Chromatic Regulation of Photosystem Composition in the Photosynthetic System of Red and Blue-Green Algae

概要

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A chromatic adaptation in the photosynthetic quantum yield for the light mainly absorbed by chlorophyll a (Chl a light) first found by Yocum (1951) was studied with one red and three blue-green algal strains. When the cell~ were grown under a weak Chl a light, the quantum yield in all the strains increased. Comparison of photosystem (PS) compositions, including phycobilin (PBP) and Chl a antennae, reaction centers I and II, in the cells grown under the light mainly absorbed by PBP and Chl a revealed that changes in quantum yield could be attributed to changes in the ratio of PS I/II; PS I/ll becomes larger than I under PBP light but decreases to I in most cases under Chl a light. The change in the PS I/II ratio is due solely to the changes in the PS I population in the cell; PS II remains constant. These results are similar to the intensity-dependent response in PS composition. A common hypothesis for both the chromatic and intensity-induced regulation of PS composition was proposed based on the idea of balance between the electron flow from H_2O to NADP driven by PS I and II and the cyclic one driven by PS I.
日本植物生理学会の論文