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Plant Physiology 42:95-98 (1967)
© 1967 American Society of Plant Biologists

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Articles

Inhibition of Flowering of Xanthium pensylvanicum Wallr. by Prolonged Irradiation with Far Red

Alberto L. Mancinelli1 and Robert J. Downs2

Plant Physiology Pioneering Research Laboratory, U.S.D.A., A.R.S., Beltsville, Maryland, Crops Research Division, Plant Industry Station, Beltsville, Maryland

Interrupting each long night with a prolonged period of far red radiant energy resulted in the inhibition of floral initiation in cocklebur. Irradiations inducing different relative levels of PFR from 1 to 2% to 80% had about the same effect under 4-hour photoperiods. The lower levels of PFR induced by continuous far red irradiation were not as effective as the higher levels induced by red under 8 and 12-hours photoperiods. The critical PFR level required to induce inhibition of flowering seems to increase with increasing photoperiods.

1 Present address: Department of Biological Sciences, Columbia University, New York, New York 10027.

2 Present address: School of Agriculture and Life Sciences. North Carolina State University, Raleigh, North Carolina 27607.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1967 by the American Society of Plant Biologists