UV-B induced stress responses in three rice cultivars
2010
Fedina, I.,Bulgarian Academy of Sciences, Sofia (Bulgaria). Acad. M. Popov Inst. of Plant Physiology | Hidema, J.,Tohoku Univ., Sendai (Japan). Graduate School of Life Science | Velitchkova, M.,Bulgarian Academy of Sciences, Sofia (Bulgaria). Inst. of Biophysics | Georgieva, K.,Bulgarian Academy of Sciences, Sofia (Bulgaria). Acad. M. Popov Inst. of Plant Physiology | Nedeva, D.,Bulgarian Academy of Sciences, Sofia (Bulgaria). Acad. M. Popov Inst. of Plant Physiology
UV-B responses of three rice cultivars (Sasanishiki, Norin 1 and Surjamkhi) with different photolyase activity were investigated. Carbon dioxide assimilation data support that Sasanishiki was less sensitive to UV-B than Norin 1 and Surjamkhi. UV-B radiation sharply decreased the content of Rubisco protein in Surjamkhi and has no effect in Sasanishiki. The photochemical activities of photosystem (PS) 1 and PS 2 was slightly affected by UV-B treatment. The content of H2O2 and the activities of antioxidant enzymes, catalase (CAT), peroxides (POX) and superoxide dismutase were enhanced after UV-B treatment. The activities of CAT and POX isoenzymes in Sasanishiki were more enhanced by UV-B radiation than those in Norin 1 and Surjamkhi.
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