Plant Physiol. Drug Metab Dispos
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Plant Physiology 58:563-568 (1976)
© 1976 American Society of Plant Biologists

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Articles

Photosynthesis, Dark Respiration, and Growth of Rumex patientia L. Exposed to Ultraviolet Irradiance (288 to 315 Nanometers) Simulating a Reduced Atmospheric Ozone Column 1

William B. Sisson2 and Martyn M. Caldwell

a Department of Range Science and The Ecology Center, Utah State University, Logan, Utah 84322

Net photosynthesis, dark respiration, and growth of Rumex patientia L. exposed to a ultraviolet irradiance (288-315 nanometers) simulating a 0.18 atm·cm stratospheric ozone column were determined. The ultraviolet irradiance corresponding to this 38% ozone decrease from normal was shown to be an effective inhibitor of photosynthesis and leaf growth. The repressive action on photosynthesis accumulated through time whereas leaf growth was retarded only during the initial few days of exposure. Small increases in dark respiration rates occurred but did not continue to increase with longer exposure periods. A reduction in total plant dry weight and leaf area of approximately 50% occurred after 22 days of treatment, whereas chlorophyll concentrations remained unaltered.

2 Current address: Jornada Experimental Range, New Mexico State University, P.O. Box 698, Las Cruces, N. M. 88001.

1 This research was supported, in part, by the United States Department of Transportation and the National Aeronautics and Space Administration.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1976 by the American Society of Plant Biologists