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International Journal on Algae

Publicado 4 números por año

ISSN Imprimir: 1521-9429

ISSN En Línea: 1940-4328

SJR: 0.168 SNIP: 0.377 CiteScore™:: 0.6 H-Index: 11

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

Volumen 7, Edición 3, 2005, pp. 213-227
DOI: 10.1615/InterJAlgae.v7.i3.20
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SINOPSIS

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.

CITADO POR
  1. Mykhaylenko Natalia F., Zolotareva Elena K., The Effect of Copper and Selenium Nanocarboxylates on Biomass Accumulation and Photosynthetic Energy Transduction Efficiency of the Green Algae Chlorella Vulgaris, Nanoscale Research Letters, 12, 1, 2017. Crossref

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