THE LIGHT-DEPENDENT FORMATION OF NUCLEIC ACIDS IN CULTURES OF SYNCHRONIZED CHLORELLA
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概要
- 論文の詳細を見る
In an attempt to clarify the process of light-dependent nucleic acid formation in Chlorella pyrenoidosa and to correlate this event with the phenomenon of synchrony the following results were obtained and discussed : 1. In synchronized auto- and mixotrophic cultures increased light intensities cause an increased ratio of DNA and RNA (on a dry weight basis). In an achlorophyllous mutant a marked enhancement of RNA synthesis occurs but only a slight increase of DNA. It appears that the light dependent formation of NA in Chlorella is mainly induced by photosynthetically active light. However, RNA synthesis, and to some extent DNA synthesis, is stimulated by light most probably absorbed by carotenoids. 2. Comparison of the time course of DNA and RNA development during the life cycle in mixotrophic cultures to those reported for autotrophic cultures demonstrated that a marked change in the time of onset of DNA synthesis occurs although the burst of cell division, i.e., the visible effect of synchrony, happens at the same time. RNA is produced during the entire life cycle in both types of cultures: only the total amount differs. 3. The action spectrum for cell division in mixotrophic cultures of the normal strain compares, in the blue region, with the in vivo absorption spectrum of the achlorophyllous mutant. This evidence and the comparison of the NA formation under different wavelengths lead to the suggestion that RNA formation and induction of cell division might be connected.
- 日本植物生理学会の論文
著者
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Senger H.
Department Of Botany And Plant Pathology Oregon State University
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Bishop N.i.
Department Of Botany And Plant Pathology Oregon State University