Abstract
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.
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Claims 4
Claim · model-written summary
Only UV wavelengths below 300 nanometers induced coumestrol.
Not reportedComparator
Verbatim
e0“Coumestrol was induced only by wavelengths below 300 nanometers”
e1“beans (Phaseolus vulgaris L. var Saxa)”
Claim · model-written summary
White light after UV reversed coumestrol formation, whereas red light did not.
Verbatim
e0“its formation could be reversed by treatment with white, but not red light after the UV irradiation period”
e1“beans (Phaseolus vulgaris L. var Saxa)”
Claim · model-written summary
Simultaneous blue light prevented UV-induced coumestrol formation for 14 hours when its fluence rate was high enough.
- Taxon
- beanse1
- Treatment
- simultaneous irradiation with blue lighte0
- Outcome
- Formation of coumestrole0
- Direction
- preventede0
- Value
- 14 hourse0
- Qualifier
- blue fluence rate was high enoughe0
Not reportedComparator
Verbatim
e0“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.”
e1“beans (Phaseolus vulgaris L. var Saxa)”
Claim · model-written summary
The authors suggested UV-induced DNA pyrimidine dimers mediated coumestrol formation.
Verbatim
e0“coumestrol formation is mediated via UV-induced pyrimidine dimer formation in the plant DNA”
e1“beans (Phaseolus vulgaris L. var Saxa)”
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