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We present Na, Mg and Al abundances in a set of 98 stars with known giantplanets, and in a comparison sample of 41 ``single'' stars. The results showthat the [X/H] abundances (with X = Na, Mg and Al) are, on average, higher instars 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 forNa, Mg and Al, and to discuss the possible influence of planets on thisevolution. The results, in general similar to the ones obtained by otherauthors, show that the [X/Fe] ratios all decrease as a function of metallicityup to solar values. While for Mg and Al this trend then becomes relativelyconstant, for Na we find indications of an upturn up to [Fe/H] values close to0.25dex. For metallicities above this value the [Na/Fe] becomes constant.Comment: Accepted for publication in A&A; replaced on the 19/04/2005 with new  version updated for language correction

Abundances of Na, Mg and Al in stars with giant planets