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Main Title Effects of UV-B Radiation on Plants During Mild Water Stress. II. Effects on Growth, Protein and Flavonoid Content.
Author Tevini, M. ; Iwanzik, W. ; Teramura, A. H. ;
CORP Author Karlsruhe Univ. (Germany, F.R.). ;Maryland Univ., College Park.;Corvallis Environmental Research Lab., OR.
Year Published 1983
Report Number EPA-R-808035; EPA-600/J-83-210;
Stock Number PB84-203272
Additional Subjects Ultraviolet spectra ; Vegetables ; Tolerances(Physiology) ; Water consumption ; Sensitivity ; Closed ecological systems ; Tests ; Growth ; Proteins ; White light ; Comparison ; Reprints ; Foreign technology ; Cucumis sativus ; Raphanus sativus ; Flavonoids
Library Call Number Additional Info Location Last
NTIS  PB84-203272 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 12p
Cucumber (Cucumis sativus) and radish (Raphanus sativus) were grown under several levels of water stress in a growth chamber programmed with a day-night rhythm to simulate the diurnal course of temperature and irradiation. In addition to white light, the seedlings received UV-B radiation equivalent to either ambient levels in the early spring (control) or levels predicted to reach the earth's surface with approximately 12% ozone depletion (enhanced UV-B) at the summer solstice at 49 degrees N latitude. Cotyledon fresh weight and leaf area were reduced in radish by water stress and enhanced UV-B. Cucumber cotyledons were more sensitive to UV-B radiation than radish. This higher sensitivity might be due to reduced levels of protective flavonoid compounds in cucumber. Protein content of radish cotyledons was unaffected by either treatment. This study indicates that cucumber is one of the most UV-B sensitive crop species so far identified with respect to reduced growth and flavonoid content.