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- W2148636700 abstract "The metallochromic indicator Eriochrome Blue SE was used to measure light-induced internal movement of Mg2+ in intact chloroplasts. By dual-wave-length spectroscopy (measuring wavelength 554 nm, reference 592 nm) a light-induced, dark-reversible absorbance increase of Eriochrome Blue in samples of isolated intact chloroplasts was observed. The light/dark difference spectrum of Eriochrome Blue between 550 and 590 nm (reference wavelength 562 nm) indicated that this absorbance increase was caused by an increased concentration of free Mg2+ in a neutral or slightly alkaline chloroplast compartment. The signal was seen only with intact, but not with broken, envelope-free chloroplasts, which had lost most of their divalent cations. This is interpreted to show that the indicator responds to an increase of Mg2+ concentration in the chloroplast stroma, which represents an efflux of Mg2+ from the intra-thylakoid space caused by light-dependent proton pumping. As calculated from corrected values of the absorbance increase of Eriochrome Blue, the light-induced internal release of Mg2+ was close to 100 nequiv per mg chlorophyll at pH 7.6 and 250 nequiv at pH 7.1. This corresponds to a light-dependent increase in the concentration of free Mg2+ in the stroma of about 2 and 5 mM, respectively." @default.
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- W2148636700 date "1977-06-01" @default.
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- W2148636700 title "Light-induced movement of magnesium ions in intact chloroplasts. Spectroscopic determination with Eriochrome Blue SE" @default.
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- W2148636700 doi "https://doi.org/10.1016/0005-2728(77)90088-3" @default.
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