Diurnal rhythm of uridine incorporation into RNA regulated by two light-perceiving systems in a long-day duckweed, Lemna gibba G3
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A long-day duckweed, Lernna gibba G3, was found to be controlled by two light-perceiving systems; a system perceiving a prolonged, high-intensity white light and the phytochrome system, with respect to the incorporation of radioactive uridine into RNA. When the duckweed was exposed to short or long days, the uridine incorporating activity into RNA changed diurnally reaching its highest level at 18 hr and its lowest one at 6 hr after the beginning of a light period. The level of maximum activity rose in proportion to an increase in the length of the light period up to 12 hr or in light intensity up to 3000 ergs/cm^2.sec. The far-red light termination of the light period resulted in a decrease in uridine incorporation, the extent of which was constant irrespective of the length of the light period. The uridine incorporating activity changed diurnally when the duckweed was exposed to continuous light. The period length of the rhythm was circadian and was constant over a temperature range of 16゜ to 30℃.
- 日本植物生理学会の論文
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関連論文
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