Effect of Increases in Oxygen Concentration during the Argon-Induced Decline in Nitrogenase Activity in Root Nodules of Soybean.

When intact nodulated roots of soybean (Glycine max L. Merr. nodulated with Bradyrhizobium japonicum strain USDA 16) were exposed to an atmosphere lacking N(2) gas (Ar:O(2) 80:20), total nitrogenase activity (measured as H(2) evolution) and respiration (CO(2) evolution) declined with time of exposure. In Ar-inhibited nodules, when the O(2) concentration in… CONTINUE READING