Stomatal response and leaf injury of Pisum sativum L. with SO/sub 2/ and O/sub 3/ exposures. II. Influence of moisture stress and time of exposure
Stomatal response during exposure to SO/sub 2/ and O/sub 3/ and subsequent leaf injury were examined in plants of Pisum sativum L. Alsweet grown in a peat-vermiculite medium in controlled environment chambers. Plants developing under moisture stress, induced by drying the medium to 50% of field capacity, exhibited greater stomatal closure during exposures and less than one-fourth the necrosis compared to plants developing in a medium maintained at field capacity. Plants under moisture stress had only a slightly more negative plant water potential (approx. = 4.0 bars) than at field capacity (approx. = 3.4 bars). Plants exposed to pollutants for 2 hours near the beginning or end of a 16-hour light period had greater stomatal closure during exposures and less leaf necrosis than plants exposed during the middle of the light period.
- Research Organization:
- Univ. of Wisconsin, Madison
- OSTI ID:
- 6524586
- Journal Information:
- Plant Physiol.; (United States), Vol. 67:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
60 APPLIED LIFE SCIENCES
59 BASIC BIOLOGICAL SCIENCES
54 ENVIRONMENTAL SCIENCES
OZONE
BIOLOGICAL EFFECTS
STOMATA
BIOLOGICAL FUNCTIONS
SULFUR DIOXIDE
BIOLOGICAL STRESS
CHRONIC EXPOSURE
CONTROLLED ATMOSPHERES
EXPOSURE CHAMBERS
HOURLY VARIATIONS
LEAVES
MOISTURE
PATHOLOGICAL CHANGES
PHOTOPERIOD
PISUM
RESPONSE MODIFYING FACTORS
ATMOSPHERES
CHALCOGENIDES
FUNCTIONS
LEGUMINOSAE
OPENINGS
OXIDES
OXYGEN COMPOUNDS
PLANTS
SULFUR COMPOUNDS
SULFUR OXIDES
VARIATIONS
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)
553000 - Agriculture & Food Technology
551000 - Physiological Systems
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)