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Research Journal of Pharmacy and Technology
Year : 2017, Volume : 10, Issue : 2
First page : ( 461) Last page : ( 466)
Print ISSN : 0974-3618. Online ISSN : 0974-360X.
Article DOI : 10.5958/0974-360X.2017.00093.2

Impact of Ultraviolet-B Radiation on Cyanobactrial Isolates

Suresh Arumuganainar1,2,*, Gowrisankar2,3

1Department of Biotechnology, School of Life Sciences, Vels Institute of Science Technology and Advanced Studies, Pallavaram, Chennai-600117, Tamil Nadu, India

2Department of Microbiology, Sri Paramakalyani College, Alwarkurichi, Tamilnadu, 627412, India

3Division of Bacterial Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, 30333, USA

*Corresponding Author E-mail: blueyellowsnu@gmail.com

Online published on 29 April, 2017.

Abstract

Enhanced solar ultraviolet radiation due to ozone depletion is a major stress factor for cyanobacteria in aquatic and terrestrial ecosystems. Therefore 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. The UV exposed cyanobacteria were screened analyzed for the specific growth rate, pigments and heterocyst count with wild type strains for a period of 20 days. All UV-B exposed strains were exhibited stunted growth and pigments content except Scytonema spp. It exhibited accelerated growth and increased carotenoids and heterocyst number. This investigation concluded that the UV-B radiation has negative impact on all genus studied except Scytonema spp in which strain improved in many aspects (positive impact). There by high efficiency strains can be generated using UV-B mutation that could potentiate their application as biofertilizer and also for value added products.

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Keywords

Cyanobacteria, Ultraviolet radiation, Stress, Chlorophyll, Carotenoids, Heterocyst.

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