UVB radiation effect on primary process of photosynthesis in Spirulina

UV-B radiation reaches earth due to ozone layer depletion and affects both terrestrial and aquatic environment. Photosynthesis in cyanobacteria is prone to UV-B radiation and gets altered. Mainly in cyanobacteria particularly PS-II is susceptible to UV-B radiation and energy transfer gets altered. In addition cyanobacteria adapt several defense mechanisms like induction of antioxidant enzyme activities to scavenge the formed free radicals to protect the system from damage.