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      On the evolution of the concept of two light reactions and two photosystems for oxygenic photosynthesis: A personal perspective

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          Abstract

          I present here a personal perspective of the evolution of the two-light reaction two-pigment scheme for the electron transport in oxygenic photosynthesis – as I have lived through it – first as a graduate student of Robert Emerson, from September 1956–January 1959, and then of Eugene Rabinowitch from February 1959–September 1960. I have provided here some of the key published work in my way and have also provided a few photographs. It is essential to remind ourselves upfront that different individuals may have different recollections of the same event ( see e.g., the Japanese movie ‘Rashomon’ https://en.wikipedia.org/wiki/Rashomon). Thus, I encourage others to write about their perspective. Further, I recognize, upfront, the support and encouragement I have received from Robert Blankenship for writing this perspective, and from Győző Garab for submission of this story to Photosynthetica. I begin my perspective with a dedication to Robert Emerson, whose pioneering work led to the concept of the two-light reaction two-pigment system in oxygenic photosynthesis.

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          Function of the Two Cytochrome Components in Chloroplasts: A Working Hypothesis

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            THE PHOTOCHEMICAL REACTION IN PHOTOSYNTHESIS

            Measurements of photosynthesis were made in continuous and flashing light of high intensity, using cells varying in chlorophyll content. The amount of chlorophyll present per molecule of carbon dioxide reduced per single flash of light was found to be about 2480 molecules. The length of time required for one unit in the photosynthetic mechanism to complete the cycle of photochemical and Blackman reactions was found to be about 0.02 sec. at 25°C. The equation R = AIN was shown to give a good description of the rate of the photochemical reaction, when A is a velocity constant, I the intensity of light, and N the number of units in the photosynthetic mechanism.
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              SOME FACTORS INFLUENCING THE LONG-WAVE LIMIT OF PHOTOSYNTHESIS.

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                Author and article information

                Journal
                Photosynthetica
                Photosynthetica
                PHOTOSYNTHETICA
                Photosynthetica
                Institute of Experimental Botany, Academy of Sciences of the Czech Republic
                0300-3604
                1573-9058
                2023
                16 February 2023
                : 61
                : 1
                : 37-47
                Affiliations
                [1]Department of Plant Biology, Department of Biochemistry, and Center of Biophysics and Quantitative Biology, University of Illinois at Urbana-Champaign, Urbana, 61801 Illinois, USA
                Author notes
                [* ]Corresponding author: gov@ 123456illinois.edu
                Author information
                https://orcid.org/0000-0003-3774-0638
                Article
                PS61037
                10.32615/ps.2023.006
                11515826
                39650120
                3349815a-0bd6-4903-ad14-1cebd11debe6
                Copyright: © 2023 Govindjee.

                This is an open access article distributed under the terms of the Creative Commons BY-NC-ND Licence.

                History
                : 04 January 2023
                : 16 January 2023
                Categories
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                bessel kok,cytochromes,emerson enhancement effect,louis n.m. duysens,p700,red drop in photosynthesis,robert (robin) hill,z-scheme

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