Abstract
The development and organization of the Photosynthetic units follow a step-wise assembly process. First the core complexes of the PSI and PSII units are formed, followed by their light-harvesting components; then an assembly process of these components into supramolecular structures takes place. Parallel to this, the control of excitation energy distribution between the two photosystems is established. This control is attributed to the modulation of the PSI unit effective cross section, which is possible only when LHC-I is formed and assembled into CPIa. Parallel to the formation of PSI and PSII, the electron carriers are synthesized and the electron transport chain is assembled. The number of PSII units operating per electron transport chain remains constant throughout development and equal to that of the mature chloroplast, but the number of PSI units per chain varies with PSII unit size. During development, when the rate of Chla synthesis is low, relative to the other thylakoid components, or is completely stopped, then the newly formed or preexisting LHC-I and LHC-II proteins are digested and their Chla is used for the formation of PS core complexes.
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Akoyunoglou, G., Argyroudi-Akoyunoglou, J.H. Organization of the photosynthetic units, and onset of electron transport and excitation energy distribution in greening leaves. Photosynth Res 10, 171–180 (1986). https://doi.org/10.1007/BF00118280
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DOI: https://doi.org/10.1007/BF00118280