  In this paper we study the Yukawa Higgs-quark-quark interactions that are
generated from radiative corrections of squarks and gluinos, in the Minimal
Supersymmetric Standard Model. We compute the corrections to the effective
action for Higgs and quark fields that are produced by explicit integration, in
the path integral formalism, of all the squarks and gluinos, at the one-loop
level and order $\alpha_s$. In addition, we consider the limit of nearly
degenerate heavy squarks and gluinos, with masses much larger than the
electroweak scale, and derive the effective Lagrangian containing all the
relevant new local Higgs-quark-quark interactions. We show that these new
interactions do remain non-vanishing, even in the case of infinitely heavy
supersymmetric particles and, therefore, we demonstrate explicitly the
non-decoupling behavior of squarks and gluinos in Higgs bosons physics. We
present the set of new Yukawa couplings and finally derive the corresponding
one-loop, order $\alpha_s$, corrections to the Higgs bosons partial decay
widths into quarks.

High Energy Physics - Phenomenology;High Energy Physics - Theory