  Using new extensive radio continuum surveys at 1.4 GHz (FIRST and NVSS), we
derive the distribution of the radio/optical and radio/NIR luminosity (RLF) of
late-type (Sa-Irr) galaxies (mp<15.7) in 5 nearby clusters of galaxies: A262,
Cancer, A1367, Coma and Virgo. With the aim of discussing possible
environmental dependences of the radio properties, we compare these results
with those obtained for relatively isolated objects in the Coma supercluster.
We find that the RLF of Cancer, A262 and Virgo are consistent with that of
isolated galaxies. Conversely we confirm earlier claims that galaxies in A1367
and Coma have their radio emissivity enhanced by a factor of 5 with respect to
isolated objects. We discuss this result in the framework of the dynamical
pressure suffered by galaxies in motion through the intra-cluster gas
(ram-pressure). We find that the radio excess is statistically larger for
galaxies in fast transit motion. This is coherent with the idea that enhanced
radio continuum activity is associated with magnetic field compression. The
X-ray luminosities and temperatures of Coma and A1367 imply that these two
clusters have significantly larger intracluster gas density than the remaining
three studied ones, providing a clue for explaining the higher radio continuum
luminosities of their galaxies. Multiple systems in the Coma supercluster
bridge (with projected separations smaller than 300 kpc) have radio
luminosities significantly larger than isolated galaxies.
