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- W2061051819 abstract "Soybean (Glycine max [L.] Merr.) root nodules contain the enzymes of the ascorbate-glutathione cycle for defense against activated forms of oxygen. Nodulated roots of hydroponically grown soybean plants were exposed to atmospheres containing 2, 21, 50, or alternating 21 and 50 kilopascals of O(2). The activities of ascorbate (ASC) peroxidase, monodehydroascorbate (MDHA) reductase, dehydroascorbate (DHA) reductase, and glutathione (GSSG) reductase were higher in nodules exposed to high pO(2). Nodule contents of ascorbate and reduced glutathione were also greater in the high pO(2) treatments. Treatment of nodulated plants with fixed nitrogen (urea) led to concomitant decreases in acetylene reduction activity, in leghemoglobin content, and in activities of ASC peroxidase, DHA reductase, and GSSG reductase. Activity of MDHA reductase and glutathione concentrations in nodules were not affected by treatment with urea. The enzymes of the ascorbate-glutathione cycle were also detected in uninfected soybean roots, although at levels substantially below those in nodules. These observations indicate that the ascorbate-glutathione cycle can adjust to varying physiological conditions in nodules and that there is a key link between N(2) fixation and defenses against activated forms of oxygen." @default.
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- W2061051819 date "1991-07-01" @default.
- W2061051819 modified "2023-09-27" @default.
- W2061051819 title "Effects of Ambient Oxygen and of Fixed Nitrogen on Concentrations of Glutathione, Ascrobate, and Associated Enzymes in Soybean Root Nodules" @default.
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- W2061051819 doi "https://doi.org/10.1104/pp.96.3.812" @default.
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