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We take up again the study of the mass spectrum of the quark sector in amodel with gauge symmetry $SU(3)_{c}\otimes SU(3)_{L}\otimes U(1)_{X}$ (331).In a special type II-like 331 model, we obtain specific zero-texture massmatrices for the quarks which predict four massless quarks ($u,c,d,s$) and twomassive quarks ($b,t$) at the electroweak scale ($\sim $ GeV). By consideringthe mixing between the SM quarks and new exotic quarks at large scalespredicted by the model, we find that a third quark (associated to the charmquark) acquires a mass. The remaining light quarks ($u,d,s$) get small masses($\sim$ MeV) via radiative corrections.

Radiative seesaw-type mechanism of quark masses in SU(3\)_{C}\otimes SU(3\)_{L}\otimes U\(1\)_{X}$