The Effect of Chronic Ozone Exposures on the Metabolite Content of Ponderosa Pine Seedlings
Ponderosa pine (Pinus ponderosa Laws.) seedlings were grown in field exposure chambers and fumigated with ozone at a concentration of 200 g/m³ 6 h/day; 7 days/wk for variable periods up to 20 weeks. Pines were harvested at 4 wk intervals to determine the levels of the metabolites in tops (stem and needles) and roots. The ozone exposure affected the metabolite pools in the roots and tops differentially. The ozone treatment had no effect on the nitrogen or amino acid content of the tops but increased the levels of these pools in the roots. The levels of soluble sugars, starch, and phenols tended to increase in the tops and decrease in the roots of the ozone-exposed plants. The ozone treatment had no effect on lignin content in either the roots or tops. Forest Sci. 22:234-241.
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Document Type: Journal Article
Affiliations: Biologist, Environmental Protection Agency, 200 S.W. 35th Street, Corvallis, Oregon 97330
Publication date: 1976-09-01
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- Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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