[Effect of oxidative stress inductors on the photosynthetic apparatus in cyanobacterium Synechocystis sp. PCC 6803 Prq20 mutant resistant to methyl viologen].
The damaging effect of oxidative stress inductors: methyl viologen, benzyl viologen, cumene hydroperoxide, H2O2, menadion, and high irradiance on the photosynthetic apparatus of cyanobacterium Synechocystis sp. PCC 6803 in cells of the wild type strain and the methyl viologen-resistant Prq20 mutant with the disrupted function of the regulatory gene prqR has been investigated by measuring the delayed fluorescence of chlorophyll a and the rate of CO2dependent -O2 gas exchange. It has been shown that the damage to the photosynthetic apparatus in the Prq20 mutant as compared with the wild type was less in the presence of methyl viologen and benzyl viologen. Reasons for the enhanced resistance of the photosynthetic apparatus in the mutant Prq20 to methyl viologen and benzyl viologen are discussed.
Kreslavskiĭ
V D
VD
Fomina
I R
IR
Kosobriukhov
A A
AA
Herbert
S K
SK
Babykin
M M
MM
Biel
K Y
KY
D001426:Bacterial Proteins / Q000235:genetics; D001594:Benzyl Viologen / Q000378:metabolism / Q000494:pharmacology; D004351:Drug Resistance / Q000235:genetics*; D006540:Herbicides / Q000494:pharmacology; D009154:Mutation; D016877:Oxidants / Q000378:metabolism / Q000494:pharmacology*; D018384:Oxidative Stress; D010269:Paraquat / Q000494:pharmacology; D045322:Photosynthetic Reaction Center Complex Proteins / Q000187:drug effects*; D012097:Repressor Proteins / Q000235:genetics; D046939:Synechocystis / Q000187:drug effects* / Q000235:genetics
D001426:Bacterial Proteins; D006540:Herbicides; D016877:Oxidants; D045322:Photosynthetic Reaction Center Complex Proteins; D012097:Repressor Proteins; D001594:Benzyl Viologen; D010269:Paraquat