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- W2593676060 abstract "Chloroplasts in vivo exposed to strong light export assimilates and excess reducing power to the cytoplasm for metabolic conversions and allocation to neighboring and distant organelles. The cytoplasmic streaming, being particularly fast in characean internodes, distributes the exported metabolites from brightly illuminated cell spots to light-limited regions, which is evident from the transient increase in chlorophyll fluorescence of shaded areas in response to illumination of distant cell regions situated upstream the liquid flow. It is not yet known whether long-distance communications between anchored chloroplasts are interfered by pH banding that commonly arises in characean internodes under the action of continuous or fluctuating light. In this study, microfluorometry, pH-microsensors, and local illumination were combined to examine long-distance transport and subsequent reentry of photosynthetic metabolites, including triose phosphates, into chloroplasts of cell regions producing external alkaline and acid bands. The lateral transmission of metabolic signals between distant chloroplasts was found to operate effectively in cell areas underlying acid zones but was almost fully blocked under alkaline zones. The rates of linear electron flow in chloroplasts of these regions were nearly equal under dim background light, but differed substantially at high light when availability of CO2, rather than irradiance, was the rate-limiting factor. Different productions of assimilates by chloroplasts underlying CO2-sufficient acid and CO2-deficient alkaline zones were a cause for contrasting manifestations of long-distance transport of photosynthetic metabolites. Nonuniform cytoplasmic pH in cells exhibiting pH bands might contribute to different activities of metabolic translocators under high and low pH zones." @default.
- W2593676060 created "2017-03-16" @default.
- W2593676060 creator A5061124726 @default.
- W2593676060 creator A5066267431 @default.
- W2593676060 date "2017-05-01" @default.
- W2593676060 modified "2023-09-26" @default.
- W2593676060 title "Photoregulation of photosystem II activity mediated by cytoplasmic streaming in Chara and its relation to pH bands" @default.
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- W2593676060 doi "https://doi.org/10.1016/j.bbabio.2017.02.014" @default.
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