Abstract
When a green leaf is exposed to the light after short period of dark adaptation, then there are some nonmonotonous changes of chlorophyll fluorescence. These changes reflect a number of regulatory processes in the photosynthetic apparatus accompanying its dark-to-light transition and intended for attainment of the maximal rate of photosynthesis. They are known as a slow fluorescence induction (SFI) [1]. Earlier, we have shown that in some experimental conditions there is a high positive correlation between the relative quenching of fluorescence in course of SFI, on the one hand, and the stationary photosynthetic activity, on the other hand [2–4]. In this work, we give three new proofs of this correlation for plants treated with various chemical agents and infected with pathogens.
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