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PLANT PHYSIOLOGY , Vol 112, Issue 3 1349-1355, Copyright © 1996 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
Direct Inhibition of Plant Mitochondrial Respiration by Elevated CO2
M. A. Gonzalez-Meler, M. Ribas-Carbo, J. N. Siedow and B. G. Drake
Smithsonian Environmental Research Center, P.O. Box 28, Edgewater, Maryland 21037 (M.A.G.-M., B.G.D.)
Doubling the concentration of atmospheric CO2 often inhibits plant
respiration, but the mechanistic basis of this effect is unknown. We
investigated the direct effects of increasing the concentration of CO2 by
360 [mu]L L-1 above ambient on O2 uptake in isolated mitochondria from
soybean (Glycine max L. cv Ransom) cotyledons. Increasing the CO2
concentration inhibited the oxidation of succinate, external NADH, and
succinate and external NADH combined. The inhibition was greater when
mitochondria were preincubated for 10 min in the presence of the elevated
CO2 concentration prior to the measurement of O2 uptake. Elevated CO2
concentration inhibited the salicylhydroxamic acid-resistant cytochrome
pathway, but had no direct effect on the cyanide-resistant alternative
pathway. We also investigated the direct effects of elevated CO2
concentration on the activities of cytochrome c oxidase and succinate
dehydrogenase (SDH) and found that the activity of both enzymes was
inhibited. The kinetics of inhibition of cytochrome c oxidase were
time-dependent. The level of SDH inhibition depended on the concentration
of succinate in the reaction mixture. Direct inhibition of respiration by
elevated CO2 in plants and intact tissues may be due at least in part to
the inhibition of cytochrome c oxidase and SDH.
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