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    STUDIA BIOLOGIA - Issue no. 2 / 2000  
         
  Article:   UV-B-INDUCED DAMAGE AND RECOVERY OF PHOTOSYNTHETIC ACTIVITY IN THE CYANOBACTERIUM SYNECHOCYSTIS.

Authors:  COSMIN IONEL SICORA, MIHAIL DRĂGAN-BULARDA, IMRE VASS.
 
       
         
  Abstract:  Due to human activity the amount of ozone-depleting substances in the stratosphere increases dramatically. As a consequence, the level of photosynthetically relevant UV radiation reaching the Earths surface raises. In this study we intended to detect how the UV-B influences the photosynthetic efficiency of cyanobacteria and their capacity of recovering after the stress. We also studied the temperature dependence of the damage and the recovery process. Our conclusions show that the PS II protein complex appears to be one of the main targets of UV-B radiation in cyanobacteria and that the recovery process after UV-B damage is a complex one which depends on many factors.  
         
     
         
         
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