Histological responses of some plant leaves to hydrogen fluoride and sulfur dioxide
Dicotyledonous plants were fumigated with hydrogen fluoride and/or sulfur dioxide. Samples were taken of injured and control leaves, processed microtechnically, and examined microscopically. Histological responses to hydrogen fluoride and sulfur dioxide were indistinguishable. The spongy mesophyll and lower epidermis first collapsed, followed by distortion and chloroplast disruption in the palisade cells. The upper epidermis finally distorted and collapsed. Microscopically injured leaf tissues were selectively stained with safranin. Various postulates are discussed concerning the means and pathways by which a phytotoxic air pollutant may enter the leaf and produce injury therein. The evidence indicates that should fluoride enter a leaf in sub-phytotoxic concentrations, it is transported acropetally. Should phytotoxic levels be reached, visible marginal injury results.
- Research Organization:
- Univ. of California, Los Angeles
- OSTI ID:
- 6165783
- Journal Information:
- Am. J. Bot.; (United States), Journal Name: Am. J. Bot.; (United States) Vol. 43:10; ISSN AJBOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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.
AIR POLLUTION
ANIMAL TISSUES
BIOLOGICAL PATHWAYS
BODY
CELL CONSTITUENTS
CHALCOGENIDES
CHLOROPLASTS
EPIDERMIS
EPITHELIUM
HISTOLOGICAL TECHNIQUES
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LEAVES
ORGANS
OXIDES
OXYGEN COMPOUNDS
PATHOLOGICAL CHANGES
POLLUTION
SKIN
STAINS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TISSUES
TOXICITY