Early effect of sodium pentachlorophenate on photosynthetic activity of the alga Chlorella pyrenoidosa Chick S-39

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 i...

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Bibliographic Details
Published inIzvestiia Akademii nauk. Seriia biologicheskaia no. 3; p. 288
Main Authors Plekhanov, S E, Chemeris, Iu K
Format Journal Article
LanguageRussian
Published Russia (Federation) 01.05.2008
Subjects
Chlorella - cytology
Chlorella - metabolism
Chlorophyll - metabolism
Dose-Response Relationship, Drug
Electron Transport - drug effects
Oxygen - metabolism
Pentachlorophenol
Phosphorylation - drug effects
Photosystem II Protein Complex - metabolism
Time Factors
Uncoupling Agents
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Summary: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.
ISSN:1026-3470