Studies on chloroplast development in Chlamydomonas reinhardtii I. Effect of brief illumination on chlorophyll synthesis

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When dark grown cells of Chlamydomonas reinhardtii y-1 mutant were exposed to continuous light, an immediate transformation of small amounts of protochlorophyll(ide), which had been present in the dark grown cells, to chlorophyll was observed. After this, there was a slow accumulation of chlorophyll lasting for 2.5-3 hr before the start of exponential synthesis. Initial accumulation of chlorophyll was distinctly slower at a high light intensity (13,000 lux) than it was at. moderate intensities of light (2,000-5,000 lux). However, the exponential synthesis of chlorophyll started after the same 2.5-3 hr of illumination. A brief pre-illumination of cells followed by incubation in darkness was effective in promoting chlorophyll synthesis under subsequent continuous illumination at high, as well as moderate light intensities. Pretreatment alleviated retardation of the initial chlorophyll accumulation by light of high intensity. The promoting effect of pre-illumination on chlorophyll synthesis was sufficient, even when a light impulse as short as 10 sec was given. However, the effect was dependent on length of the dark period after the short pre-illumination. The full extent of this effect was observed when the dark period was about 2.5-3 hr long. Further dark incubation gradually decreased the effect. On the basis of these findings, it is assumed that a factor(s) responsible for promotion of chlorophyll (or chloroplast) synthesis in the process of greening of dark grown cells is produced during the dark period after a brief pre-illumination, and that the factor is turned over at a relatively fast rate. The possible nature of the presumed factor is discussed in relation to chloroplast development.
日本植物生理学会の論文

Studies on chloroplast development in Chlamydomonas reinhardtii I. Effect of brief illumination on chlorophyll synthesis

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