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Plant and Cell Physiology, 1967, Vol. 8, No. 3 467-473
© 1967

Article

BLUE LIGHT, PHYTOCHROME AND THE FLOWERING OF LEMNA PERPUSILLA 67461

WILLIAM S. HILLMAN

Biology Department, Brookhaven National Laboratory Upton, New York 11973, U. S. A.

Lemna perpusilla 6746 was grown on HUTNER'S medium with sucrose under light schedules combining red, blue and far-red light. As shown earlier, brief red exposures added to a continuous blue schedule inhibit flowering although either schedule alone permits it; hence red and blue act together in establishing a long day (flower inhibiting) condition. However, the red exposure required to inhibit flowering is greater with high intensity than with low intensity continuous blue, suggesting in addition a blue-red antagonism. Blue light reverses the effects of a brief red exposure closing a blue or far-red main photoperiod, but it also reverses the effects of a brief far-red exposure closing a red photoperiod. Thus, blue can act either like red or like far-red, depending on the situation. All effects of blue light on the flowering of L. perpusilla 6746 are consistent with the notion that it establishes a Pfr level intermediate between those established by red and far-red light; the postulation of an additional photoreaction to explain the effects of blue seems unnecessary.

1Research carried out at Brookhaven National Laboratory under the auspices of the U. S. Atomic Energy Commission.

(Received June 27, 1967; )
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