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Plant and Cell Physiology, 1986, Vol. 27, No. 5 861-865
© 1986

Article

Effect of Phytochrome on the Uptake of Gibberellin by Protoplasts of Nicotiana glutinosa L.

L. Dale Keppler1 and Dan Mertz2

Division of Biological Sciences, University of Missouri Columbia 65211, U.S.A.

2 To whom reprint request should be addressed.

The effect of red light on gibberellin uptake by Nicotiana glutinosa L. protoplasts was determined. Five minutes of red light caused over a 50% inhibition of GA3 uptake within 2 minutes. Five minutes of far red light completely reversed the red light effect. The antagonistic effect of far red light indicates that gibberellin uptake is under phytochrome control.

The rapid inhibition of gibberellin uptake indicates that phytochrome regulates the permeability properties of the plasma membrane as an initial response and not the intracellular binding of gibberellin.

1Department of Plant Pathology, University of Missouri.

(Received October 28, 1985; Accepted April 23, 1986)
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