[Enzymatic reduction of legoglobin].

During incubation in the buffer bacteroids Rizobium lupini liberate an enzymic system (ferri-Lb-reductase) capable of reducing ferri-Lb and ferri-Mb The hemoproteids reduction required the presence of cofactors (NADPH or NADH). The ferri-Lb-reductase activity was also found in the soluble fraction of nodules. It is assumed that bacteroids ferri-Lb-reductase, maintains Lb in a physiologically active reduced state into vegetable cells of the nodules "in vivo" as well.