Catalyzes 11-beta, 17-beta-hydroxysteroid and reduces 17-beta-ketosteroids. Involved in regulating plant growth and development, probably promoting or mediating brassinosteroid effects. Plays a role during seed maturation. an 11beta-hydroxysteroid + NADP(+) = an 11-oxosteroid + H(+) + NADPH Expressed in the above-ground part of seedlings, especially in the vascular tissues. Also detected in the buds and silique pedicels. Highly induced in oil-accumulating tissues of maturing seeds. Firstly detected during early seed maturation, at 9 days after anthesis (DAA), peaking at 18 DAA, before falling sharply during late maturation. By brassinosteroids (BRs). Up-regulated by LEC2. Semidwarf phenotype with reduced sensitivity to brassinosteroids (BRs) and enhanced sensitivity to abscisic acid (ABA) during germination. Belongs to the short-chain dehydrogenases/reductases (SDR) family.