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OtherMembranes and Bioenergetics
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Sulfide-Resistant Respiration in Leaves of Elodea canadensis Michx

Comparison with Cyanide-Resistant Respiration

Joaquim Azcón-Bieto, Miquel Ribas-Carbó, Miquel A. González-Meler, Josep Peñuelas
Joaquim Azcón-Bieto
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Miquel Ribas-Carbó
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Miquel A. González-Meler
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Josep Peñuelas
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Published August 1989. DOI: https://doi.org/10.1104/pp.90.4.1249

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Abstract

The rate of dark O2 uptake of Elodea canadensis leaves was titrated with either cyanide or sulfide in the presence and in the absence of 5 millimolar salicylhydroxamic acid (SHAM), an inhibitor of the alternative oxidase. The inhibition of O2 uptake by SHAM alone was very small (3-6%), suggesting that actual respiration mainly occurred through the cytochrome pathway. O2 uptake was slightly stimulated by cyanide at concentrations of 50 micromolar or higher, but in the presence of SHAM respiration was strongly suppressed. The effects of sulfide on O2 uptake were similar to those of cyanide, except that the percent stimulation of O2 uptake by sulfide alone was somewhat higher than that of cyanide. However, the estimates of the capacity of the alternative pathway were similar with both inhibitors. Another difference is that maximal inhibition of respiration in the presence of SHAM was observed with lower concentrations of sulfide (50 micromolar) than cyanide (250 micromolar). The results suggest that sulfide can be used as a suitable inhibitor of cytochrome c oxidase in studies with intact plant tissues, and that sulfide does not apparently inhibit the alternative oxidase.

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Sulfide-Resistant Respiration in Leaves of Elodea canadensis Michx
Joaquim Azcón-Bieto, Miquel Ribas-Carbó, Miquel A. González-Meler, Josep Peñuelas
Plant Physiology Aug 1989, 90 (4) 1249-1251; DOI: 10.1104/pp.90.4.1249

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Sulfide-Resistant Respiration in Leaves of Elodea canadensis Michx
Joaquim Azcón-Bieto, Miquel Ribas-Carbó, Miquel A. González-Meler, Josep Peñuelas
Plant Physiology Aug 1989, 90 (4) 1249-1251; DOI: 10.1104/pp.90.4.1249
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Plant Physiology
Vol. 90, Issue 4
August 1989
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  • Effects of Deuterium Oxide on Growth, Proton Extrusion, Potassium Influx, and in Vitro Plasma Membrane Activities in Maize Root Segments
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