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Plant and Cell Physiology, 1979, Vol. 20, No. 8 1531-1536
© 1979

Article

Spectral dependence of the critical photoperiod in the long-day duckweed, Lemna gibba G3

Yukito Oota1 and Toshiaki Hoshino

Biological Institute, Nagoya University Chikusa, Nagoya 464, Japan

Spectral dependence of the light sensitive L1- and L2-phases of the critical photoperiod of Lemna gibba G3 was examined by the min-LD method for wavelengths ranging from ca. 420 to 800 nm. The L1-phase had a sharp peak of sensitivity at 650–680 nm and a gentle slope of sensitivity ascending from 500 nm toward shorter wavelengths. The L2-phase showed remarkable sensitivity around 750 nm and in the blue-violet regions (≤500 nm). Red/far-red photoreversibility was confirmed for the LI-phase, but not for the L2-phase. The properties of the light receptors involved are discussed briefly.

1Present address: National Institute for Basic Biology, Myodaiji, Okazaki 444, Japan.

(Received May 14, 1979; )
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