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Plant and Cell Physiology, 1978, Vol. 19, No. 2 289-297
© 1978

Article

Participation of phytochrome in the light inhibition of malformin-induced abscission

Roy W. Curtis

Department of Botany and Plant Pathology, Purdue University W. Lafayette, Indiana 47907, U.S.A.

The ability of white light to inhibit malformin-induced abscission on cuttings of Phaseolus aureus involved a red-far red reversible phenomenon. Treatment with far red radiation prior to dark incubation enhanced abscission on both control and malformin-treated cuttings. The dark aging process, which enhances abscission on both control and malformin-treated cuttings, was inhibited by red radiation and was also far red reversible. The photoreceptor for light inhibition of malformin-induced abscission was located in the primary leaves. A role of phytochrome in the inhibition of abscission on control and malformin-treated cuttings is indicated.

(Received September 20, 1977; )
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