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Plant and Cell Physiology, 1973, Vol. 14, No. 5 893-899
© 1973

Article

Reversal of the dark inhibition of flowering in a long-day duckweed, Lemna gibba G3, by thymidine and related nucleosides

Hideaki Nakashima

Biological Institute, Nagoya University Nagoya, Japan

Effects of several nucleosides on flowering in Lemna gibba G3 inhibited by darkness inserted just before an inductive light period were investigated. Thymidine and deoxyuridine could reverse the inhibition, but deoxycytidine, cytidine, uridine, thymine and deoxyribose could not. Since interruption of die darkness with a brief light period was effective similarly to addition of thymidine and deoxyuridine, the light-stimulated step in thymidine biosynthesis is probably the reaction of deoxyuridine synthesis. Furthermore, maintenance of thymidine content is probably required for the progress of floral induction.

(Received March 29, 1973; )
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