On the coupling of electrical events at the membranes of energized chloroplasts in intact plant leaf cells

Estimation of the light‐induced electrical potential at the functional membrane of photosynthesis using a voltage‐dependent ionophore

“…However, at the moment no results from other methods are available. Measurements with microcapillary glass electrodes inserted in a single grana stack indicate a single turn-,over potential of about 10 mV [44,45] *, However, these results cannot be considered because the hole which is produced by the insertion (radius -0.5 pm, i.e. a hole of the size of about a whole thylakoid) must falsify the true potential considerably.…”

“…a hole of the size of about a whole thylakoid) must falsify the true potential considerably. This is indicated already by the decay time which is 10 times faster (-10 ms) [45] than without electrodes (-100 ms) [ 1 ] . Light-induced potentials calculated from measurements of delayed light emission [46] were not carried out at single turnover conditions and can therefore also not be used for a comparison.…”