Physiological and genetic response of Pinus strobus L. clones to sulfur dioxide
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
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Genetic control of sulfur dioxide and ozone tolerance in eastern white pine
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Related Subjects
54 ENVIRONMENTAL SCIENCES
CONIFERS
SENSITIVITY
OZONE
ENVIRONMENTAL EFFECTS
GENETIC EFFECTS
SYNERGISM
SULFUR DIOXIDE
CHEMICAL ANALYSIS
CLONING
THIN-LAYER CHROMATOGRAPHY
TOLERANCE
BIOLOGICAL EFFECTS
CHALCOGENIDES
CHROMATOGRAPHY
OXIDES
OXYGEN COMPOUNDS
PLANTS
SEPARATION PROCESSES
SULFUR COMPOUNDS
SULFUR OXIDES
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)