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Plant and Cell Physiology, 1966, Vol. 7, No. 1 59-74
© 1966

Article

TWO LIGHT REACTIONS IN THE PHOTOPERIODIC CONTROL OF FLOWERING OF LEMNA PERPUSILLA AND L. GIBBA

YOJI ESASHI and YOSHIHARU ODA

Institute for Agricultural Research, Tohoku University Sendai

The effects of light quality on the photoperiodic control in the flowering of a SD duckweed, Lemna perpusilla strain 6746, and a LD duckweed, L. gibba strain G3, were investigated with special reference to the interaction between R and B or FR lights.

In the diurnal alternation of R or G light and dark periods, L. perpusilla responded as a SDP, but in that of B or FR light it was almost daylength-indifferent. On the other hand, L. gibba responded as a LDP under B, R or FR light, although the critical light length was altered by the light quality.

In the diurnal alternation of R and B or FR light periods containing no dark period, L. perpusilla flowered with the shortening of the optimal and critical R light lengths, compared with the plant exposed to that of R light and dark period. The flowering response of L. gibba to the R light length showed double peaks, that is, the first peak at the R duration less than 9 hours, and the second at the R duration longer than 9 hours. The first peak corresponds to the optimal R light length in L. perpusilla.

Under the CL with a mixture of R and B or FR lights, the flowering and frond production were influenced by the intensity ratio of two light given. In both plants, the optimal ratio of B to R or FR to R for the flowering was always greater than that for the frond production.

It is suggested that the B or FR light interacts with the R light in the photoperiodic process in the plants and this interaction between the R and B or FR lights should be of importance for obtaining a better understanding of photoperiodism.

(Received August 28, 1965; )
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W. S. Hillman
Photoperiodism in Lemna: Reversal of NightInterruption Depends on Color of the Main Photoperiod
Science, December 9, 1966; 154(3754): 1360 - 1362.
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