Effect of Divalent Cations on Cation Fluxes Across the Chloroplast Envelope and on Photosynthesis of Intact Chloroplasts

@article{Demmig1979EffectOD,
  title={Effect of Divalent Cations on Cation Fluxes Across the Chloroplast Envelope and on Photosynthesis of Intact Chloroplasts},
  author={Barbara Demmig and Hartmut Gimmler},
  journal={Zeitschrift f{\"u}r Naturforschung C},
  year={1979},
  volume={34},
  pages={233 - 241}
}
  • B. Demmig, H. Gimmler
  • Published 1 April 1979
  • Environmental Science
  • Zeitschrift für Naturforschung C
Abstract The effect of divalent cations on cation fluxes across the chloroplast envelope and on photo synthetic reactions of intact spinach chloroplasts was investigated. In the absence of EDTA, divalent cations inhibited photosynthetic CO2-fixation and PGA-reduction at low PGA concentrations, but had almost no effect on the reduction of OAA, BQ, and on PGA-reduction at high PGA concentrations. The inhibitory effect of Ca2+ was greater than that of Mg2+. Inhibition of photosynthesis was greater… 
The role of monovalent cations for photosynthesis of isolated intact chloroplasts
TLDR
The role of monovalent cations in the photosynthesis of isolated intact spinach chloroplasts was investigated and a light-triggered K+/H+ exchange at the chloroplast envelope is discussed with regard to the light-induced increase in the pH and the Mg2+ concentration in the stroma, which are thought to be obligatory for light activated Calvincycle enzymes.
Characterization of calcium fluxes across the envelope of intact spinach chloroplasts
TLDR
The action spectrum of light-induced Ca2+ influx and the inhibitory effect of 3-(3',4'-dichlorophenyl)-1,1-dimethylurea (DCMU) indicate an involement of photosynthetic electron transport in this process, which is likely a change in the membrane potential component of the proton motive force.
Permeability Properties of the Chloroplast Envelope for Monovalent Inorganic Cations and their Distribution Between the Intact Chloroplast and the External Medium in the Light and Dark
TLDR
Evidence is presented that K is not transported in a primary active process but that light-induced cation uptake into isolated intact chloroplasts is driven by an electrical potential gradient, which might be one reason for the variation in CO2-fixation activity and stability which is being observed with isolated chloroplast.
Regulation of Photosynthetic Electron Transport in Intact Spinach Chloroplasts: I. INFLUENCE OF EXOGENOUS SALTS ON OXALOACETATE REDUCTION.
TLDR
The results suggest that the ion content of the medium (or cytosol) is potentially important in modulating photosynthetic electron transport events in intact chloroplasts.
Surface Charge-Mediated Effects of Mg on K Flux across the Chloroplast Envelope Are Associated with Regulation of Stromal pH and Photosynthesis.
TLDR
It was concluded that Mg(2+) effects on photosynthesis were likely not mediated by this effect on membrane potential, and data presented were consistent with the previously developed hypothesis that millimolar levels of external, unchelated Mg (2+) result in lowerStromal K(+), which somehow is linked to stromal acidification.
Properties of the Isolated Intact Chloroplast at Cytoplasmic K Concentrations : I. Light-Induced Cation Uptake into Intact Chloroplasts is Driven by an Electrical Potential Difference.
TLDR
The results demonstrate a requirement of high external concentrations of monovalent cations for CO(2) fixation in intact chloroplasts.
Effects of Magnesium on Intact Chloroplasts : II. CATION SPECIFICITY AND INVOLVEMENT OF THE ENVELOPE ATPase IN (SODIUM) POTASSIUM/PROTON EXCHANGE ACROSS THE ENVELOPE.
TLDR
Results suggested that H(+) fluxes across the chloroplast envelope are regulated by two mechanisms: (a) an active, oligomycin-sensitive H(+)/K(+) efflux and (b) a reversible, Mg(2+)-dependent, oligomecin-insensitive H( +)/K (+) exchange.
Studies on the System Regulating Proton Movement across the Chloroplast Envelope : Effects of ATPase Inhibitors, Mg, and an Amine Anesthetic on Stromal pH and Photosynthesis.
TLDR
2-(diethylamino)-N-(2,6-dimethylphenyl)acetamide is an amine anesthetic that is known to act as a monovalent cation channel blocker in mammalian systems and was found to raise stromal pH and stimulate photosynthesis in chloroplasts that had high envelope Mg(2+) and inhibited envelope ATPase activity.
Effects of pH and other factors on the phosphate dependence of photosynthesis in spinach chloroplasts
TLDR
It is postulated that at low stromal pH, larger metabolic pools are required to maintain maximum rates of photosynthesis because of changes in substrate affinity of some Calvin-cycle enzymes, Consequently, chloroplast photosynthesis would be more sensitive to exogenous Pi.
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References

SHOWING 1-10 OF 23 REFERENCES
Plant Physiol
  • 62, 326
  • 1978
Arch
  • Biochem. Biophys. 145,622
  • 1971
A
  • R. Portis jr., H. W. Heldt, and U. Heber, Biochim. Biophys. Acta 501, 488
  • 1978
25 b
  • 718
  • 1970
Plant Physiol
  • 45, 25
  • 1970
Biochim
  • Biophys. Acta 3%, 276
  • 1975
Biochim
  • Biophys. Acta 460, 500
  • 1977
Biochim
  • Biophys. Acta 502, 232
  • 1978
Arch
  • Biochem. Biophys. 170, 576
  • 1975
...
...