Main Title |
Effects of Ultraviolet-B Irradiation on Plants during Mild Water Stress. 1. Effects on Diurnal Stomatal Resistance. |
Author |
Teramura, A. H. ;
Tevini, M. ;
Iwanzik, W. ;
|
CORP Author |
Maryland Univ., College Park. Dept. of Botany.;Corvallis Environmental Research Lab., OR. |
Year Published |
1983 |
Report Number |
CONTRIB-6349; EPA-R-808035; EPA-600/J-83-037; |
Stock Number |
PB84-102524 |
Additional Subjects |
Radiation effects ;
Plants(Botany) ;
Water ;
Stress(Physiology) ;
Reprints ;
Cucumber ;
Cucumis sativus ;
Radish ;
Raphanus sativus ;
Stomata
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB84-102524 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
7p |
Abstract |
Cucumber (Cucumis sativus L. cv. Delikatess) and radish (Raphanus sativus L. cv. Saxa Treib) were grown in a factorial design under two ultraviolet-B (UV-B) irradiances and three levels of water stress. On a weighted, daily dose basis the UV-B radiation treatments were equivalent to ambient levels during the beginning of the growing season (controls) and those predicted for an 11.6% ozone depletion during the summer solstice at 49 deg. N latitude. Water stress was achieved by varying the frequency of watering. The combination of UV-B radiation and water stress resulted in large species differences in the pattern of stomatal resistances. This study indicated that Cucumis is one of the most sensitive crop species to UV-B radiation yet identified and that the primary effect of UV-B radiation in this species is a decrease in the leaf diffusive resistance to water vapor. This, therefore, may result in reductions in growth via increased water stress. |