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• W1996972971 abstract "Influence of growth temperature on the capacity of the mitochondrial alternative pathway of electron transport was investigated using etiolated corn (Zea mays L.) seedlings. These seedlings were grown to comparable size in either a warm (30°C) or a cold (13°C) temperature regime, and then their respiration rates were measured as O2 uptake at 25°C. The capacity of the alternative pathway (KCN-insensitive O2 uptake) was found essentially to double in shoots of cold-grown seedlings. This increased capacity slowly developed over several days growth in the cold, but was lost within 1 day when the seedlings were exposed to a warm regime. When mitochondria were isolated from the shoots of these seedlings, a greater potential for flow through the alternative path was observed in mitochondria from the cold-grown seedlings with all substrates used (an average increase of 84%). Using exogenous NADH as the substrate, the effect of the electrochemical gradient on measurable capacities of the cytochrome and alternative pathways was investigated in mitochondria from both etiolated seedlings and thermogenic spadices. The uncoupler FCCP (p-trifluoromethoxycarbonylcyanide phenylhydrazone) was used to diminish the electrochemical gradient when desired. In corn (Zea mays L.) shoot and mung bean (Vigna radiata L.) hypocotyl mitochondria, which have relatively low capacities of the alternative pathway, increased flow through the cytochrome chain in the absence of the electrochemical gradient was found not to influence the potential for flow through the alternative path. However, in mitochondria from skunk cabbage (Symplocarpus foetidus L.) and voodoo lily (Sauromatum guttatum Schott) spadices, which have high capacities of the alternative pathway, increased flow through the cytochrome chain in the absence of the gradient occurred at the expense of flow through the alternative pathway. These results suggest that in mitochondria of thermogenic spadices, the combined capacities of the cytochrome and alternative paths exceed the capacity of the exogenous NADH dehydrogenase. The effect of assay pH on measurable capacities of the cytochrome and alternative paths was determined over a pH range of 5.6 to 8.8 using exogenous NADH as the mitochondrial substrate. When the electrochemical gradient was present, it limited the electron transport rate and little effect of assay pH was observed. However, when formation of the gradient was prevented through inclusion of FCCP, measurable capacities of the cytochrome and alternative paths were found to be greatly influenced by pH. This experiment also revealed that the potential for respiratory control is largely dependent upon the assay pH." @default.
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• W1996972971 date "1986-02-01" @default.
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• W1996972971 title "Alternative Respiratory Path Capacity in Plant Mitochondria: Effect of Growth Temperature, the Electrochemical Gradient, and Assay pH" @default.
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• W1996972971 doi "https://doi.org/10.1104/pp.80.2.378" @default.
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