Plant Physiol.
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Plant Physiology 51:1095-1098 (1973)
© 1973 American Society of Plant Biologists

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Articles

Effects of Carbon Dioxide on Activity of Apple Mitochondria

Michael R. Shipway1 and William J. Bramlage

a Department of Plant and Soil Sciences, University of Massachusetts, Amherst, Massachusetts 01002

Effects of CO2 on mitochondrial activity of apple (Malus pumila Mill. var. Richared Delicious) were studied in two ways. Immediate effects were determined by imposing 3 to 18% CO2-bicarbonate mixtures on isolated apple mitochondria, and long term effects were determined by extracting mitochondria from apples that had been stored for intervals in atmospheres containing 6 or 12% CO2 plus 3% O2. The CO2-bicarbonate systems had immediate and broad effects on mitochondrial oxidations: 18% CO2 stimulated malate oxidation about 10%; suppressed {alpha}-ketoglutarate, citrate, and NADH oxidations about 10%; and suppressed fumarate, pyruvate, and succinate oxidations about 32%. The effects of lower CO2 concentrations varied with substrates. Mitochondria isolated from fruit stored in 6 or 12% CO2 possessed a reduced capacity to oxidize added succinate or NADH, but retained a marked sensitivity to CO2-bicarbonate mixtures. Respiratory control in these mitochondria was somewhat reduced, but CO2 had not acted as a strong uncoupling agent.

1 Present address: Kirton Experimental Horticultural Station, Boston, Lincolnshire, England.




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