Ozone dosage response of ponderosa pine seedlings

Journal Article · Sun Jun 01 04:00:00 EDT 1969 · J. Air Pollut. Control Assoc.; (United States)

DOI:https://doi.org/10.1080/00022470.1969.10466510· OSTI ID:6296506

Miller, P R; Parmeter, Jr, J R; Flick, B H; Martinez, C W

Photochemical oxidant injury to ponderosa pine (Pinus ponderosa Laws) is a severe problem in the southern California mountains. Three-year-old ponderosa pines fumigated in controlled environment chambers with ozone at 0.15, 0.30, or 0.45 ppm had apparent photosynthesis rates reduced by 10, 70, and 85%, respectively, after 30 days exposure. A fumigation with 0.30 ppm ozone for 33 days depressed the cold perchloric acid extracted polysaccharides of both current and one-year-old needles by 40%. The 80% ethanol soluble sugar concentration of current year, ozone-injured needles increased 16% and that of the one-year-old needles decreased slightly. Both carbohydrate fractions of control trees in carbon-filtered air increased moderately. Higher, endogenous concentrations of ascorbic acid in needles did not protect the tissue from ozone injury. Apparent photosynthesis rate was a sensitive index for ozone dosage response. Needle carbohydrate depletion probably induces premature abscission. 18 references, 1 figure, 1 table.

• Research Organization: Univ. of California, Berkeley
• OSTI ID: 6296506
• Journal Information: J. Air Pollut. Control Assoc.; (United States), Journal Name: J. Air Pollut. Control Assoc.; (United States) Vol. 19:6; ISSN JPCAA
• 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.
BIOLOGICAL EFFECTS
CALIFORNIA
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CONIFERS
DOSE-RESPONSE RELATIONSHIPS
FEDERAL REGION IX
INHIBITION
INJURIES
LEAVES
METABOLISM
MOUNTAINS
NORTH AMERICA
OZONE
PHOTOCHEMICAL OXIDANTS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PINES
PLANTS
SAN BERNARDINO MOUNTAINS
SEEDLINGS
SYNTHESIS
TREES
USA