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Plant and Cell Physiology, 1969, Vol. 10, No. 2 259-270
© 1969

Article

Effect of inhibitors of nucleic acid and protein synthesis on the reappearance of "light interruption rhythm" in a long-day duckweed, Lemna gibba G 3

HIDEAKI NAKASHIMA

Biological Institute, Nagoya University Nagoya, Japan

Effects of several inhibitors of DNA, RNA and protein synthesis on the reappearance of a once faded-out light interruption rhythm in a long-day duckweed, Lemna gibba G 3, were studied. The reappearance was not affected by inhibitors of RNA and protein synthesis; i.e., 2-thiouracil, 8-azaguanine, ethionine and chloramphenicol, but was suppressed by inhibitors of DNA synthesis; i. e., 5-fluorodeoxyuridine, 5-fluorouracil and mitomycin C only when these were applied during the light period for perturbation.

We concluded that synthesis of a new DNA species during the light period was required for the recurrence of this rhythm.

(Received September 25, 1968; )
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