The effect of salt concentration on the fluorescence parameters of isolated chloroplasts

The previously reported effect of salt concentration on the fluorescence and other photochemical activities of Photosystem II is interpreted in terms of a change in the radiationless transition and the trapping probabilities. This is confirmed by quantitative comparison of the fluorescence and the photochemical activity. As a by-product of this analysis a method is devised to estimate the background fluorescence.

We did not eliminate the possibility that the radiationless transition constant may include a contribution of energy transfer from Photosystem II to Photosystem I.