Responses of soybean leaf metabolism to SO/sub 2/ fumigation. [Glycine max]
Response of glutathione, ascorbate, and H/sub 2/O/sub 2/ concentrations in leaves of higher plants exposed to low levels of O/sub 3/ and SO/sub 2/ was quantified. Glycine max L cv Dare and Williams were grown in a charcoal-filtered air glass house. Exposures to 0.7 ppm SO/sub 2/ for 2 h resulted in minimal effects on photosynthesis, however, at 2 ppm a reduction in photosynthesis was accompanied by a 75% decrease in glutamate and aspartate. Sulfate increased 50% and total free thiol (Ellman-positive material) increased 300%. No significant changes were observed in the total concentration of glutathione or cysteine. No changes were detected in the oxidized to reduced glutathione ratio, and ascorbate and H/sub 2/O/sub 2/ content remained constant. In contrast, fumigations with 0.8 ppm ozone for 2 h resulted in approximately a 30% increase in leaf hydrogen peroxide. No obvious change occurred in ascorbate or glutathione metabolism. Altered pseudocyclic electron flow to H/sub 2/O/sub 2/ may not occur in soybean leaf following exposure to SO/sub 2/.
- Research Organization:
- Virginia Polytechnic Institute and State Univ., Blacksburg
- OSTI ID:
- 5968636
- Report Number(s):
- CONF-8707108-
- Journal Information:
- Plant Physiol., Suppl.; (United States), Journal Name: Plant Physiol., Suppl.; (United States) Vol. 83:4; ISSN PPYSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AMINO ACIDS
ASCORBIC ACID
ASPARTIC ACID
CARBOXYLIC ACID SALTS
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
CYSTEINE
DRUGS
GLUTAMIC ACID
GLUTATHIONE
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
LEAVES
METABOLISM
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
OZONE
PEPTIDES
PEROXIDES
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
POLYPEPTIDES
PROTEINS
RADIOPROTECTIVE SUBSTANCES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SYNTHESIS
THIOLS
TOXICITY
VITAMINS