Russian Journal of Plant Physiology

, Volume 59, Issue 1, pp 35–41 | Cite as

Effect of cytoplasmic streaming on photosynthetic activity of chloroplasts in internodes of Chara corallina

Research Papers


Cytoplasmic streaming plays an important role in cell processes since it promotes solute exchange between the cytoplasm and organelles and enables lateral transport for extensive distances. The role of cyclosis in chloroplast functioning should be most conspicuous under conditions mimicking natural mosaic illumination and consequent alternation of cell regions with dominant dark and photosynthetic metabolism. Based on this assumption, we examined the light response curves and the induction kinetics of fluorescence-based parameters of chloroplast photosynthetic activity on small regions (d ∼ 100 μm) of Chara corallina Klein ex Willd. internodal cells exposed to local and overall illumination under conditions of normal cytoplasmic streaming and after suppression of cyclosis by cytochalasin B, an inhibitor of actin microfilaments. Under control conditions, the whole cell illumination caused non-photochemical quenching (NPQ) of chlorophyll fluorescence, which approached the saturation at a photon flux density of about 40 μmol/(m2 s). By contrast, illumination of a small (2 mm wide) cell part did not cause significant NPQ at light intensities up to 100 μmol/(m2 s), indicating that the chloroplast photosynthetic activity was substantially higher under conditions of localized illumination. After the inhibition of cyclosis by cytochalasin B, the light response curves were represented by nearly identical sigmoid curves, irrespective of the illumination pattern. When the cyclosis was restored in the cells washed from the inhibitor, the light response curves measured under overall and localized illumination returned to their original divergent shapes. These and other data indicate that different photosynthetic activities of chloroplasts in cells exposed to entire and partial illumination are directly related to the flow of compositionally nonuniform cytoplasm between the cell parts with prevalent photosynthetic and respiratory metabolism.


Chara corallina cytoplasmic streaming photosynthesis nonuniform illumination chloroplasts chlorophyll fluorescence non-photochemical quenching cytochalasin B action potential 



quantum yield of photosystem II photochemical reaction


non-photochemical quenching


photosynthetically active radiation


photosystem II


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© Pleiades Publishing, Ltd. 2012

Authors and Affiliations

  1. 1.Department of Biophysics, Faculty of BiologyMoscow State UniversityMoscowRussia

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