Influence of soil moisture on macroscopic sulfur dioxide injury to pinto bean foliage
The influence of soil moisture stress on sulfur dioxide (SO/sub 2/) injury to pinto bean foliage was investigated in relation to stomatal conductance rate, soil moisture content, and plant water potential. Pinto bean plants were grown at four soil water potentials (-1/3, -1, -3, and -5 atm) and exposed to 5,720 ..mu..g/m/sup 3/ (2.2 ppm) SO/sub 2/ for 3 hr. Macroscopic injury was severe on plants grown at -1/3 and -1 atm soil water potential and negligible on plants grown at -3 and -5 atm water potential. Injury was highly correlated with percentage of soil moisture, and both injury and soil moisture were highly correlated with stomatal conductance rate and water potential of the plants. The duration of soil moisture stress (1, 2, or 3 days) did not affect the amount of macroscopic injury induced by SO/sub 2/, the stomatal conductance rate, or plant water potential. Stomatal conductance rates of plants grown at -1/3 and -1 atm soil water potential decreased when the plants were exposed to SO/sub 2/, while those of plants grown at -3 and -5 atm soil water potential were not affected by exposure to SO/sub 2/.
- Research Organization:
- Pennsylvania State Univ., University Park
- OSTI ID:
- 5721447
- Journal Information:
- Phytopathology; (United States), Journal Name: Phytopathology; (United States) Vol. 71:11; 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.
BIOLOGICAL STRESS
CHALCOGENIDES
COLLOIDS
DISPERSIONS
GROWTH
INJURIES
LEAVES
LEGUMINOSAE
MOISTURE
OPENINGS
OXIDES
OXYGEN COMPOUNDS
PHASEOLUS
PLANT GROWTH
PLANTS
RESPONSE MODIFYING FACTORS
SENSITIVITY
SOLS
STOMATA
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TOXICITY