Syntheses of δ-aminolevulinic acid and chlorophyll during chloroplast formation in Chlorella protothecoides

概要

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Greening cells of Chlorella protothecoides were assayed for activity of the in vivo synthesis of ALA, which was markedly developed during light-induced greening. Effects of CH on the syntheses of ALA and chlorophyll were also examined. The results strongly suggested that a labile enzyme is involved in ALA synthesis, and that continuous formation of the enzyme is required for the greening of cells. However, the prompt suppression of chlorophyll synthesis when CH was added to rapidly greening cells was found to be attributable not to the blockage of ALA synthesis but to the suppression of some later process(es) in the course of chlorophyll synthesis, under the conditions used. The value of the Hill coefficient for the CH inhibition of chlorophyll synthesis as well as the CH concentration which caused 50% inhibition remained unaltered whether it was measured when the ALA synthesis activity was greatly inhibited by CH or when the activity was only slightly suppressed.
日本植物生理学会の論文