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Plant and Cell Physiology, 1986, Vol. 27, No. 6 1147-1152
© 1986

Article

Site of Perception of the Far-Red Inhibition of Flowering in Pharbitis nil Choisy

P.H. Knapp, S. Sawhney1, Molly M. Grimmett and Daphne Vince-Prue

Glasshouse Crops Research Institute Worthing Road, Littlehampton, West Sussex, BN17 6LP, U.K.

The site of perception of the inhibition of flowering by far-red light (729 nm) was investigated in the short-day plant Pharbitis nil, using a specially designed optical fibre apparatus with interference filters. The cotyledon was found to be the primary site of perception and no inhibition was obtained when the apex alone was irradiated. However, when the apex and cotyledon were simultaneously irradiated there was a reduction in the number of terminal flower buds compared with the cotyledon alone. For whole plants, far-red light centred at 729 nm (10 nm bandwidth) was considerably more inhibitory than at 719 nm.

1Present address: Department of Biology, Guru Nanak Dev University, Amritsar—143005, Panjab, India.

(Received April 28, 1986; Accepted June 23, 1986)
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