Record Display for the EPA National Library Catalog

RECORD NUMBER: 155 OF 232

OLS Field Name OLS Field Data
Main Title Photosynthesis, Carbon Allocation, and Growth of Sulfur Dioxide Ecotypes of 'Geranium carolinianum' L.
Author Taylor, G. E. ; Tingey, D. T. ; Gunderson, C. A. ;
CORP Author Corvallis Environmental Research Lab., OR. ;Oak Ridge National Lab., TN. Environmental Sciences Div.
Year Published 1986
Report Number EPA/600/J-86/434;
Stock Number PB88-153861
Additional Subjects Toxicology ; Sulfur dioxide ; Photosynthesis ; Reprints ; Air pollution effects(Plants) ; Geranium carolinianum ; Carbon allocation
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB88-153861 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/21/1988
Collation 10p
Abstract
The study investigated ways in which genetically determined differences in SO2 susceptibility resulting from ecotypic differentiation in Geranium carolinianum were expressed physiologically. The SO2-resistant and SO2-sensitive ecotypes were exposed to a combination of short- and long-term SO2 exposures to evaluate the responses of photosynthesis, H2S efflux from foliage (sulfur detoxification), photoassimilate retention, leaf-diffusive resistance to CO2, and growth. Although physiological accommodation of SO2 stress was observed in both ecotypes, it was more pronounced in the resistant ecotype. The physiological mechanisms underlying genetic differences in G. carolinianum in response to SO2 stress were concluded to be (1) dissimilar threshold levels of response to SO2 and/or its toxic derivatives and (2) differences in homeostatic processes governing the rate of repair or compensation for physiological injury.