Studies with cation specific ionophores show that within the intact chloroplast Mg++ acts as the main exchange cation for H+ pumping.
D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001693:Biological Transport, Active; D002118:Calcium / Q000494:pharmacology; D002264:Carboxylic Acids / Q000494:pharmacology*; D002734:Chlorophyll / Q000032:analysis; D002736:Chloroplasts / Q000187:drug effects / Q000378:metabolism*; D004237:Diuron / Q000494:pharmacology; D006835:Hydrazones / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D008274:Magnesium / Q000378:metabolism / Q000494:pharmacology*; D009570:Nitriles / Q000494:pharmacology; D010944:Plants; D014634:Valinomycin / Q000494:pharmacology
D000900:Anti-Bacterial Agents; D002264:Carboxylic Acids; D006835:Hydrazones; D009570:Nitriles; D002734:Chlorophyll; D014634:Valinomycin; D004237:Diuron; D008274:Magnesium; D002118:Calcium