The least degree of identities in the subspace $M_1^{(m,k)}(F)$ of the matrix superalgebra $M^{(m,k)}(F)$

We determine the least degree of identities in the subspace $M_1^{(m, k)}(F)$ of the matrix superalgebra $M^{(m, k)}(F)$ over the field $F$ for arbitrary $m$ and $k$. For the subspace $M_1^{(m, k)}(F)$ $(k>1)$ we obtain concrete minimal identities and generalize some results by Chang and Domokos.