Physiological and genetic response of Pinus strobus L. clones to sulfur dioxide

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1971

OSTI ID:6535425

Houston, D B

To study the effects of ozone and sulfur dioxide on eastern white pine (Pinus strobus L.), 47 sensitive and 47 tolerant trees were selected in natural stands and plantations in southern Wisconsin to serve as ortets for clonal propagation. Preliminary fumigation trials were conducted to test the response of the clones to ozone, sulfur dioxide, and a combination of the two pollutants. In the first growing season after grafting, 70 clones (35 sensitive and 35 tolerant) were treated with 20 pphm ozone for six hours. One week later, individual replicates of this study were treated with the same concentration for 12, 24, 48, and 96 hours. In the next growing season, the following concentrations were tested: 2.5, 5, 15, and 45 pphm sulfur dioxide, 5, 10, 30, and 60 pphm ozone, and 2.5 pphm sulfur dioxide plus 5 pphm ozone. Response of the 30 clones (15 sensitive and 15 tolerant) utilized in the trials was judged by needle elongation and two indices of direct needle damage. The initial ozonations of 35 sensitive and 35 tolerant clones were unsuccessful in producing any visible damage on current-year's needles. Studies conducted the following year indicated that sulfur dioxide was the most important factor in the initiation of symptoms characteristic of those noted in the field. Concentrations of 2.5 pphm sulfur dioxide plus 5 pphm ozone injured current-year's needles on all sensitive clones but not on tolerant clones, suggesting a synergistic reaction mechanism for these two fumigants. Ozone trials produced no definite pattern of injury with respect to tolerant and sensitive classes. 99 references, 17 tables, 19 figures.

• OSTI ID: 6535425
• Country of Publication: United States
• Language: English

Related Subjects

500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL EFFECTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHROMATOGRAPHY
CLONING
CONIFERS
ENVIRONMENTAL EFFECTS
GENETIC EFFECTS
OXIDES
OXYGEN COMPOUNDS
OZONE
PLANTS
SENSITIVITY
SEPARATION PROCESSES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SYNERGISM
THIN-LAYER CHROMATOGRAPHY
TOLERANCE