Record Display for the EPA National Library Catalog

RECORD NUMBER: 24 OF 30

OLS Field Name OLS Field Data
Main Title Protective Mechanisms and Acclimation to Solar Ultraviolet-B Radiation in 'Oenothera stricta'.
Author Robberecht, R. ; Caldwell, M. M. ;
CORP Author Utah State Univ., Logan.
Year Published 1983
Report Number EPA-R-808167; EPA-600/J-83-213;
Stock Number PB84-205186
Additional Subjects Ultraviolet spectra ; Acclimatization ; Plants(Botany) ; Solar radiation ; Leaves(Botany) ; Sensitivity ; Exposure ; Plant tissues ; Damage ; Phenols ; Optical properties ; Ozone ; Dosage ; Proteins ; Comparison ; Reprints ; Oenothera stricta ; Flavonoids
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB84-205186 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 11p
Abstract
Mechanisms of plant protection and acclimation to potentially damaging solar ultraviolet-B (UV-B, 280-320 nm) radiation incident on the Earth's surface were examined in Oenothera stricta. Attenuation of this radiation in the upper leaf epidermis reduces the penetration of UV-B radiation to the mesophyll where damage to physiologically sensitive targets can occur. The epidermis is a highly selective targets can occur. The epidermis is a highly selective radiation filter that can attenuate up to 95% of the incident UV-B radiation and yet transmit between 70% and 80% of the visible radiation. Photosynthetic rates of leaves exposed to UV-B radiation were not significantly reduced at dose rates representative of the radiation flux found in the habitat of this species, but significant photosynthetic depression was observed at dose rates that exceed the field UV-B flux.