Abstract
The major theme of my work in photosynthesis has been electron transport in green plant thylakoids. In particular, we investigated the properties and the role of the NADP-reducing flavoprotein and its possible function in cyclic electron transport, the regulation by protons of electron transport, and the redox system of ascorbate and monodehydroascorbate (the ascorbate free radical). The function of this system in providing ATP in the stoichiometric amount needed for carbon assimilation, and the regulation of the alternative transfer of electrons to NADP and to the ascorbate free radical were among the achievements of my collaborators and myself. Specifically, the early conviction that cyclic phosphorylation was essential part in photosynthesis was shattered as far as higher plants are concerned, and replaced by a modified Mehler reaction providing additional ATP to run the Calvin cycle. The situation seems to be different in unicellular green algae, where quantitatively much l arger changes of the relative size of Photosystem (PS) I and PS II antennae during the so-called ‘state’ transitions have been reported, and these seem to be associated with a high activity of cyclic electron transport in state 2. Beyond the science, the friendly interactions with so many persons around the world sharing my interest in photosynthesis and in other aspects of human life have been most rewarding.
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