The Effects Of Ozone On Tobacco And Pinto Bean as Conditioned by Several Ecological Factors |
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| Authors: | Walter W Heck John A Dunning |
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| Institution: | U. S. Department of Health, Education, and Welfare , National Center for Air Pollution Control Public Health Service , Cincinnati , Ohio , USA |
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| Abstract: | The sensitivity of tobacco and/or pinto bean to ozone, as an air pollutant, is increased by growing plants in a shortened photoperiod under reduced light intensity and in a light potting mix. Sensitivity also is influenced by carbon dioxide concentration, time of day, and age of plant at time of exposure. Plants are more severely injured by a given dose under continuous exposure than when the exposure is split into two time periods. Tobacco shows cumulative development of injury when exposed to low concentrations intermittently over several days. |
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