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    STUDIA BIOLOGIA - Issue no. 1 / 2008  
         
  Article:   THE KINETICS OF CHLOROPHYLL FLUORESCENCE INDUCEMENT IN STATE TRANSITION IN MOUGEOTIA GREEN ALGA, STRAIN AICB 560.

Authors:  VICTOR BERCEA, ADRIANA BICA, NICOLAE DRAGOŞ. 		 
       
         
  Abstract:  The photochemical kinetics of the photosystems, based on the evolution of chlorophyll fluorescence in state transitions and in the presence of some photosynthetic inhibitors was studied in Mougeotia cells. The state 1 was induced by excitation with far-red light 1 (720 nm) and light 2 (665 nm) for the state 2, respectively, in aerobic conditions and in the presence of 2 µM FCCP. The reaction centers ratio, the photochemical activity and the plastoquinone reduction increased in state 1, in the presence of 300 µM DCMU, 20 µM DBMIB and 230 mM chloramphenicol. The oxidation state of plastoquinone and the usage of excitation light in photochemistry increased without a non-photochemical dissipation of the excitation in state 2. DCMU reduces the photochemical efficiency and the yield because of the photoinhibition. The inhibitors combination, which promotes PS I oxidation, induced the plastoquinone reduction state due to the PS I electrons. In state 1-state 2 transition, light 2 contributes to increasing of the open reaction centers ratio and so, the plastoquinone may function in high oxidative conditions. The state 2-state 1 transition increases the ratio of the open reaction centers.  
         
     
         
         
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