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From an SU(2)$\otimes $SU(2) chiral quark potential model incorporatingspontaneous chiral symmetry breaking the asymptotic $\pi $ and $\sigma $exchange pieces of the $NN$ potential are generated. From them the $\pi NN$ and$\sigma NN$ coupling constants can be extracted. The generalization toSU(3)$\otimes $SU(3) allows for a determination of $\pi B_{8}B_{8}$ and $%\sigma B_{8}B_{8}$ coupling constants according to exact SU(3) hadron symmetry.The implementation of the values of the couplings at $Q^{2}=0$ provided by QCDsum rules and/or phenomenology makes also feasible the extraction of themeson-baryon-baryon form factors. In this manner a quite complete knowledge ofthe couplings may be attained.

$\pi B_{8}B_{8}$ and $\sigma B_{8}B_{8}$ couplings from a chiral quark potential model