Abstract
AbstractUltraviolet sensitivity of two different species of Anabaena, Anabaena doliolum and Anabaena sp. was studied. These two species differ in their pigment composition; A. doliolum showed predominance of phycocyanin whereas Anabaena sp. showed predominance of phycoerythrin pigments. Survival of the two species were different after exposure to different doses of UV (λmot 254 nm) irradiation; Anabaena sp. was more resistant to higher UV dose than A. doliolum. In both species the UV induced damage was partially repaired by white fluorescent light. A. doliolum showed a lower rate of photorecovery than Anabaena sp., Higher UV dose (20 min) induced production of a non‐nitrogen fixing strain of A. doliolum and a pigment mutant lacking phycoerythrin of Anabaena sp.
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