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={B. Demmig and H. Gimmler},
  journal={Zeitschrift f{\"u}r Naturforschung C},
  year={1979},
  volume={34},
  pages={233 - 241}
}
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… Expand
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. Expand
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. Expand
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. Expand
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. Expand
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. Expand
The effects of chloroplast envelope-Mg2+, cation movement, and osmotic stress on photosynthesis
TLDR
Results indicated that the degree of osmotic stress inhibition of photosynthesis was dependent on chloroplast envelope-bound Mg2+, and cation fluxes may be associated with an H+ efflux ATPase pump on the chlorOPlast envelope, and that maintenance of optimal photosynthesis in the osmotically stressed chloroplasts may beassociated with maintenance of high stromal pH. Expand
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. Expand
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. Expand
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. Expand
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. Expand
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References

SHOWING 1-10 OF 25 REFERENCES
Plant Physiol
  • 62, 326
  • 1978
A
  • R. Portis jr., H. W. Heldt, and U. Heber, Biochim. Biophys. Acta 501, 488
  • 1978
Biochim
  • Biophys. Acta 502, 232
  • 1978
Biochim
  • Biophys. Acta 460, 500
  • 1977
Biochim
  • Biophys. Acta 461, 510
  • 1977
Biochim
  • Biophys. Acta 449, 434
  • 1976
The Intact chloroplast
Vllnth
  • Internat. Congr. Photobiology, Rom, Book of Abstracts, p. 64
  • 1976
Anal
  • Biochem. 55, 497
  • 1975
Arch
  • Biochem. Biophys. 170, 576
  • 1975
...
1
2
3
...