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• W2385493848 abstract "The Redox system located on the cell surface of peanut seedling hypocotyl tissue has the ability to oxidize exogenous NADH and reduce Fe(CN) _6~(3-). The reaction medium's pH produced a pronounced effect on the redox activity. Under aerobic condition when both NADH and Fe(CN)_6~(3-)were in reaction medium, the rate of NADH oxidation reached 4.54 μmol g~(-1) h~(-1), and the rate of Fe(CN)_6~(3-) reduction reached 3.23 μmol g~(-1) h~(-1) at pH 6.0. When the pH of the medium became 8.0, the rate of NADH oxidation and Fe(CN)_6~(3-) reduction rose to 8.68 and 9.86 μmol g~(-1) h~(-1) respectively. Under anaerobic condition at pH 6. 0, the rate of NADH oxidation dropped to 2.34 μmol g~(-1) h~(-1), and the rate of Fe(CN)_6~(3-) reduction increased to 5.75 μmol g~(-1) h~(-1). DCCD, an inhibitor of electron transport chain, has an inhibitory effect on the redox activity. These data show that oxygen is a natural eletron receptor of this redox system which has at least three component parts, i. e., electron donor oxidase (NADH or natural electron donor oxidase), electron transport chain and electron acceptor reductase (Fe(CN)_6~(3-) reductase).At the time when exogenous NADH and Fe(CN)_6~(3-) are redoxed by peanut seedling hypocotyl tissues, the H~+ extrusion from the tissues is stimulated. This stimulation effect increases with the pH rise of the medium. However under anaerobic condition the H~+ extrusion is weakened. Under aerobic condition at pH 6.0, 100 μmol/L Na_3VO_4, a specific inhibitor of plasma membrane ATPuse, inhibited 48% of H~+ extrusion from hypocotyl tissues. When NADH and Fe(CN)_6~(3-) were added to the reaction medium, the inhibitory effect decreased to 25%, but the absolute quantit of vanadate inhibition was basically unchanged. This shows that the H~+ extrusion comes from at least two systems, the plasma membrane H~+-ATPase (proton pump) and the redox system.The reaction medium's pH also influences the respiratory rate of tissues. At pH 6.0 the uptake rate of oxygen reached 1.39/μmol g~(-1) h~(-1), and at pH 8.0 the rate rose to 1.76 μmol g~(-1) h~(-1). When 1 mmol/L NADH and 1 mmol/L Fe(CN)_6~(3-)were added to the medium, the uptae rate of oxygen increased to 1.64 and 2.17 μmol g~(-1) h~(-1) respectively at pH 6.0 and pH 8.0. It is suggested that a part of H~+ extrusions controlled by the redox system deends on the oxygen." @default.
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• W2385493848 date "1991-01-01" @default.
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• W2385493848 title "Study on the H~+ Extrusion and the Characteristics of Redox System in Peanut Seedling Hypocotyl Tissues" @default.
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