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Plant and Cell Physiology, 1979, Vol. 20, No. 4 707-713
© 1979

Article

Effects of benzyladenine and light on changes in various RNA species in etiolated cucumber cotyledons

Isao Kinoshita, Kunio Katagiri and Hideo Tsuji

Laboratory for Plant Ecological Studies, Faculty of Science, Kyoto University Kyoto 606, Japan

All classes of RNA in etiolated cucumber cotyledons examined increased with benzyladenine (BA) treatment in the presence or absence of light. The effect of light in inducing an increase in cytoplasmic and plastid rRNA, especially in the latter, was pronounced in water controls. On the contrary, light had no stimulatory effect on the increase in BA-treated cotyledons. In BA-treated samples, cytoplasmic and plastid rRNA increased with the percentage of the latter remaining unchanged in both light and dark. Light induced a great increase in 4-5S RNA, especially in BA-treated samples. This increase accounted for about 90% of the increment in total RNA over the dark control in cotyledons treated with BA.

BA and light seem to share parts in mechanisms causing increases in cytoplasmic and plastid rRNA, but do not seem to be involved in a completely common mechanism.

(Received September 14, 1978; )
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