Effects of controlled oxidative stress and uncouplers on primary photosynthetic processes in vegetative cells of Antarctic alga Zygnema sp.

In our study, we present responses of Antarctic strain of filamentous alga Zygnema sp. collected at James Ross Island (Antarctica) to application of variuos uncouplers of pri-mary photosynthetic processes. We exposed the alga to different concentrations of nigericin, 3-(3,4-dichlorophenyl)-1,1-dimet...

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Bibliographic Details
Main Authors: Kakkou, Christos, Barták, Miloš, Hájek, Josef, Skácelová, Kateřina, Hazdrová, Jana
Format: Article in Journal/Newspaper
Language:English
Published: Masaryk Univerzity 2016
Subjects:
chlorophyll fluorescence
PS II
alga
fillamentous
photosynthesis blockers
Antarctic
Ross Island
Antarc*
Antarctica
James Ross Island
Online Access:http://journals.muni.cz/CPR/article/view/12890
Description
Summary:In our study, we present responses of Antarctic strain of filamentous alga Zygnema sp. collected at James Ross Island (Antarctica) to application of variuos uncouplers of pri-mary photosynthetic processes. We exposed the alga to different concentrations of nigericin, 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU), dithiothreitol (DTT), methyl viologen (MV) and hydrogen peroxide (H2O2) in order to test stability of photosystem II, involvement of non-photochemical quenching, and PS II functioning under combination of moderate light with particular uncoupler. Oxidative stress tolerance was tested by the combination of hydrogen peroxide (H2O2) and moderate light. Time courses of FV/FM, FPSII, NPQ and qF0 were investigated and particular effects of the above-specified chem-icals discussed. Moderate doses of uncouplers allowing partial recovery, and the doses causing full inhibition of PS II were specified.

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