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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
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
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
Abstract
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.