Record Display for the EPA National Library Catalog

RECORD NUMBER: 1017 OF 1029

OLS Field Name OLS Field Data
Main Title Water Stress Reduces Ozone Injury via a Stomatal Mechanism.
Author Tingey, D. T. ; Hogsett, W. E. ;
CORP Author Corvallis Environmental Research Lab., OR.
Year Published 1985
Report Number EPA/600/J-85/208;
Stock Number PB86-117447
Additional Subjects Ozone ; Stress(Physiology) ; Injuries ; Bean plants ; Tolerances(Physiology) ; Water ; Leaves(Botany) ; Exposure ; Response ; Chlorophylls ; Ethylene ; Production ; Reprints ; Phaseolus vulgaris ; Abscisic acid ; Stomata
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Status
NTIS  PB86-117447 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation 6p
Abstract
Various studies have shown that water-stressed plants are more tolerant of ozone exposures than are unstressed plants. Two probable explanations for this tolerance are (a) stomatal closure which reduces ozone uptake and (b) biochemical or anatomical changes within the leaves. Phaseolus vulgaris cv Pinto bean plants were established and transferred to membrane systems which controlled the osmotic potential around the roots at -35 or -80 kilopascals for 5 days prior to ozone treatment (0 or 1.0 microliters per liter for 2 hours.) Both water-stressed and unstressed plants were sprayed with various concentrations of abscisic acid to close the stomata or with fusicoccin to induce stomata opening. The abaxial stomatal resistances of primary and trifoliate leaves were measured just prior to ozone exposure. Plant response to ozone was determined by stress ethylene production and chlorophyll loss. Both water stress and abscisic acid induced stomatal closure and reduced ozone injury.