Some effects of oxidant air pollutants (ozone and peroxyacetyl nitrate) on the ultrastructure of leaf tissues. [Phaseolus vulgaris; Nicotiana tabacum; Gossipyum hirsutum]
Electron microscopic examination of leaves from bean (Phaseolus vulgaris L.) tobacco (Nicotiana tabacum L.) and cotton (Gossipyum hirsutum L.) fumigated for .5 to 2 hours with 0.3 - 1 ppm of the individual oxidants revealed that changes in the ultrastructure of the cells occurred in a sequential fashion with time following the fumigation period. Although occasional cells showed severe damage immediately after fumigation, the most obvious change was an enhanced clarity of the cell membranes. Subsequently, and often prior to the appearance of any visual symptoms of damage, changes in the chloroplasts and mitochondria are observed. In bean and cotton the chloroplast stroma becomes denser and ordered arrays of granules and fibrils develop in the stroma. In tobacco the ordered arrays of granules did not occur but the stroma increased in density and grana frequently had a curvilinear appearance. However, determination of chloroplast axial ratios indicated a general decrease in volume of the tobacco chloroplasts in the fumigated plants as compared to control non-treated plants. The increase density of the stroma, formation of fibrils, and general decrease in volume is probably the result of an increase dehydration of the chloroplasts brought on by permeability changes induced by the pollutants.
- Research Organization:
- Univ. of California, Riverside
- OSTI ID:
- 5262711
- Journal Information:
- Proc. - Annu. Meet., Electron Microsc. Soc. Am.; (United States), Vol. 30
- Country of Publication:
- United States
- Language:
- English
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Effects of peroxyacetyl nitrate on ultrastructure of chloroplasts
Related Subjects
COTTON PLANTS
INJURIES
NICOTIANA
OZONE
TOXICITY
PEROXYACETYL NITRATE
PHASEOLUS
PHOTOCHEMICAL OXIDANTS
PLANT CELLS
ULTRASTRUCTURAL CHANGES
AIR POLLUTION
CELL MEMBRANES
CHLOROPLASTS
ELECTRON MICROSCOPY
LEAVES
PERMEABILITY
SYMPTOMS
CELL CONSTITUENTS
ESTERS
LEGUMINOSAE
MEMBRANES
MICROSCOPY
MORPHOLOGICAL CHANGES
NITRATES
NITRIC ACID ESTERS
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PLANTS
POLLUTION
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)