Leaf surface and histological perturbations of leaves of Phaseolus vulgaris and Helianthus annuus after exposure to simulated acid rain
- Manhattan Coll., Bronx, NY
Initial injury to adaxial leaf surfaces of Phaseolus vulgaris and Helianthus annuus occurred near trichomes and stomata after exposure to simulated sulfate acid rain. Lesion frequency was not correlated with density of either stomata or trichomes but was correlated with degree of leaf expansion. The number of lesions per unit area increased with total leaf area. Results suggest that characteristics of the leaf indumentum such as development of trichomes and guard cells and/or cuticle thickness near these structures may be involved in lesion development. Adaxial epidermal cell collapse was the first event in lesion development. Palisade cells and eventually spongy mesophyll cells collapsed after continued, daily exposure to simulated rain of low pH. Lesion development on Phaseolus vulgaris followed a specific course of events after exposure to simulated rain of known composition, application rate, drop size frequency, drop velocities, and frequency of exposures. These results allow development of further experiments to observe accurately other parameters, such as nutrient inputs and nutrient leaching from foliage, after exposure to simulated sulfate acid rain.
- OSTI ID:
- 5070331
- Journal Information:
- Am. J. Bot.; (United States), Vol. 64:7
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACID RAIN
BIOLOGICAL EFFECTS
LEAVES
DISTURBANCES
DOSE-RESPONSE RELATIONSHIPS
EPIDERMIS
HISTOLOGY
INJURIES
LEACHING
NUTRIENTS
PH VALUE
PLANTS
STOMATA
SULFATES
ATMOSPHERIC PRECIPITATIONS
BIOMASS
BODY
DISSOLUTION
ENERGY SOURCES
EPITHELIUM
OPENINGS
ORGANS
OXYGEN COMPOUNDS
RAIN
RENEWABLE ENERGY SOURCES
SEPARATION PROCESSES
SKIN
SULFUR COMPOUNDS
TISSUES
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)