title: [Early effect of sodium pentachlorophenate on photosynthetic activity of the alga Chlorella pyrenoidosa Chick S-39].
abstract: Early effects of 0.0001-10 mM sodium pentachlorophenate (PCP-Na) on the green alga Chlorella pyrenoidosa Chick. S-39 involves a rapid (within 1-2 min) decrease in the light-induced oxygen evolution by algal cells. The suppressed relative yield of variable chlorophyll fluorescence in C. pyrenoidosa in the presence of high PCP-Na concentrations and its dynamics provide evidence for rapid inactivation of photosystem 2, which is not observed at low concentrations of the toxicant. An analysis of the induction curve of delayed chlorophyll fluorescence in algal cells suggests that PCP-Na at low concentrations disturbs the coupling of electron transport and phosphorylation, whereas at high concentrations it inhibits electron transport and decreases the energy potential of photosynthetic membranes. The early toxic effect of PCP-Na is responsible for subsequent impairment of C. pyrenoidosa productivity.
authors.forename: S E
authors.initials: SE
authors.lastname: Plekhanov
authors.forename: Iu K
authors.initials: IuK
authors.lastname: Chemeris
mesh_terms: D002708:Chlorella / Q000166:cytology / Q000378:metabolism*; D002734:Chlorophyll / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D004579:Electron Transport / Q000187:drug effects; D010100:Oxygen / Q000378:metabolism; D010416:Pentachlorophenol; D010766:Phosphorylation / Q000187:drug effects; D045332:Photosystem II Protein Complex / Q000378:metabolism*; D013997:Time Factors; D014475:Uncoupling Agents
chemical_list: D045332:Photosystem II Protein Complex; D014475:Uncoupling Agents; D002734:Chlorophyll; D010416:Pentachlorophenol; D010100:Oxygen