  The $L_p$ versions of the support function and polar body are introduced by
Berndtsson, Mastrantonis and Rubinstein in
\cite{Berndtsson-Mastrantonis-Rubinstein-2023} recently. In this paper, we
prove that the $L_p$-support function of the shadow system $K_t$ introduced by
Rogers and Shephard in \cite{rogers-1958-02,shephard-1964} is convex and the
volume of the section of $L_p$ polar bodies of $K_t$ is $\frac{1}{n}$-concave
with respect to parameter $t$, and obtain some related inequalities. Finally,
we present the reverse Rogers-Shephard type inequality for $L_p$-polar bodies.
