  We collected photometrical and dynamical data for 73 low red-shift (z<0.2)
Radio Galaxies (LzRG) in order to study their Fundamental Plane (FP). For 22
sources we also present new velocity dispersion data, that complement the
photometric data given in our previous study of LzRG (Govoni et al. 2000a). It
is found that the FP of LzRG is similar to the one defined by non-active
elliptical galaxies, with LzRG representing the brightest end of the population
of early type galaxies. Since the FP mainly reflects the virial equilibrium
condition, our result implies that the global properties of early--type
galaxies (defining the FP) are not influenced by the presence of gas accretion
in the central black hole. This is fully in agreement with the recent results
in black hole demography, showing that virtually all luminous spheroidal
galaxies host a massive black hole and therefore may potentially become active.
We confirm and extend to giant ellipticals the systematic increase of the
mass-to-light ratio with galaxy luminosity.
