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    STUDIA BIOLOGIA - Issue no. 1 / 2005  
         
  Article:   ACTIVITATEA FOTOCHIMICĂ A FOTOSISTEMULUI PSII ÎN PREZENŢA LUMINII ÎN EXCES ŞI REFACEREA ACESTEIA LA ÎNTUNERIC, LA ALGA VERDE CHLORELLA FUSCA.

Authors:  VICTOR BERCEA, ANA NICOARĂ, NICOLAE DRAGOŞ.
 
       
         
  Abstract:  The PS II Photosystem’s Photochemical Activity in the Presence of Exces Light and its Recovery in Dark at the Green Alga Chlorella fusca. In vivo activity of PS II under different light intensities and exposure times are described. The recovery period results are also presented. The increase of F0 value, respective the decrease of Fm lead to a drop in the Fv value. Due to Fv diminishing values the nonphotochemical dissipation of excitation energy (qN) increased. At high light intensities the excitation light captured by PS II reaction centers was altered because the number of open centers decreased. Varying with light intensity and exposure time, the quantum yield decreased. The non-cyclic electron transport rate increased with light intensity. Photochemical quenching (qP) and nonphotochemical fluorescence quenching (qN) seems to be correlated with light intensity. During the recovery period the PS II activity was characterized by Fv reaching control values, altered photochemical efficiency and quantum yield with non-cyclic electron transport.  
         
     
         
         
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