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    STUDIA BIOLOGIA - Issue no. 2 / 2008  
         
  Article:   THE ENZYMATIC ACTIVITY OF THE ANTIOXIDATIVE SYSTEM IN GREEN ALGA MOUGEOTIA SP. DURING THE STATE 2 TRANSITION, IN THE PRESENCE OF ASCORBATE AND HYDROGEN PEROXIDE.

Authors:  BOGDAN DRUGĂ, VICTOR BERCEA. 		 
       
         
  Abstract:  The activity of the antioxidative enzymes under light stress was studied, in the presence of various ascorbate concentrations and throughout the intensification of the oxidative factor (H2O2) during state 2 transition. The SOD activity has been enhanced under intense light and in the presence of H2O2. During state 2, in the presence of DCMU, the electrons are used in the PS I for the deactivation of the reactive oxygen species. The APX activity was intensified with and with ascorbate 20 mM, 30 mM and with H2O2. The MDAR activity was reduced excepting the samples with ascorbate 20 mM and 30 mM. The DHAR activity was considerably reduced, while the GR activity was intensified in the presence of ascorbate and H2O2. The concentration of 20 mM ascorbate has enhanced the NADPH-dehydrogenase activity, while H2O2 has produced a slight inhibition. The intensification of lipid peroxidation was emphasized. During state 2, in the presence of 10 mM ascorbate there was observed a very high accumulation of TBARS reactive species. The activity of the antioxidative enzymes induced during state 2 certifies the high accumulation of the photosynthetic reducing equivalents of the reactive oxygen species through the Mehler reaction.

KEYWORDS: lipid peroxidation, light stress, reactive oxygen species 		 
         
     
         
         
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