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- W2066330181 abstract "The structural and functional organization of the spinach chloroplast photosystems (PS) I, IIα and IIβ was investigated. Sensitive absorbance difference spectrophotometry in the ultraviolet (▵A320) and red (▵A700) regions of the spectrum provided information on the relative concentration of PS II and PS I reaction centers. The kinetic analysis of PS II and PS I photochemistry under continuous weak excitation provided information on the number (N) of chlorophyll (Chl) molecules transferring excitation energy to PS IIα, PS IIβ and PS I. Spinach chloroplasts contained almost twice as many PS II reaction centers compared to PS I reaction centers. The number Nα of chlorophyll (Chl) molecules associated with PS IIα was 234, while Nβ = 100 and NPS I = 210. Thus, the functional photosynthetic unit size of PS II reaction centers was different from that of PS I reaction centers. The relative electron-transport capacity of PS II was significantly greater than that of PS I. Hence, under light-limiting green excitation when both Chl a and Chl b molecules are excited equally, the limiting factor in the overall electron-transfer reaction was the turnover of PS I. The Chl composition of PS I, PS IIα and PS IIβ was analyzed on the basis of a core Chl a reaction center complex component and a Chl ab-LHC component. There is a dissimilar Chl ab-LHC composition in the three photosystems with 77% of total Chl b associated with PS IIα only. The results indicate that PS IIα, located in the membrane of the grana partition region, is poised to receive excitation from a wider spectral window than PS IIβ and PS I." @default.
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- W2066330181 date "1983-09-01" @default.
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- W2066330181 title "Structural and functional organization of the photosystems in spinach chloroplasts. Antenna size, relative electron-transport capacity, and chlorophyll composition" @default.
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