Plant Physiol.
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Plant Physiology 54:829-834 (1974)
© 1974 American Society of Plant Biologists

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Articles

Respiration and Gas Exchange in Stem Tissue of Opuntia basilaris1

Stan R. Szarek2 and Irwin P. Ting

a Department of Biology and the Philip L. Boyd Deep Cayon Desert Research Center, University of California, Riverside, California 92502

Respiration and gas exchange in the light were studied manometrically with tissue slices from stem material of Opuntia basilaris Engelm. and Bigel. Dark respiration rates were greater in young stems than in mature stems. The timing of the experiment in the day/night cycle influences the magnitude and pattern of respiration and gas exchange in the light. Net dark respiration has a temperature optimum between 35 and 40 C, and is maintained at 60% of the control rate in tissue equilibrated with experimental osmotic potentials of –25 bars. Net gas exchange in the light is regulated by the titratable acidity of the tissue and by the tissue temperature. Increased rates of net CO2 evolution and net O2 consumption occur in the light with high levels of titratable acidity and high temperatures. An efflux of CO2 and influx of O2 occur following light/dark transitions. These patterns are reversed following dark/light transitions. Similar results were demonstrated at 15, 25, and 35 C, and are interpreted as a mechanism of adaptation to desert environments.

2 Present address: Department of Botany and Microbiology, Arizona State University, Tempe, Ariz. 85281.

1 This research was supported by National Science Foundation Grant GB 15886, through the United States International Biological Program (Desert Biome) and the University of California Chancellor's Patent Fund.






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Copyright © 1974 by the American Society of Plant Biologists