  We present Na, Mg and Al abundances in a set of 98 stars with known giant
planets, and in a comparison sample of 41 ``single'' stars. The results show
that the [X/H] abundances (with X = Na, Mg and Al) are, on average, higher in
stars with giant planets, a result similar to the one found for iron. However,
we did not find any strong difference in the [X/Fe] ratios, for a fixed [Fe/H],
between the two samples of stars in the region where the samples overlap.
Finally, the data was used to study the Galactic chemical evolution trends for
Na, Mg and Al, and to discuss the possible influence of planets on this
evolution. The results, in general similar to the ones obtained by other
authors, show that the [X/Fe] ratios all decrease as a function of metallicity
up to solar values. While for Mg and Al this trend then becomes relatively
constant, for Na we find indications of an upturn up to [Fe/H] values close to
0.25dex. For metallicities above this value the [Na/Fe] becomes constant.
