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The effect of 0.25 to 0.30 microliter per liter ozone on photosynthesis and respiration and on the ATP and total adenylate content of the primary leaves of pinto beans (Phaseolus vulgaris L.) was examined. Changes in these parameters over a 72-hour time period were correlated with the development of symptoms of ozone toxicity. Toxicity symptoms normally appeared within 24 hours. The content of ATP and total adenylates increased immediately following a 3-hour exposure to ozone. Photosynthesis was depressed initially, but returned to normal within 24 hours. Respiration was not always altered initially, but it was significantly stimulated within 24 hours. We interpret the results to mean that the changes in adenylate content and photosynthesis are early events in the initiation of ozone damage and that the change in respiration is a consequence rather than a cause of cellular injury.

plant physiology

Changes in Respiration, Photosynthesis, Adenosine 5′-Triphosphate, and Total Adenylate Content of Ozonated Pinto Bean Foliage as They Relate to Symptom Expression