Ozone injury to the foliage of Pinus ponderosa
Needles of ponderosa pine treated with 0.5 ppm ozone for 9-18 days under field conditions developed a chlorotic mottle, terminal die-back, and abscission similar to the needle symptoms of chlorotic decline. The chlorophyll content of needles treated with ozone for 18 days was generally less than that of ambient air controls. The chlorophyll content of needles treated with filtered air was greater than that of control needles and the amount of needle abscission was markedly reduced. Continuous air sampling for a 16-day period indicated an average daily peak oxidant concentration of 0.09 ppm in the stands of declining ponderosa pine. Smog has been associated with plant damage in the nearby San Bernardino Valley for at least 10 years. This evidence suggests that the ozone component of photochemical smog may be the principal cause of the chlorotic decline of ponderosa pine in the San Bernardino Mountains.
- Research Organization:
- Univ. of California, Berkeley
- OSTI ID:
- 5366543
- Journal Information:
- Phytopathology; (United States), Journal Name: Phytopathology; (United States) Vol. 53; ISSN PHYTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AIR POLLUTION
BIOLOGICAL EFFECTS
BIOLOGICAL STRESS
CALIFORNIA
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHLOROPHYLL
CONIFERS
DATA
EXPERIMENTAL DATA
FEDERAL REGION IX
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
INJURIES
LEAVES
NORTH AMERICA
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OZONE
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHYTOCHROMES
PIGMENTS
PINES
PLANTS
POLLUTION
PORPHYRINS
SMOG
SYNTHESIS
TREES
USA