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The transconductance and effective Land\'{e} $g^*$ factors for a quantumpoint contact defined in silicene by the electric field of a split gate isinvestigated. The strong spin-orbit coupling in buckled silicene reduces the$g^*$ factor for in-plane magnetic field from the nominal value 2 to around 1.2for the first- to 0.45 for the third conduction subband. However, forperpendicular magnetic field we observe an enhancement of $g^*$ factors for thefirst subband to 5.8 in nanoribbon with zigzag and to 2.5 with armchair edge.The main contribution to the Zeeman splitting comes from the intrinsicspin-orbit coupling defined by the Kane-Mele form of interaction.

Effective Land\'{e} factors for an electrostatically defined quantum point contact in silicene