Ozone-induced membrane permeability changes. [Phaseolus vulgaris]

Journal Article · Thu Feb 01 04:00:00 EST 1973 · Am. J. Bot.; (United States)

DOI:https://doi.org/10.2307/2441102· OSTI ID:6798789

Evans, L S; Ting, I P

The effect of 0.5 ppm ozone for 0.5-1 hr on plant cell membrane permeability was ascertained. Permeabilities to both water and solutes were estimated by measuring leaf disc weight changes and following tritiated water and /sup 86/Rb fluxes. Measurements were made immediately after ozone exposure and 24 hr after exposure. The reflection coefficient, sigma, an index of solute permeability, decreased in ozone-treated primary leaves of pinto bean (Phaseolus vulgaris). The latter indicates an increase in membrane solute permeability or internal solute leakage. Water and THO flux estimates both indicated a decrease in membrane permeability to water; both the hydraulic conductivity (L/sub p/) and the water diffusional coefficient (L/sub D/) apparently decreased, an anomaly which is discussed. These data indicate that ozone has a direct effect on membrane function by altering permeability characteristics. It is assumed from these data that cell membranes are primary target sites for ozone injury.

• Research Organization: Univ. of California, Riverside
• OSTI ID: 6798789
• Journal Information: Am. J. Bot.; (United States), Journal Name: Am. J. Bot.; (United States) Vol. 60:2; ISSN AJBOA
• Country of Publication: United States
• Language: English

Related Subjects

500200 -- Environment
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.
ALKALI METAL ISOTOPES
ATMOSPHERES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOLOGICAL EFFECTS
CELL CONSTITUENTS
CELL MEMBRANES
CONTROLLED ATMOSPHERES
DAYS LIVING RADIOISOTOPES
DIFFUSION
HYDROGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
LABELLED COMPOUNDS
LEGUMINOSAE
MEMBRANES
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
OZONE
PERMEABILITY
PHASEOLUS
PHYSIOLOGY
PLANT CELLS
PLANTS
RADIOISOTOPES
RUBIDIUM 86
RUBIDIUM ISOTOPES
TRACER TECHNIQUES
TRITIUM COMPOUNDS
WATER