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Nitrate Reductase in Barley Roots under Sterile, Low Oxygen Conditions ¹

^a Department of Agronomy, University of Kentucky, Lexington, Kentucky 40506

Levels of nitrate reductase activity (EC 1.9.6.1.) as high as 11 µmoles nitrite produced/hour gram fresh weight were found in barley (Hordeum vulgare cv. Compana) roots grown under low oxygen conditions. Roots of plants given identical treatment under sterile conditions did not develop the high levels of nitrate reductase activity. The results suggest that the buildup of particulate, reduced viologen-utilizing nitrate reductase reported in barley roots may be caused by bacterial contamination. The nitrate reductase activity in roots grown under low oxygen conditions was not specific for reduced nicotinamide adenine dinucleotide like the assimilatory nitrate reductase (EC 1.6.6.1.) normally found in aerated plant roots.

¹ This work represents a portion of a dissertation submitted by D. G. B. to the Graduate School at the University of Kentucky in 1972, in partial fulfillment of the requirement for a Ph.D. degree.