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International Journal on Algae
SJR: 0.219 SNIP: 0.261 CiteScore™: 0.24

ISSN Druckformat: 1521-9429
ISSN Online: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v7.i3.20
pages 213-227

The modes of glucose action on photosynthesis of Spirulina platensis (Nordst.) Geitl. (Cyanophyta) as revealed by chlorophyll fluorescence analysis

N. F. Mykhaylenko
N.G. Kholodny Institute of Botany, National Academy of Sciences of Ukraine, 2, Tereschenkovskaya St., 01001 Kiev, Ukraine

ABSTRAKT

The effects of a) glucose, b) mannose and 2-deoxyglucose (glucose analogues capable of triggering hexokinase-mediated photosynthesis repression) and c) sodium citrate on chlorophyll fluorescence parameters of the blue-green alga Spirulina platensis (Nordst.) Geitl. were investigated. The addition of glucose evoked, at first, the lowering of all photochemical fluorescence quenching parameters (FV/FM, FV'/FM', qP and ΦPS II). The decrease correlated with glucose concentration. The inhibition of photochemical activity relaxed after the third day of the experiment, perhaps, as the consequence of glucose utilization. If the concentration of glucose in the cultural medium was high enough (50 mM), on the seventh day all the indices of photochemical quenching began to diminish again, at which time qP reduction was more significant than that for FV'/FM'. The relief of glucose repressive effects was light-dependent. Glucose analogues caused the decrease in only one photochemical quenching parameter, qP. Unlike mannose, the effect of 2-deoxyglucose was more pronounced and did not weaken till the end of experiments. Nonphotochemical quenching fluorescence parameters (qN and NPQ) were also reduced under monosaccharide treatment. The influence of sodium citrate on chlorophyll fluorescence parameters was negligible. Therefore, the multiplicity of glucose effects in the course of inhibition of S. platensis photosystem II activity was demonstrated, while hexokinase-dependent repression mechanism was playing only a partial role and resulting in the blocking of electron flow from photosystem II reaction centers down the electron transport chain.


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