Isoflavonoid formation as an indicator of UV stress in bean (Phaseolus vulgaris L. ) leaves
Induction of the isoflavonoid pigment, coumestrol (3,9-dihydroxy-6H-benzofuro-(3,2-c)(1) benzopyran-6-one), in primary leaves of beans (Phaseolus vulgaris L. var Saxa) by ultraviolet (UV) radiation was used as a quantifiable marker for UV damage to a plant system. Coumestrol was induced only by wavelengths below 300 nanometers and its formation could be reversed by treatment with white, but not red light after the UV irradiation period. Formation of coumestrol by UV could also be prevented over a period of 14 hours by simultaneous irradiation with blue light provided that the blue fluence rate was high enough. The results suggest that coumestrol formation is mediated via UV-induced pyrimidine dimer formation in the plant DNA and the photorepair properties of blue light are discussed with respect to possible increases in solar UV due to stratospheric ozone depletion.
- Research Organization:
- Universitaet Freiburg, West Germany
- OSTI ID:
- 6429084
- Journal Information:
- Plant Physiol.; (United States), Vol. 79:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DNA
BIOLOGICAL RADIATION EFFECTS
PYRIMIDINE DIMERS
PHOTOREACTIVATION
VISIBLE RADIATION
BIOLOGICAL EFFECTS
BIOLOGICAL MARKERS
PHASEOLUS
PIGMENTS
ULTRAVIOLET RADIATION
BACTERIA
BIOLOGICAL RECOVERY
BIOLOGICAL REPAIR
ELECTROMAGNETIC RADIATION
LEGUMINOSAE
MICROORGANISMS
NUCLEIC ACIDS
ORGANIC COMPOUNDS
PLANTS
RADIATION EFFECTS
RADIATIONS
RECOVERY
REPAIR
RHIZOBIUM
560113* - Radiation Effects on Biochemicals- In Plants- (-1987)