opposite signs. By using realistic
band-structure parameters we compute the conductivity anisotropy for both 122
and FeSe compounds, discussing the possible origin of the different
dc-conductivity anisotropy observed experimentally in these two families of
iron-based superconductors.
