title: UVB-induced reduction in biomass and overall productivity of cyanobacteria.
abstract: Effect of middle wave ultraviolet radiation (UVB) was studied in three different species of cyanobacteria (Nostoc, Anabaena and Scytonema) by estimating their growth pattern, biomass yield, chlorophyll content, total starch and protein content. The results show that exposure of the cyanobacteria with UVB dose corresponding to an increase or decrease of 20% in its environmental flux will have drastic effects on biomass production, photosynthetic rate and nitrogen fixation. Cyanobacteria are primary sources of marine food web and an important biofertilizer; therefore, their protection from increasing threat of stratospheric ozone depletion will be necessary to maintain the ecological balance.
authors.affiliation: Photobiology Laboratory, Industrial Toxicology Research Centre, Lucknow, India.
authors.forename: G S
authors.initials: GS
authors.lastname: Babu
authors.forename: P C
authors.initials: PC
authors.lastname: Joshi
authors.forename: P N
authors.initials: PN
authors.lastname: Viswanathan
mesh_terms: D017033:Anabaena / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects; D001426:Bacterial Proteins / Q000378:metabolism / Q000528:radiation effects; D018533:Biomass; D002734:Chlorophyll / Q000378:metabolism / Q000528:radiation effects; D000458:Cyanobacteria / Q000254:growth & development* / Q000378:metabolism / Q000528:radiation effects*; D004307:Dose-Response Relationship, Radiation; D013213:Starch / Q000378:metabolism / Q000528:radiation effects; D014466:Ultraviolet Rays / Q000009:adverse effects*
chemical_list: D001426:Bacterial Proteins; D002734:Chlorophyll; D013213:Starch