Ozone induced alterations in the metabolite pools and enzyme activities of plants

Conference · Tue Jan 01 04:00:00 EST 1974 · ACS Symp. Ser.; (United States)

OSTI ID:5970054

Tingey, D T

Acute or chronic ozone exposure may reduce plant growth and cause greater reductions in root growth than in top growth. These growth reductions are associated with metabolic alterations. When soybean leaves and pine needles were exposed to ozone, there was an initial decrease in the levels of soluble sugars followed by a subsequent increase. Ozone exposure also caused a decrease in the activity of the glycolytic pathway and the decrease in the activity was reflected in a lowered rate of nitrate reduction. Ozone increased the activities of enzymes involved in phenol metabolism (phenylalanine ammonia lyase and polyphenoloxidase). Leachates from fescue leaves exposed to ozone inhibited nodulation. Ozone-induced reductions in root growth resulted from altered foliage metabolism rather than from direct action upon the roots themselves. Soluble carbohydrates and starch were at lower levels in roots of ponderosa pine exposed to low levels of ozone at the end of the growing season, while the levels of amino acids and Kjeldahl nitrogen were higher. Nodulation of legumes exposed to ozone was reduced suggesting a reduction in the amount of nitrogen fixed per plant. Root exudates from plants exposed to ozone also inhibited root growth and nodulation in other plants. 23 references, 9 figures, 5 tables.

• Research Organization: Environmental Protection Agency, Corvallis, OR
• OSTI ID: 5970054
• Report Number(s): CONF-740349-
• Conference Information: Journal Name: ACS Symp. Ser.; (United States) Journal Volume: 3
• Country of Publication: United States
• Language: English

Related Subjects

560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ACUTE EXPOSURE
AIR POLLUTION
BIOLOGICAL EFFECTS
BIOLOGICAL PATHWAYS
CHRONIC EXPOSURE
COMPARATIVE EVALUATIONS
CONIFERS
DATA
DISPERSIONS
EXPERIMENTAL DATA
GLYCINE HISPIDA
GROWTH
INFORMATION
INHIBITION
LEACHATES
LEAVES
LEGUMINOSAE
MIXTURES
NUMERICAL DATA
OZONE
PINES
PLANT GROWTH
PLANTS
POLLUTION
ROOTS
SOLUTIONS
TREES