Isoflavonoid formation as an indicator of UV stress in bean (Phaseolus vulgaris L.) leaves
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- 27491
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CIAT Library Document collection CINFOS | Document Collection CINFOS | 27491 (Browse shelf(Opens below)) | c.1 | Short Loan | 100062485 |
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La induccion del pigmento isoflavonoide, cumestrol, en hojas primordiales de frijol var. Saxa por radiacion UV se utilizo como un marcador cuantificable para el dano causado por UV a un sistema vegetal. El cumestrol solamente fue inducido por longitudes de onda por debajo de 300 nm y su formacion pudo invertirse mediante el tratamiento con luz blanca y no luz roja despues del periodo de irradiacion con UV. La formacion de cumestrol por UV tambien logro evitarse durante un periodo de 14 h mediante la irradiacion simultanea con luz azul, siempre y cuando la tasa de fluencia del azul fuera lo suficientemente alta. Los resultados indican que la formacion de cumestrol esta mediada por la formacion de un dimero de pirimidina inducido por UV en el ADN de la planta y se discuten las propiedades fotorreparadoras de la luz azul respecto a los posibles aumentos en UV solar debido al agotamiento del O3 en la estratosfera. (RA-CIAT) spa
Induction of the isoflavonoid pigment, coumestrol, in primary leaves of bean var. Saxa by UV radiation was used as a quantifiable marker for UV damage to a plant system. Coumestrol was induced only by wavelengths below 300 nm 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 h 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 O3 depletion. (AS) eng