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Plant Physiology 48:178-182 (1971)
© 1971 American Society of Plant Biologists

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Articles

Response of Respiration of Tobacco Leaves in Light and Darkness and the CO2 Compensation Concentration to Prior Illumination and Oxygen

G. H. Heichel

a Department of Ecology and Climatology, The Connecticut Agricultural Experiment Station, New Haven, Connecticut 06504

The course of respiration in control leaves of tobacco (Nicotiana tabacum L.) that were illuminated 4 to 5 hours and then darkened 0.25 to 10 hours and in tobacco leaves starved of carbohydrate by 14 hours or more of darkness was measured as CO2 efflux in light and darkness into CO2-free atmospheres containing 0.04, 2.23, 21, 40, and 100% O2.

Control and starved leaves showed a postillumination burst of CO2 that differed from the usual rapid postillumination burst of control leaves in its onset and duration and its sensitivity to O2 and starvation. Relative to control leaves, starved leaves lacked the initial postillumination burst of photorespiration and the O2-stimulated CO2 efflux in the light, but these characteristics were regained when starved leaves were permitted to assimilate CO2 from air or N2 for as little as 20 minutes. Five respiratory patterns of CO2 evolution, two in the light and three in darkness, were identified by manipulating light, darkness, starvation, and O2 concentration.

The CO2 compensation concentrations varied with O2 but were alike in control and starved leaves regardless of the presence or absence of photorespiratory characteristics and rates of respiration in light and darkness.






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Copyright © 1971 by the American Society of Plant Biologists