Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Leaf UV Optical Properties of 'Rumex patientia' L. and 'Rumex obtusifolius L. in Regard to a Protective Mechanism against Solar UV-B Radiation Injury.
Author Robberecht, R. ; Caldwell, M. M. ;
CORP Author Utah State Univ., Logan. ;Idaho Univ., Moscow.;Corvallis Environmental Research Lab., OR.
Year Published 1987
Report Number EPA/600/D-87/008;
Stock Number PB87-147112
Additional Subjects Solar ultraviolet radiation ; Leaves(Botany) ; Plant genetics ; Optical properties ; Photsynthesis ; Germination ; Plant physiology ; Sensitivity ; Absorbtance ; Rumex patentia L ; Rumex obtusifolius L ; Protective mechanism
Library Call Number Additional Info Location Last
NTIS  PB87-147112 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/21/1988
Collation 13p
Effective UV attenuation in the outer leaf layers may represent an important protective mechanism against potentially damaging solar UV-B radiation. Epidermal optical properties for Rumex patientia and Rumex obtusifolius were examined on field collected and greenhouse grown plants. Rumex patientia, a relatively UV-B sensitive plant, has substantially higher epidermal UV transmittance than Rumex obtusifolius, which indicated that the UV-B flux at the mesophyll layer for Rumex obtusifolius by 27% after exposure to solar UV-B radiation. Flavonoid extract absorbance also increased in whole leaves of both species after solar UV-B radiation. The epidermis is not only an effective filter for UV-B radiation, but is wavelength selective, and shows a degree of plasticity in this attenuation.