title: Impact of nitrophenols on the photosynthetic electron transport chain and ATP content in Nostoc muscorum and Chlorella vulgaris.
abstract: Concentration-dependent inhibition of the photosynthetic electron transport chain (photosystem I (PS I), photosystem II (PS II) and whole chain reaction) and ATP content was observed in Nostoc muscorum and Chlorella vulgaris grown with o-nitrophenol, m-nitrophenol, or 2,4-dinitrophenol. Although the extents of inhibition of the photosynthetic electron transport chain in both organisms were similar, PS II was more sensitive than PS I and whole chain reaction to the nitrophenols. Depletion of the ATP pool was noted in nitrophenol-grown cultures, probably as a consequence of nearly complete inhibition of the photosynthetic electron transport chain.
authors.affiliation: Department of Microbiology, Sri Krishnadevaraya University, Anantapur 515003, India.
authors.forename: A
authors.initials: A
authors.lastname: Umamaheswari
authors.forename: K
authors.initials: K
authors.lastname: Venkateswarlu
mesh_terms: D019297:2,4-Dinitrophenol / Q000633:toxicity*; D000255:Adenosine Triphosphate / Q000032:analysis / Q000378:metabolism; D001673:Biodegradation, Environmental; D002708:Chlorella / Q000187:drug effects* / Q000201:enzymology; D003470:Culture Media / Q000032:analysis; D000458:Cyanobacteria / Q000187:drug effects* / Q000201:enzymology; D004579:Electron Transport / Q000187:drug effects; D009596:Nitrophenols / Q000633:toxicity*; D010788:Photosynthesis / Q000187:drug effects*; D045331:Photosystem I Protein Complex / Q000037:antagonists & inhibitors*; D045332:Photosystem II Protein Complex / Q000037:antagonists & inhibitors*; D014475:Uncoupling Agents / Q000633:toxicity*
chemical_list: D003470:Culture Media; D009596:Nitrophenols; D045331:Photosystem I Protein Complex; D045332:Photosystem II Protein Complex; D014475:Uncoupling Agents; D000255:Adenosine Triphosphate; C045573:2-nitrophenol; D019297:2,4-Dinitrophenol; C049017:3-nitrophenol