Mo. Rev. Stat. § 443.290
All mortgages of real property or security agreements providing for a security interest in personal property, or both, with powers of sale in the mortgagee or secured party, and all sales made by such mortgagee, secured party or his personal representatives, in pursuance of the provisions of the mortgages or security agreements, shall be valid and binding by the laws of this state upon the mortgagors and debtors, and all persons claiming under them, and shall forever foreclose all right and equity of redemption of the property so sold. Nothing herein shall be construed to affect in any way the rights of a tenant to the growing and unharvested crops on lands foreclosed as aforesaid, to the extent of the interest of the tenant under the terms of contract or lease between the tenant and the mortgagor or his personal representatives.
§ 443.290, RSMo
RSMo 1939 § 3462, A.L. 1965 p. 114