title: Differential physiological and biochemical responses of two cyanobacteria Nostoc muscorum and Phormidium foveolarum against oxyfluorfen and UV-B radiation.
abstract: In the present study, degree of tolerance and tolerance strategies of two paddy field cyanobacteria viz. Nostoc muscorum and Phormidium foveolarum against oxyfluorfen (10 and 20 μg ml(-1)) and UV-B (7.2 kJ m(-2)d(-1)) stress were investigated. Oxyfluorfen and UV-B decreased growth, photosynthesis, nutrient uptake, nitrate reductase, acid and alkaline phosphatase activities, which accompanied with the increase in the level of oxidative stress. However, growth was more affected in N. muscorum than P. foveolarum. Antioxidants exhibited differential responses against oxyfluorfen and UV-B stress. Ascorbate and proline levels were higher in P. foveolarum. A protein of 66 kDa was expressed in N. muscorum, however, it was absent in P. foveolarum than those of N. muscorum. Besides this, a protein of 29 kDa appeared in P. foveolarum under all the treatments, but it was present only in control cells of N. muscorum cells. Overall results indicated resistant nature of P. foveolarum against oxyfluorfen and UV-B stress in comparison to N. muscorum.
authors.affiliation: Ranjan Plant Physiology and Biochemistry Laboratory, Department of Botany, University of Allahabad (A Central University of India), Allahabad (UP) 211002, India.
authors.lastname: Sheeba
authors.forename: Vijay
authors.initials: V
authors.lastname: Pratap Singh
authors.forename: Prabhat
authors.initials: P
authors.lastname: Kumar Srivastava
authors.forename: Sheo
authors.initials: S
authors.lastname: Mohan Prasad
mesh_terms: D000135:Acid Phosphatase / Q000378:metabolism; D000469:Alkaline Phosphatase / Q000378:metabolism; D000975:Antioxidants / Q000378:metabolism; D001205:Ascorbic Acid / Q000378:metabolism; D018533:Biomass; D000458:Cyanobacteria / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology / Q000528:radiation effects*; D055768:Halogenated Diphenyl Ethers / Q000494:pharmacology*; D050901:Nitrate Reductase / Q000378:metabolism; D050502:Nostoc muscorum / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology / Q000528:radiation effects*; D018384:Oxidative Stress; D010788:Photosynthesis; D011392:Proline / Q000378:metabolism; D014466:Ultraviolet Rays
chemical_list: D000975:Antioxidants; D055768:Halogenated Diphenyl Ethers; C016027:oxyfluorofen; D011392:Proline; D050901:Nitrate Reductase; D000469:Alkaline Phosphatase; D000135:Acid Phosphatase; D001205:Ascorbic Acid