An Electron Transport System in Maize Roots for Reactions of Glutamate Synthase and Nitrite Reductase

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Abstract
A non-heme iron containing protein which bears an antigenic similarity to ferredoxin from spinach leaves (Spinacia oleracea L.) has been identified in extracts prepared from young roots of maize (Zea mays L., hybrid W64A × W182E). The ferredoxin-like root electron carrier could substitute for ferredoxin in a cytochrome c reduction system in which pyridine nucleotide (NADPH) reduces the root electron carrier in a reaction catalyzed by ferredoxin-NADP+ reductase (EC 1.6.7.1) from spinach leaves. However, the root electron carrier did not mediate the photoreduction of NADP+ in an illuminated reconstituted chloroplast system.