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Main Title Effects of Ultraviolet-B Irradiance on Soybean. V. The Dependence of Plant Sensitivity on the Photosynthetic Photon Flux Density during and After Leaf Expansion.
Author Mirecki, R. M. ; Teramura, A. H. ;
CORP Author Maryland Univ., College Park. Dept. of Botany.;Corvallis Environmental Research Lab., OR.
Year Published 1984
Report Number EPA-R-808035; EPA-600/J-84-028;
Stock Number PB84-206622
Additional Subjects Radiation effects ; Plants(Botany) ; Soybean plants ; Sensitivity ; Photosynthesis ; Leaves(Botany) ; Reprints ; Glycine max
Library Call Number Additional Info Location Last
NTIS  PB84-206622 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 9p
Soybeans (Glycine max (L.) Merr. cv Essex) were grown in a green house, and the first trifoliate leaf was either allowed to expand under a high photosynthetic photon flux density (PPFD) (1.4 millimoled per square meter per second) or a low PPFD (0.8 Millimoles per square meter per second). After full leaf expansion, plants from each treatment were placed into a factorial design experiment with two levels of ultraviolet-B (UV-B) radiation (0 and 80 milliwatts per square meter biologically effective UV-B) and two levels of concomitant PPFD (0.8 and 1.4 millimoles per square meter per second) resulting in a total of eight treatments. Measurements of net photosynthesis and the associated diffusion conductances, ribulose-1,5-bisphosphate carboxylase activity, chlorophyll and flavonoid concentrations, and leaf anatomy were examined for all treatments.