UV-B induced stress responses in three rice cultivars |
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Authors: | I Fedina J Hidema M Velitchkova K Georgieva and D Nedeva |
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Institution: | (1) Departamento de Qu?mica Biol?gica, Facultad de Farmacia y Bioqu?mica, Universidad de Buenos Aires, Jun?n 956, Buenos Aires, 1113, Argentina;(2) Centro de Investigaciones sobre Porfirinas y Porfirias (CIPYP), CONICET, Buenos Aires, Argentina |
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Abstract: | UV-B responses of three rice (Oryza sativa L.) 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 (SOD) 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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Keywords: | |
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