Biologia plantarum 51:699-706, 2007 | DOI: 10.1007/s10535-007-0145-2
UV-B response of green and etiolated barley seedlings
- 1 Institute of Plant Physiology, Bulgarian Academy of Sciences, Sofia, Bulgaria
- 2 Institute of Biophysics, Bulgarian Academy of Sciences, Sofia, Bulgaria
7-d-old etiolated and green barley seedlings (Hordeum vulgare L. cv. Alfa) were irradiated with UV-B for 30 min and then kept for 24 h in light or darkness. Chlorophyll (Chl) synthesis was inhibited by about 30 % as a result of UV-B irradiation, but there were no significant changes in photochemical activity measured by variable to maximum fluorescence ratio (Fv/Fm), quantum yield (ΦPS2) and oxygen evolution rate. Electron transport of etiolated seedlings was similar to that of green ones, nevertheless, the Chl content was more then 2-fold lower. Ribulose-1,5-bisphosphate carboxylase/oxygenase large and small subunits were diminished as a result of UV-B irradiation in etiolated and green plants, especially in those kept in the darkness. Catalase activity decreased and total superoxide dismutase activity increased in green and etiolated plants following UV-B treatment. When benzidine was used as a substrate, an isoform located between guaiacol peroxidases 2 and 3 (guaiacol peroxidase X) appeared, which was specific for UV-B treatment. As a result of irradiation, the contents of UV-B absorbing and UV-B induced compounds increased in green seedlings but not in etiolated seedlings.
Keywords: chlorophyll fluorescence; flavonoids; Hordeum vulgare; oxygen evolution; ribulose-1,5-bisphosphate carboxylase, oxygenase
Subjects: barley; carotenoids; catalase; chlorophyll fluorescence; flavonoids; Hordeum vulgare; malondialdehyde; oxygen evolution; photon flux density (PPFD, PFD); photosystems 1,2; proline; proteins; quaicol peroxidase; ribulose-1,5-bisphosphate carboxylase/oxygenase; superoxide dismutase (SOD); UV radiation, stress
Received: January 16, 2006; Accepted: August 8, 2006; Published: December 1, 2007 Show citation
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