Impact of Ultraviolet-B Radiation on Cyanobactrial Isolates

• Published in: Research journal of pharmacy and technology 2017-02, Vol.10 (2), p.461-466
• Main Authors: Suresh, Arumuganainar, Gowrisankar
• Format: Article
• Language: English
• Subjects: Adaptation; Carotenoids; Cyanobacteria; Ecosystems; Growth rate; Light; Pigments; Studies; Ultraviolet radiation
• ISSN: 0974-3618; 0974-360X; 0974-306X
• DOI: 10.5958/0974-360X.2017.00093.2

Enhanced solar ultraviolet radiation due to ozone depletion is a major stress factor for cyanobacteria in aquatic and terrestrial ecosystems. [...]to study the impact of UV-B radiation on cyanobacteria, we isolated three genus of blue green algae namely Anabaena spp., Nostoc spp., and Scytonema spp., and were exposed to UV-B at sublethal dose. [...]cyanobacteria have been found to poses mechanisms to avoid UV-B rays and defend against them.3 Such as ROS4, DNA damage, specific proteins3, and organisms affected by UV-B exposure have thus been shown to grow more slowly and replicate less frequently.5'6 Moreover, closely related species of cyanobacteria show a large degree of variability in their sensitivity to UV light. In the case of Scytonema sp., the heterocyst was stout and lucid in UV exposed whereas in wild strain heterocyst was slim and shrinked in shape (Figure 2). [...]the heterocyst number (Figure 3) was increased (10%) in UV-B exposed Scytonema sp than the wild but in other culture the count was reduced. [...]cell counts were also revealed the high in UV-B treated than the wild strain.