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The BRST quartet mechanism in infrared Landau gauge QCD is investigated.Based on the observed positivity violation for transverse gluons $A_{\mathrm{tr}}$ the field content of the non-perturbative BRST quartet generated by$A_{\mathrm {tr}}$ is derived. To identify the gluon's BRST-daughter state aswell as the Faddeev-Popov--charge conjugated second parent state, a truncatedBethe-Salpeter equation for the gluon-ghost bound state in the adjoint colourrepresentation is derived and studied. This equation is found to be compatiblewith the so-called scaling solutions of functional approaches. Repeating thesame construction for quarks instead of $A_{\mathrm {tr}}$ leads in a similarway to a truncated Bethe-Salpeter equation for the quark-ghost bound state inthe fundamental representation. Within the scaling solution the infrareddivergence of the quark-gluon vertex is exactly the right one to make thisBethe-Salpeter equation infrared consistent.

Features of ghost-gluon and ghost-quark bound states related to BRST quartets